RECENT PUBLICATIONS ON FORAMINIFERA 2012 (3)

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RECENT PUBLICATIONS ON FORAMINIFERA | 2013 (1) | 2012 (6) | 2012 (5) | 2012 (4) | 2012 (3) | 2012 (2) | 2012 (1) | 2011 (5) | 2011 (4) | 2011 (3) | 2011 (2) | 2011 (1) | 2010

THE ECOLOGY AND BIOGEOGRAPHY OF Discospirina tenuissima IN THE ATLANTIC AND INDIAN OCEANS

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The large (≥1 cm diameter) miliolid foraminifera Discospirina tenuissima (Carpenter and Jeffries, 1870) is common at four sites (NW, NE, SW, SE), located on either side of the Mid-Atlantic Ridge to the north (54°N) and south (49°N) of the Charlie-Gibbs Fracture Zone. The white discoidal tests of this epifaunal species were visible in video surveys of flat and gently (10°) sloping, sediment-covered areas of seafloor (replicate 500-m-long transects, 1000 m2 surface area) obtained using the Remote Operated Vehicle Isis. Considerable variation was also evident between individual transects (0–2.25 ind m−2). The tests displayed no consistent dispersion pattern; both significantly random and clumped patterns were observed, in some cases within a single site. ...... They were particularly common at the SE site, where one or two abandoned rings indicated that some tests had moved distances of several centimetres across the seafloor. Most previous records of D. tenuissima are from well-oxygenated sites in the NE Atlantic. We provide the first records from the Indian Ocean. Here, this species occurs at bathyal depths in the northwest (1980 m) and northeast (938 m) Arabian Sea, where bottom-water oxygen concentrations are depressed.

(ABSTRACT)


Gooday, A.J., Alt, C.H.S., Jones, D.O.B., Shale, D., Marsden, K., Brasier, M.D., in press. The Ecology and Biogeography of Discospirina tenuissima (Foraminifera) in the Atlantic and Indian Oceans. Deep Sea Research II, doi:10.1016/j.dsr2.2012.05.001


EARLY STALL OF WEST ANTARCTIC ICE SHEET ADVANCE ON THE EASTERN ROSS SEA MIDDLE SHELF

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Marine geological and geophysical data suggest that the West Antarctic Ice Sheet (WAIS) deposited three thick seismically-resolvable units in the eastern Ross Sea since the Last Glacial Maximum (LGM) but the chronology of these grounding events is debated. Existing ice-retreat chronologies for the eastern Ross Sea are considered suspect because nearly all have been developed using radiocarbon dating of acid-insoluble organics (AIO) from bulk sediment. We used a new strategy to isolate in situ forams from diamict sediment deposited at the middle-shelf grounding-zone wedge (GZW) — a subaqueous ice-marginal landform previously interpreted to represent deposition during the third grounding event since the LGM advance to the shelf edge. Here we present a synthesis of our new radiocarbon dates of foram tests and AIO with previously published radiocarbon dates. ......

(ABSTRACT)


Bart, P.J., Cone, A.N., 2012. Early stall of West Antarctic Ice Sheet advance on the eastern Ross Sea middle shelf followed by retreat at 27,500 14C yr BP. Palaeogeography, Palaeoclimatology, Palaeoecology 335-336, 52-60.


MAGNITUDE AND TIMING OF EQUATORIAL ATLANTIC SURFACE WARMING DURING THE LAST GLACIAL BIPOLAR OSCILLATIONS

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We present core top and down core sample analyses of Mg/Ca in tests of planktonic foraminifer Globigerinoides ruber (variety pink) from the eastern Tropical-Equatorial Atlantic. Multivariate analysis of the core top data shows that Mg/Ca varies by 8 ± 2% and 1 ± 0.9% per unit sea surface temperature (SST) (°C) and salinity (psu) changes, respectively, indicating that temperature exerts the most dominant control on planktonic foraminiferal Mg/Ca variation. A centennially resolved record of Mg/Ca-based SST estimates from the Eastern Equatorial Atlantic (EEA) exhibits a close correlation between episodes of equatorial surface water warming, the onset of massive melt-water inputs into the North Atlantic (Heinrich events H3–H6), and rapid drop of air temperature over Greenland, indicating that the Eastern Equatorial Atlantic responded very sensitively to millennial-scale bipolar oscillations of the last glacial and marine isotope stage 3. ...... Our study emphasizes that changes in wind fields and wind-induced low latitude zonal surface currents were crucial in shaping the spatial heterogeneity and duration of Equatorial Atlantic surface water warmth.

(ABSTRACT)


Weldeab, S., 2012. Magnitude and timing of Equatorial Atlantic surface warming during the last glacial bipolar oscillations. Climate of the Past Discussion 8, 1737-1762.


SST FOR LEFT-COILING Neogloboquadrina POPULATIONS IN THE WESTERN MOST MEDITERRANEAN IN PLEISTOCENE-PLIOCENE

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Using the modern analog methodology applied to planktonic foraminifers, we analyze the relation between the frequency of the coiling type in Neogloboquadrina populations and the sea-surface temperatures (SST) during the middle Pleistocene and the Pleistocene-Pliocene transition in the Alboran Sea (westernmost Mediterranean), close to the Atlantic connection. The results reveal that the present-day positive correlation between the two variables (r = 0.649) is maintained even with a higher coefficient (r = 0.783) in the middle Pleistocene but falls slightly (r = 0.517) in the Pleistocene-Pliocene transition due mainly to a dispersal of the temperatures for the samples bearing predominantly left-coiling Neogloboquadrina. The temperature used as a reference for the coiling change resulted 5-6 °C above its North Atlantic present-day reciprocal, but these thermal differences could be caused by ...... these results in combination with those derived from the isotopic analyses (δ18O) in G. bulloides tests, suggest that during the Pliocene-Pleistocene transition two different populations of left-coiling Neogloboquadrina could have existed with different environmental requirements: one, derived from late Miocene-Pliocene (i.e., left-coiling N. acostaensis group), and another being the ancestor of the modern N. pachyderma (left-coiling). ...... (ABSTRACT)


Serrano, F., Guerra-Merchán, A., in press. Sea-surface temperature for left-coiling Neogloboquadrina populations inhabiting the westernmost Mediterranean in the middle Pleistocene and the Pleistocene-Pliocene transition. Geobios, doi:10.1016/j.geobios.2011.04.003


LATE MIOCENE PALAEOGEOGRAPHIC EVOLUTION OF THE ATLANTIC - MEDITERRANEAN SEAWAY

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The marine stratigraphic record of the Granada Basin (central Betic Cordillera, Spain) is composed of three Late Miocene genetic units deposited in different sea-level contexts (from base to top): Unit I (sea-level rise), Unit II (high sea-level), and Unit III (low sea-level). The latter mainly consists of evaporites precipitated in a shallow-basin setting. Biostratigraphic analyses based on planktonic foraminifera and calcareous nannoplankton indicate four late Tortonian bioevents (PF1-CN1, PF2, PF3, and PF4), which can be correlated with astronomically-dated events in other sections of the Mediterranean. ...... Comparisons with data from the other Betic basins indicate that the evaporitic phase of the Granada Basin (7.37-7.24 Ma) is not synchronous with those from the Lorca Basin (7.80 Ma) and the Fortuna Basin (7.6 Ma). In the Bajo Segura Basin (easternmost Betic Cordillera), no evaporite deposition occurred during the late Tortonian. The evaporitic unit of the Granada Basin (central Betics) records the late Tortonian restriction of the Betic seaway (the marine connection between the Atlantic and Mediterranean). The diachrony in the restriction of the Betic seaway is related to differing tectonic movements in the central and eastern sectors of the Betic Cordillera. (ABSTRACT)


Corbí, H., Lancis, C., Harcía-García, F., Pina, J.-A., Soria, J.M, Tent-Manclús, J.E., Viseras, C., in press. Updating the marine biostratigraphy of the Granada Basin (central Betic Cordillera). Insight for the Late Miocene palaeogeographic evolution of the Atlantic - Mediterranean seaway. Geobios, doi:10.1016/j.geobios.2011.10.006


Praeorbitolina/Palorbitolinoides ASSOCIATION: AN APTIAN BIOSTRATIGRAPHIC KEY-INTERVAL IN THE NEO-TETHYS

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The Praeorbitolina/Palorbitolinoides Association characterizes a Lower Cretaceous biostratigraphic interval, which is marked by the common occurrence of these two foraminiferal genera. The base of this interval is defined by the inception of Palorbitolinoides cf. orbiculata, whereas the top is marked by the disappearance of the genus Praeorbitolina. The Praeorbitolina/Palorbitolinoides Association is evident in the uppermost part of the Lower Aptian of the Apulian and Adriatic Carbonate Platforms, as well as of the eastern Arabian Plate, all located at the southern margin of the Neo-Tethys.

(ABSTRACT)


Cherchi, A., Schroeder, R., in press. The Praeorbitolina/Palorbitolinoides Association: an Aptian biostratigraphic key-interval at the southern margin of the Neo-Tethys. Cretceous Research, doi:10.1016/j.cretres.2012.02.018


THE EVOLUTIONARY ORIGIN OF THE GENUS Hantkenina

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A high-resolution study of the Tethyan Contessa Highway reference section (Gubbio, Italy) has produced a detailed, well-constrained and more complete pattern of the gradual evolutionary origin of the foraminiferal genus Hantkenina from Clavigerinella than hitherto shown. A nine-stage pattern is presented for this evolutionary lineage. The related time frame and duration are assessed using the astronomical calibration of the Contessa Highway record. The evolution of Clavigerinella caucasica to Hantkenina gohrbandti, the real ancestor of Hantkenina, leads in 333 kyr. The H. gohrbandti first appearance is dated at 45.564 Ma. Our findings show that during the middle Eocene, from 46 to 45.5 Ma and with a major pulse centered at 45.521 Ma deep-mesopelagic planktonic foraminifera may have developed different morphological modifications to tolerate temporary exceptionally stressful environmental conditions. These conditions are principally related to poorly oxygenated and usually food-poor waters. This suggests that sustained and expanded oxygen minimum zone conditions and associated enhanced eutrophication might have occurred during that time. (ABSTRACT)


Coccioni, R., Bancalà, G., in press. New insights into the pattern, timing, and duration of the evolutionary origin of the foraminiferal genus Hantkenina. Revue de Micropaléontologie, doi:10.1016/j.revmic.2012.03.002


PETM IN SHALLOW-MARINE SUCCESSIONS OF THE ADRIATIC CARBONATE PLATFORM

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The Paleocene-Eocene thermal maximum represents one of the most rapid and extreme warming events in the Cenozoic. Shallow-water stratigraphic sections from the Adriatic carbonate platform offer a rare opportunity to learn about the nature of Paleocene-Eocene thermal maximum and the effects on shallow-water ecosystems. We use carbon and oxygen isotope stratigraphy, in conjunction with detailed larger benthic foraminiferal biostratigraphy, to establish a high-resolution paleoclimatic record for the Paleocene-Eocene thermal maximum. A prominent negative excursion in δ13C curves of bulk-rock (∼1‰–3‰), matrix (∼4‰), and foraminifera (∼6‰) is interpreted as the carbon isotope excursion during the Paleocene-Eocene thermal maximum. The strongly 13C-depleted δ13C record of our shallow-marine carbonates compared to open-marine records could result from organic matter oxidation, suggesting intensified weathering, runoff, and organic matter flux. (ABSTRACT)


Zamagni, J., Mutti, M., Ballato, P., Košir, A., in press. The Paleocene–Eocene thermal maximum (PETM) in shallow-marine successions of the Adriatic carbonate platform (SW Slovenia). The Geological Society of America Bulletin, doi:10.1130/B30553.1


COASTAL SEDIMENTATION ASSOCIATED WITH THE TOHOKU TSUNAMI IN SOUTH KURIL ISLANDS, NW PACIFIC

Sediment deposited by the Tohoku tsunami of March 11, 2011 in the Southern Kurils (Kunashir, Shikotan, Zeleniy, Yuri, Tanfiliev islands) was radically different from sedimentation during local strong storms and from tsunamis with larger runup at the same location. Sediments from the 2011 Tohoku tsunami were surveyed in the field, immediately and 6 months after the event, and analyzed in the laboratory for sediment granulometry, benthos Foraminifa assemblages, and diatom algae. ...... The Foraminifera assemblages displayed features characteristic of benthic microfauna in the near-shore zone. Deep-sea diatoms recovered from tsunami deposits in two closely situated bays, namely Krabovaya and Otradnaya bays, had different requirements for environmental temperature, suggesting these different diatoms were brought to the bays by the tsunami wave entraining various water masses when skirting the island from the north and from the south. (ABSTRACT)


Rzzjigaeva, N.G., Ganzey, L.A., Grebennikova, T.A., Ivanova, E.D., Kharlamov, A.A., Kaistrenko, V.M., Shishkin, A.A., 2012. Coastal Sedimentation Associated with the Tohoku Tsunami of 11 March 2011 in South Kuril Islands, NW Pacific Ocean. Pure and Applied Geophysics, doi: 10.1007/s00024-012-0478-4


THE 1ST 14C ANALYSES FROM THE CENTRAL BALTIC SEA AND A PSV & Pb AGE MODEL

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Dating of sediment cores from the Baltic Sea has proven to be difficult due to uncertainties surrounding the 14C reservoir age and a scarcity of macrofossils suitable for dating. Here we present the results of multiple dating methods carried out on cores in the Gotland Deep area of the Baltic Sea. Particular emphasis is placed on the Littorina stage (8 ka ago to the present) of the Baltic Sea and possible changes in the 14C reservoir age of our dated samples. Three geochronological methods are used. Firstly, palaeomagnetic secular variations (PSV) are reconstructed, whereby ages are transferred to PSV features through comparison with varved lake sediment based PSV records. Secondly, lead (Pb) content and stable isotope analysis are used to identify past peaks in anthropogenic atmospheric Pb pollution. Lastly, 14C determinations were carried out on benthic foraminifera (Elphidium spec.) samples from the brackish Littorina stage of the Baltic Sea. ......
Highlights ► An independent Baltic Sea palaeomagnetic and Pb deposition age model is constructed. ► The palaeomagnetic method is assessed for various Baltic Sea sediment types. ► The first 14C analyses based on foraminifera for the central Baltic Sea are presented. ► An experimental gas ion source 14C analysis technique is used on low mass samples. ► 14C results are compared to the independent age model to infer reservoir age. (ABSTRACT)


Lougheed, B.C., Snowball, I., Moros, M., Kabel, K., Muscheler, R., Virtasalo, J.J., Wacker, L., 2012. Using an independent geochronology based on palaeomagnetic secular variation (PSV) and atmospheric Pb deposition to date Baltic Sea sediments and infer 14C reservoir age. Quaternary Science Reviews 42 , 43-58.


Sr ISOTOPE FRACTION OF PLANKTIC FORAMINIFERA AND INORGANIC CALCITE

We have investigated the strontium isotope fractionation (Δ88/86Srcarb-aq) between inorganic calcite and aqueous Sr2+ ions by precipitation experiments at a constant temperature of 25°C and precipitation rates (R) ranging from 102.3 to 104.2 μmol/m2/h. Strontium isotope ratios were measured using the 87Sr-84Sr double spike technique. It was found that strontium isotope fractionation in these calcites is strongly dependent on the precipitation rate: ...... The strontium isotopes of both foraminifera species are strongly fractionated (Δ88/86Srcarb-aq = -0.248 ± 0.005‰) when compared to published data of other major marine calcifiers. Applying the results from the inorganic precipitation experiments we find that the strong foraminiferal strontium isotope fractionation can be explained by calcification in a largely open system at high precipitation rates, comparable in magnitude to rates known from scleractinian reef corals. This interpretation is in good agreement with the kinetic calcification model for planktic foraminifera by Kisakürek et al. (GCA 75 (2011), 427), which was based on calcium isotopes and elemental Sr/Ca ratios.

(ABSTRACT)


Böhm, F., Eisenhauer, A., Tang, J., Dietzel, M., Krabbenhöft, A., Kisakürek, B., Horn, C., in press. Strontium isotope fractionation of planktic foraminifera and inorganic calcite.Geochimica et Cosmochimica Acta, doi:10.1016/j.gca.2012.04.038


PREFERENCE FOR SPECIFIC SEDIMENT FRACTIONS AND POLLUTION TOLERANCE OF BENTHIC FORAMINIFERA

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The coastal zone is the most variable area in the marine system in terms of environmental parameters and it is characterized by the highest granulometric variability. Considering that the distribution of benthic foraminifera is controlled by several biotic and abiotic factors, including sediment texture, this may be considered one of the main factors influencing foraminiferal assemblage composition. The role of sediment grain size on foraminiferal species distribution has been recognised by several studies, but only in a few cases it has been considered from a quantitative viewpoint. On this rationale, 137 sediment samples collected in three different Italian National Relevance Sites (Bagnoli, Baia and Augusta), affected by different type and degree of pollution, were analysed for grain size and benthic foraminifera. ......
Highlights ► We studied the preference of foraminiferal species for selected sediment fractions. ► A general preference of some species for specific sediment fractions was recognized. ► Sediment controls species distribution both in moderately and heavily polluted sites. ► Groups of species with different trophic needs showed preference for sand or mud. ► Species selecting fine sediment may be pollution tolerant due to adaptive strategy. (ABSTRACT)


Magno, M.C., Bergamin, L., Finoia, M.G., Pierfranceschi, G., Venti, F., Romano, E., in press. Correlation between textural characteristics of marine sediments and benthic foraminifera in highly anthropogenically-altered coastal areas. Marine Geology, doi: 10.1016/j.margeo.2012.04.002


PALAEOENVIRONMETAL EVOLUTION OF THE EAST CARPATHIAN FOREDEEP DURING THE LATE MIOCENE-EARLY PLIOCENE

The thick and continuous Mio-Pliocene sedimentary successions of the Focşani Depression in the Dacian Basin of Romania provide an excellent opportunity to study the palaeoecological changes in the Eastern Paratethys during the time when the Mediterranean and Black Sea experienced major sea level fluctuations related to the closure and re-opening of the marine connection to the Atlantic Ocean during the Messinian Salinity Crisis. These successions form the basis of high-resolution magneto-biostratigraphic studies that allow a detailed correlation to the standard Geological Time Scale. Here, we analyse the palaeoenvironmental evolution of the East Carpathian foredeep by integrating micro- and macropalaeontological data and sedimentological analyses. ......

(ABSTRACT)


Stoica, M., Lazar, I., Krijgsman, W., Vasiliev, I., Jipa, D., Floroiu, A., in press. Palaeoenvironmental evolution of the East Carpathian foredeep during the late Miocene – early Pliocene (Dacian Basin; Romania). Global and Planetary Change, doi:10.1016/j.gloplacha.2012.04.004


LATE QUATERNARY BIOSTRATIGRAPHY AND PALEOENVIRONMENTS IN THE BRAZILIAN BASIN

The foraminiferal (planktonic and benthic) and nannofosssil assemblages have been analyzed in the sediments of Core ACB-17-1447 taken from the South America continental slope north of the Rio Grande Rise piedmont during Cruise 17 of the R/V Akademik Sergey Vavilov. ...... The Quaternary age of the host sediments is evident from the occurrence of the planktonic foraminiferal index species Globorotalia truncatulinoides. Based on the nannofossil assemblages, the core sediments are attributed to the upper Pleistocene-Holocene. ...... The paleotemperature analysis of the planktonic foraminifers provided data for constructing the temperature curve that demonstrates two warm peaks. ...... Based on the abundances, taxonomic diversity, and proportions of the characteristic species of benthic foraminifers, the Core ASV-17-1447 section is divided into six intervals correlated with the marine isotopic stages defined by both the planktonic foraminifers and climatic changes evident from the variations in the bottom water circulation along the southwestern slope of the Brazilian Basin during the Late Quaternary.

(ABSTRACT)


Dmitrenko, O.B., Lukashina, N.P., Os'kina, N.S., 2012. Upper quaternary biostratigraphy and formation environments of the southwestern Atlantic Core ACB-17-1447 inferred from micropaleontological data. Oceanology 52 (2), 249-260.


INDIVIDUAL TO COMMUNITY-LEVEL FAUNAL RESPONSES TO EARLY MIOCENE GLOBAL WARMING

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Modern climate change has a strong potential to shift earth systems and biological communities into novel states that have no present-day analog, leaving ecologists with no observational basis to predict the likely biotic effects. Fossil records contain long time-series of past environmental changes outside the range of modern observation, which are vital for predicting future ecological responses, and are capable of (a) providing detailed information on rates of ecological change, (b) illuminating the environmental drivers of those changes, and (c) recording the effects of environmental change on individual physiological rates. Outcrops of Early Miocene Newport Member of the Astoria Formation (Oregon) provide one such time series. This record of benthic foraminiferal and molluscan community change from continental shelf depths spans a past interval environmental change (~20.3-16.7 mya) during which the region warmed 2.1–4.5°C, surface productivity and benthic organic carbon flux increased, and benthic oxygenation decreased, perhaps driven by intensified upwelling as on the modern Oregon coast. ......

(ABSTRACT)


Belanger, C.L. S., 2012. Individual to Community-Level Faunal Responses to Environmental Change from a Marine Fossil Record of Early Miocene Global Warming. PLoS ONE 7 (4): e36290. doi:10.1371/journal.pone.0036290


ISOTOPIC COMPOSITION OF LANGHIAN FORAMINIFERAL TESTS IN A MARGINAL PART OF THE CARPATHIAN FOREDEEP

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Foraminiferal assemblages from three locations of the Moravian part of the Carpathian Foredeep (Kralice, Premyslovice, Zidlochovice) have been studied in order to determine the paleoenvironmental conditions during the Early Badenian (Middle Miocene). Paleobiological characteristics (plankton/benthos-ratio, relative abundances of warm-water plankton species, five-chambered Globoturborotalita spp., Coccolithus pelagicus and high nutrient markers [benthos], test sizes and ranges of Globigerina sp. and cibicidoids, Benthic Foraminiferal Oxygen Index) were determined along with stable C and O isotope compositions. ...... Several types of near-shore paleoenvironment were distinguished using the theoretical models: (i) bay influenced by seasonal phytodetritus supply from the continent (Kralice); (ii) dynamic shore characterized by variable isotopic compositions probably due to mixing of indigenous, transported and reworked tests (Premyslovice); (iii) shore of alternating normal marine and continentally influenced environments (Zidlochovice). (ABSTRACT)


Holcova, K., Demeny, A., 2012. The oxygen and carbon isotopic composition of Langhian foraminiferal tests as a paleoecological proxy in a marginal part of the Carpathian Foredeep (Czech Republic). Geologica Carpathica 63 (2), 121-137.


A REAPPRAISAL OF THE VITAL EFFECT IN BENTHIC FORAMINIFERA ON Mg/Ca RATIOS

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...... The diversity in foraminiferal Mg/Ca-temperature calibrations suggests that there is also a biological control on this proxy. This study presents a new Mg/Ca-temperature calibration for the benthic foraminifer Bulimina marginata, based on cultures under a range of temperatures (4–14 ° C). ...... The inter-individual variability is quantified and split in three components, namely (1) an analytical error; (2) an environmental effect and (3) a vital effect. The effect of inter-individual variability on the accuracy of Mg/Ca-temperature calibrations is depending on the sensitivity of the used calibration and the number of individuals measured (Temperature uncertainty = (0.33 · N−0.50)/sensitivity). The less sensitive a calibration, the greater is the impact of inter-individual variability. This can partly be circumvented by measuring more individuals. Differences in sensitivity may depend on the stability of the environment in which the foraminifera live and the concurring ecological strategy. This study shows the link between inter-individual variability en sensitivity and their influence on the accuracy of \Mg/Ca-temperature calibrations. (ABSTRACT)


Wit, J.C., de Nooijer, L.J., Barras, C., Jorissen, F., Reichart, G.J., 2012. A reappraisal of the vital effect in benthic foraminifera on Mg/Ca ratios: species specific uncertainty relationships. Biogeosciences Discuss 9, 4947-4977.


ORIGIN OF DEEP WATER IN THE JAPAN SEA OVER THE LAST 145kyr

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We examined the paleoceanographic origin of the deep water in the Japan Sea over the last 145 kyr by using stable isotope data from foraminifera and paleontological data related to diatoms and planktonic foraminiferal coiling direction from core KT05-9p2 recovered from the Yamato Rise in the center of the Japan Sea. ......
Highlights ► We examined the paleoceanographic origin of the Japan Sea for the last 145 ka. ► The Tsushima and Oyashio currents have been the major source of water in the Japan Sea. ► The glacio-eustatsy has greatly influenced the oceanic regime of the Japan Sea. ► Seasonal cooling of surface water produced deep water at high sea-level stands. Baroclinic forcing induced the inflow of the Oyashio Current at low sea-level stands. (ABSTRACT)


Minoura, K., Akai, K., Nemoto, N., Tsukawaki, S., Nakamura, T., in press. Origin of deep water in the Japan Sea over the last 145kyr. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.04.011


THE BEDOULIAN (LOWER APTIAN) STRATOTYPE AT ROQUEFORT-LA BÉDOULE, SE FRANCE

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New drill cores from the Lower Aptian historical stratotype at Roquefort-La Bédoule (SE France) provide continuous high-resolution geochemical and isotope records which closely track the onset of OAE 1a in a subtropical intra-shelf basin (South Provençal Basin). The drilling operation recovered a total of 180 m of undisturbed sediments in three holes. The lowermost 67 m correspond to the Bedoulian (core LB1) and are here analyzed in high-resolution using geochemical proxies (stable carbon isotopes, stable oxygen isotopes, and carbonate content) and foraminiferal biostratigraphy. Pervasive bioturbation through core LB1 suggests mostly oxygenated bottom water conditions with transient dysoxic episodes, as shown by higher pyrite and glauconite concentrations within the marlstones. Unprecedented resolution over the negative δ13C excursion preceding OAE 1a (segment C3) reveals a characteristic double trough extending over ∼5.5 m in core LB1. This long-lasting negative excursion was possibly linked to multiple pulses of enhanced CO2 release to the atmosphere. Estimated sedimentation rates of 1.6–2 cm/kyr indicate that the negative δ13C excursion lasted >200 kyr, while the main positive carbon isotope shift (segment C4) had a duration of >300 kyr. Fluctuations in δ18O suggest transient episodes of climate warming and cooling at the northern margin of the Tethys or even on a more global scale prior to the onset of OAE 1a. (ABSTRACT)


Lorenzen, J., Kuhnt, W., Holbourn, A., Flögel, S., Moullade, M., Tronchetti, G., in press. A new sediment core from the Bedoulian (Lower Aptian) stratotype at Roquefort-La Bédoule, SE France. Cretaceous Research, doi:10.1016/j.cretres.2012.03.019


CAMPANIAN-MAASTRICHTIAN BIOSTRATIGRAPHY AND MAGNETOSTRATIGRAPHY AT ZUMAIA, SPAIN

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...... We present a new, high-resolution calibration of planktonic foraminiferal and calcareous nannofossil biostratigraphic datums, alongside new magnetostratigraphy. Six planktonic foraminiferal zones (Rugoglobigerina rotundata to Pseudoguembelina hariaensis) and nine nannofossil (sub)zones (UC15eTP? to UC20dTP) have been identified, encompassing the uppermost Campanian through uppermost Maastrichtian. ...... Differences between the planktonic foraminiferal and nannofossil datums at Zumaia and those from the Tercis boundary stratotype section (France) suggest that the biostratigraphic criteria used to identify the C/M boundary are problematic. We propose, therefore, two alternative, key biostratigraphic datums with which to determine the stratigraphic position of this boundary: the stratigraphic base occurrence datum (BO) of the planktonic foraminifer Pseudoguembelina palpebra and the top occurrence datum (TO) of the nannofossil Broinsonia parca subsp. constricta. The C31r/C31n magnetic polarity reversal, and the BOs of the planktonic foraminifer Racemiguembelina fructicosa and the nannofossil Lithraphidites quadratus are events that may prove useful in formally defining the lower/upper Maastrichtian boundary. (ABSTRACT)


Pérez-Rodrígeuz, I., Lees, J.A., Carrasoaña, J.C., Arz, J.A., Arenillas, I., in press. Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research, doi:10.1016/j.cretres.2012.03.011


THE CONTRIBUTION OF NATURAL VARIABILITY TO THE MODERN DECREASE IN FORAMINIFERAL δ18O

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We evaluate the contribution of natural variability to the modern decrease in foraminiferal δ18O by relying on a 2200-yr-long, high-resolution record of oxygen isotopic ratio from a Central Mediterranean sediment core. Pre-industrial values are used to train and test two sets of algorithms that are able to forecast the natural variability in δ18O over the last 150 yr. These algorithms are based on autoregressive models and neural networks, respectively; they are applied separately to each of the δ18O series' significant variability components, rather than to the complete series. ...... (ABSTRACT)


Alessio, S., Vivaldo, G., Taricco, C., Ghil, M., 2012. Natural variability and anthropogenic effects in a Central Mediterranean core. Climate of the Past 8, 831-839.


A METHOD OF EVALUATING PREHISTORIC GOUNDWATER ON COASTAL CARBONATE TERRAIN

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...... Subfossil benthic foraminifera in underwater caves are an overlooked method of evaluating prehistoric groundwater on coastal carbonate terrain because they provide a proxy for groundwater salinity and circulation. Twelve radiocarbon dates and foraminiferal paleoecology from two sediment cores obtained from Green Bay Cave (GBC), Bermuda, provide the first Holocene-scale groundwater reconstruction. First, the cave floor (− 20.7 mbsl) was flooded at ~ 7.7 ka as North Atlantic sea level and groundwater rose in near synchrony. Over the Holocene, groundwater conditions (salinity, circulation and degree of oxygenation) shifted a minimum of five times, primarily in response to sea-level rise. Most importantly, we provide evidence that a prehistoric meteoric lens collapsed at ~ 1.6 ka as sea-level rise breached a local sill and completely altered Bermudian coastal circulation. The complete loss, or retreat, of a groundwater mass associated with a minor sea-level change validates some numerical predictions that small changes in sea level can destabilize coastal groundwater resources, when coastal geometry and circulation are considered. (ABSTRACT)


van Hengstum, P.J., Scott, D.B., in press. Sea-level rise and coastal circulation controlled Holocene groundwater development in Bermuda and caused a meteoric lens to collapse 1600 years ago. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.02.007


PALEOENVIRONMENTAL RECONSTRUCTION FOR THE EARLY PLIOCENE MAGDALENA PALEODELTA, COLOMBIA

The Magdalena river transports one of the largest load of sediments per basin area in the world. Its delta position has changed several times over the Neogene. The Arroyo Piedras Section (169 m) in northern Colombia, contains part of the record of the Late Miocene to Early Pliocene evolution of the Magdalena paleodelta. ...... Based on lithofacies and benthic foraminifera content, the section was divided in three segments, and the upper segment was dated as Early Pliocene using planktonic foraminifera. The lower segment suggests siliciclastic sedimentation in a proximal prodelta/delta plain transitional environment. The intermediate segment suggests sedimentation in a lagoon and/or coastal swamp environment, whereas the upper segment is interpreted as the result of a transgression and subsequent deposition at the foreshore / upper shoreface environment, with a considerable decrease of terrigenous input. The decrease of sediment delivery to the delta produced by permanent El Niño- like conditions coupled with autocyclic processes could explain the transgressive pattern observed in the Arroyo de Piedras section during the Early Pliocene. (ABSTRACT)


Molinares, C.E., Martinez, J.I., Fiorini, F., Escobar, J., Jaramillo, C., in press. Paleoenvironmental reconstruction for the lower Pliocene Arroyo Piedras section (Tubará – Colombia): Implications for the Magdalena River – paleodelta’s dynamic. Journal of South American Earth Sciences, doi:10.1016/j.jsames.2012.04.007


MULTI-TECHNIQUE STUDY OF THE DISTRIBUTION OF AGGLUTINATED PARTICLES IN Mesorbitolina

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...... In this study, the test of Orbitolina d'Orbigny, 1850 (subgenus Mesorbitolina, Schroeder, 1962) from Aptian shallow-water carbonate deposits of southern Italy has been studied in detail. We combine petrographic techniques (optical microscope and SEM) with energy-dispersive x-ray spectrometry (EDS), Electron Probe Micro Analyser (EPMA), X-ray and Raman spectroscopy analyses. ......
Highlights ► High resolution analyses performed on the agglutinated shell of Mesorbitolina (larger foraminifera) from Lower Cretaceous of south Italy ► Agglutinated particles are made of carbonate and non-carbonate grains ► Distribution of non-carbonatic particles follows a specific patter across the test ► Mesorbitolina preferentially selected agglutinated grains by their shape ► Observations in a regional scale indicate that the observed features are generic (ABSTRACT)


Frijia, G., Di Lucia, M., Vicedo, V., Gunter, C., Ziemann, M.A., Mutti, M., in press. An extraordinary single-celled architect: A multi-technique study of the agglutinated shell of the larger foraminifer Mesorbitolina from the Lower Cretaceous of southern Italy. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.04.002


NEW ECOSTRATIGRAPHIC TOOL WITH POTENTIAL FOR DETECTING PALAEOENVIRONMENTAL CHANGE

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The percent carrying capacity Kp is the equilibrium population in percentage terms of a species that an area can support while adequately meeting the needs of every individual. ...... Points of change from one value of Kp to another in a stratigraphic section mark regime shifts and have potential for ecostratigraphic correlation. Within the Upper Quaternary of ODP Hole 1006A they apparently reflect an increase in the organic matter flux in the uppermost part of the section. The method described here can be applied to any species in any taxon for which percentage data are available. For those in the hydrocarbon industry it should prove especially useful for detailed studies of intervals of economic interest. (ABSTRACT)


Wilson, B., in press. Percentage carrying capacity in fossil successions: A new ecostratigraphic tool with potential for detecting palaeoenvironmental change illustrated using bathyal benthic foraminifera in the Late Quaternary of ODP Hole 1006A, Santaren Channel. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.04.008


THRESHOLD OF CARBONATE SATURATION STATE DETERMINED BY CO2 CONTROL EXPERIMENT

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...... Recent reports demonstrate nocturnal carbonate dissolution of reefs, despite a Ωa (aragonite saturation state) value of >1. This is probably related to the dissolution of reef carbonate (Mg-calcite), which is more soluble than aragonite. However, the threshold of Ω for the dissolution of natural sediments has not been clearly determined. We designed an experimental dissolution system with conditions mimicking those of a natural coral reef, and measured the dissolution rates of aragonite in corals, and of Mg-calcite excreted by other marine organisms, under conditions of Ωa > 1, with controlled seawater pCO2. The experimental data show that dissolution of bulk carbonate sediments sampled from a coral reef occurs at Ωa values of 3.7 to 3.8. Mg-calcite derived from foraminifera and coralline algae dissolves at Ωa values between 3.0 and 3.2, and coralline aragonite starts to dissolve when Ωa = 1.0. We show that nocturnal carbonate dissolution of coral reefs occurs mainly by the dissolution of foraminiferans and coralline algae in reef sediments.

(ABSTRACT)


Yamamoto, S., Kayanne, H., Terai, M., Watanabe, A., Kato, K., Negishi, A., Nozaki, K., 2012. Threshold of carbonate saturation state determined by CO2 control experiment. Biogeosciences 9, 1441-1450.


STABLE-ISOTOPE STRATIGRAPHY OF THE PLIOCENE-PLEISTOCENE CLIMATE TRANSITION IN THE NORTH PACIFIC

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From Ocean Drilling Program (ODP) Site 1208 on Shatsky Rise below the Kuroshio Current Extension, we present the North Pacific's first orbital-scale benthic-foraminiferal δ18O and δ13C time series to span the Pliocene–Pleistocene climate transition. Excellent agreement between the Site 1208 δ18O record and the global δ18O stack of Lisiecki and Raymo (2005) provides orbital-scale age control and confirms continuous stratigraphy from 3.7 to 1.8 Ma at the single-hole site. Cross-spectral analysis of the δ18O and δ13C time series reveals that these are coherent to 80% confidence at the 41-kyr obliquity band prior to 3.3 Ma (glacial isotope stage M2) and increase to the 95% level thereafter. ...... Firm establishment of orbital-scale age control on the stratigraphically complete Site 1208 section now provides a platform for high-resolution paleoceanographic reconstruction of the relatively understudied North Pacific. (ABSTRACT)


Venti, N.L., Billups, K., in press. Stable-isotope stratigraphy of the Pliocene–Pleistocene climate transition in the northwestern subtropical Pacific. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.02.001


EARLY HOLOCENE LARGE-SCALE MELTWATER DISCHARGE FROM GREENLAND

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Records of foraminiferal assemblages combined with lithological properties (grain size, magnetic parameters and XRF data) of marine sediment cores from West Greenland coastal waters and the adjacent Labrador Sea document widespread early Holocene meltwater discharge. This discharge is concluded to originate from large-scale melting of the Greenland Ice Sheet (GIS) having started prior to 8,600 cal. yr BP and ended at about 7,700-7,500 cal. yr BP, when the GIS margin had withdrawn from the fjords and become mainly land-based. ...... The oceanic regime off West Greenland prior to ~ 7,800 cal. yr BP was thus characterised by the presence of a permanent and widespread meltwater surface layer, presumably preventing deep convection in this region. Apart from indications of a slight decrease in meltwater discharge by the benthic foraminiferal fauna data, neither of the records shows any clear signal of a regionally important 8.2 ka event. (ABSTRACT)


Seidenkrantz, M.-S., Ebbensen, H., Aagaard-Sørensen, S., Moros, M., Lloyd, J.M., Olsen, J., Knudsen, M.F., Kuijpers, A., in press. Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters. Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.04.006


RESPONSE OF SHELF ECOSYSTEMS TO AN EARLY HOLOCENE HUMID PHASE

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Benthic foraminiferal data as well as stable oxygen and carbon isotope records of different planktonic and benthic foraminifera from a shelf sediment core off southwest Mallorca document major sedimentological, hydrological and trophic changes during the Holocene. The Holocene relative sea-level rise resulted in the progradation of different sediment facies types characterized by specific benthic foraminiferal assemblages. This succession reflects the evolution from an unstable shelf ecosystem with high-energy conditions at the sea-floor in the earlier Holocene to a more stable shelf ecosystem in the middle and late Holocene. Between approximately 10.3 and 5.5 kyr BP, low δ13C values of the surface dweller Globigerinoides ruber (white) and high difference in δ13C values between the epifaunal Cibicides lobatulus and the infaunal Bulimina aculeata document enhanced input of nutrients in surface waters and high remineralisation rates at the sea floor. The trophic change is associated with a change in sediment facies and can be attributed to higher precipitation and consequently, higher nutrient supply via riverine runoff from the island, mainly during the late summer/early fall season. This early Holocene humid interval is nearly contemporaneous to the formation of sapropel S1 in the eastern Mediterranean Sea and the African Humid Period. (ABSTRACT)


Milker, Y., Schmiedl, G., Betzler, C., Andersen, N., Theodor, M., in press. Response of Mallorca Shelf ecosystems to an early Holocene humid phase. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.04.001


FAUNAL RESPONSE TO RAPID CHANGES OF THE RIVER INFLUENCE, RHÔNE PRODELTA

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In the context of the French research project CHACCRA (Climate and Human-induced Alterations in Carbon Cycling at the River-seA connection), living (rose Bengal-stained) benthic foraminifera were investigated at two stations (24 and 67 m depth) in the Rhône prodelta (NW Mediterranean, Gulf of Lions). The aim of this study was to precise the response of benthic foraminiferal faunas to temporal changes of the Rhône River inputs (e.g. organic and terrigeneous material). Each site was sampled in April 2007, September 2007, May 2008 and December 2008, permitting to observe foraminiferal faunas of the 63–150 and >150 μm size fractions under a wide range of environmental conditions. Obvious variations in foraminiferal faunal composition were observed during the four investigated periods at the shallowest Station A located in the close vicinity of the Rhône River mouth. ...... This study put into evidence the extremely rapid response of benthic foraminiferal faunas to strong variations in environmental conditions mostly induced by the Rhône dynamics. (ABSTRACT)


Goineau, A., Fontanier, C., Jorissen, F., Buscail, R., Kerhervé, P., Cathalot, C., Pruski, A.M., Lantoine, F., Bourgeois, S., Metzger, E., Legrand, E., Rabouille, C., 2012. Temporal variability of live (stained) benthic foraminiferal faunas in a river-dominated shelf – Faunal response to rapid changes of the river influence (Rhône prodelta, NW Mediterranean). Biogeosciences 9, 1367-1388.


SEASONAL AND INTERANNUAL CHANGES OF PLANKTIC FORAMINIFERAL FLUXES IN THE GULF OF LIONS

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In order to investigate the seasonal and interannual variability of planktic foraminifer fluxes in the NW Mediterranean, 266 samples from two 12-year-long sediment traps were analyzed. Two mooring lines were deployed at the east (Station Planier) and the west (Station Lacaze Duthiers) of the Gulf of Lions. The moorings were deployed at a water depth of around 1000 m and were equipped with sediment traps at 500 m above bottom (mab). In addition, an array of 13 core-tops recovered from different key areas of the Gulf of Lions is described. ......
Highlights ► Planktic foraminiferal flux was analyzed in the NW Mediterranean over a 12-yr period. ► Most foraminiferal shells are exported during the winter-spring transition. ► The highest fluxes are recorded in the station affected by the Rhone plume. ► The closest analogs are the core tops located nearby the sediment traps. (ABSTRACT)


Rigual-Hernández, A.S., Sierro, F.J., Bárcena, M.A., Flores, J.A., Heussner, S., in press. Seasonal and interannual changes of planktic foraminiferal fluxes in the Gulf of Lions (NW Mediterranean) and their implications for paleoceanographic studies: Two 12-year sediment trap records. Deep Sea Research I, doi:10.1016/j.dsr.2012.03.011.


CRITERIA TO MONITOR ECOLOGICAL QUALITY STATUS (EcoQS) USING BENTHIC FORAMINIFERA

This study defines criteria for the use of benthic foraminifera (protists) as a quick and efficient bio-monitoring tool to implement marine legislation. Various sampling and preparation procedures are investigated in an attempt to find the optimal methodology for environmental monitoring using soft-sediment foraminifera with the objective of assessing ecological quality status (EcoQS). Twenty-seven sampling stations in silled basins along the Norwegian Skagerrak coast, NE North Sea, are investigated for environmental parameters and living (stained, including soft-shelled forms) and dead benthic foraminifera. ......
Highlights ► We set criteria to monitor Ecological Quality Status (EcoQS) using benthic foraminifera. ► The exponential bias-corrected Shannon diversity index is used. ► Methodological recommendations applicable in environmental monitoring are tested. ► Foraminiferal diversity correlates with bottom-water dissolved oxygen concentration. ► Benthic foraminiferal diversity can efficiently assess EcoQS in marine waters. (ABSTRACT)


Bouchet, V.M.P., Alve, E., Rygg, B., Telford, R.J., 2012. Benthic foraminifera provide a promising tool for ecological quality assessment of marine waters. Ecological Indicators 23, 66-75.


EFFECT OF OCEAN ACIDIFICATION AND TEMPERATURE INCREASE ON Neogloboquadrina pachyderma

The present study investigated the effects of ocean acidification and temperature increase on Neogloboquadrina pachyderma (sinistral), the dominant planktonic foraminifer in the Arctic Ocean. Due to the naturally low concentration of CO32− in the Arctic, this foraminifer could be particularly sensitive to the forecast changes in seawater carbonate chemistry. To assess potential responses to ocean acidification and climate change, perturbation experiments were performed on juvenile and adult specimens by manipulating seawater to mimic the present-day carbon dioxide level and a future ocean acidification scenario (end of the century) under controlled (in situ) and elevated temperatures (1 and 4 °C, respectively). ...... (ABSTRACT)


Manno, C., Morata, N., Bellerby, R., in press. Effect of ocean acidification and temperature increase on the planktonic foraminifer Neogloboquadrina pachyderma (sinistral). Polar Biology, doi:10.1007/s00300-012-1174-7.


EARLY PALEOGENE GLOBAL DIVERSITY PATTERNS OF LARGE BENTHIC FORAMINIFERA

Large benthic foraminifera (LBF) were major contributors to many Paleogene carbonate platforms around the world. These photosymbiotic foraminifera lived in warm, oligotrophic, shallow waters within the photic zone. Such Paleogene families as the nummulitids, alveolinids, and orthophragminids rose to prominence in the late Paleocene, thrived in the early and middle Eocene, and declined in the late Eocene and Oligocene. Diversity data from these three families were studied to understand better the controls on the rise of Paleogene LBFs. Analyzed data included total diversity (total number of species per biozone), number of first occurrences per biozone, and number of last occurrences per biozone. Results indicate that there were four intervals of increased total diversity, increased first occurrence, and increased last occurrence for all three families studied. ...... (ABSTRACT)


Whidden, K.J., Jones, R.W., 2012. Correlation of Early Paleogene global diversity patterns of large benthic foraminifera with Paleocene and Eocene climatic events. Palaios 27 (4), 235-251.


ARRIVAL AND EXPANSION OF INVASIVE FORAMINFIERA IN PADILLA BAY, WASHINGTON

Trochammina hadai Uchio, a benthic foraminifera native to Japanese estuaries, was first identified as an invasive in 1995 in San Francisco Bay and later in 16 other west coast estuaries. To investigate the timing of the arrival and expansion of this invasive species in Padilla Bay, Washington, we analyzed the distribution of foraminifera in two surface samples collected in 1971, in nine surface samples collected by Scott in 1972–1973, as well as in two cores (Padilla Flats 3 and Padilla V1/V2) obtained in 2004. ...... based on T. hadai's first appearance occurring stratigraphically well above sedimentological changes in the cores that reflect deposition of sediments in the bay due to previous diversions of the Skagit River, and its dominance in the early 1970s surface samples, we conclude that the species arrived in Padilla Bay somewhere between the late 1800s and 1971. Trochammina hadai may have been introduced into the bay in the 1930s when oyster culturing began there or, at a minimum, ten years prior to its appearance in San Francisco Bay. (ABSTRACT)


McGann, M., Grossman, E.E., Takesue, R.K., Penttila, D., Walsh, J.P., Corbett, R., 2012. Arrival and Expansion of the Invasive Foraminifera Trochammina hadai Uchio in Padilla Bay, Washington. Northwest Science 86 (1), 9-26.


RECORDS OF SEDIMENTARY DYNAMICS IN THE CONTINENTAL SHELF AND UPPER SLOPE, PORTUGAL

The sedimentary unconsolidated cover of the Aveiro–Espinho continental shelf and upper slope (NW Portugal) records a complex interplay of processes including wave energy and currents, fluvial input, sediment transport alongshore and cross-shelf, geological and oceanographic processes and sediment sources and sinks. In order to study this record, a set of surface sediment samples was studied. Sediment grain size and composition, as well as the mineralogical composition (by XRD) of the fine (< 63 μm) and clay (< 2 μm) fractions and benthic microfaunal (foraminifera) data were analysed. Cluster analysis applied to the sedimentological data (grain size, sediment composition and mineralogy) allowed the establishment of three main zones corresponding to the: inner-, mid- and outer-shelf/upper slope. ...... (ABSTRACT)


Martins, V., Abrantes, I., Grangeia, C., Martins, P., Nagai, R., Sousa, S.H.M., Laut, L.L.M., Dias, J.M.A., Dias, J.M., da Silva, E.F., Rocha, F., 2012. Records of sedimentary dynamics in the continental shelf and upper slope between Aveiro–Espinho (N Portugal). Journal of Marine Systems 96–97, 48-60.


MIDDLE MIOCENE FORAMINIFERA OF THE NOWY SĄCZ BASIN, POLISH OUTER CARPATHIANS

Foraminifera from newly exposed outcrop sections located in a Middle Miocene piggyback basin of the Outer Carpathians Nowy Sącz Basin indicate an environment of normal saline waters on the inner shelf and a temperature not lower than 18˚C. The area was ideal for the proliferation of: Miliolina spp., Elphidium crispum, Ammonia beccarii and Pararotalia. The habitat below the sediment surface was not colonised by foraminifera. Planktonic foraminifera are absent. The age of the population studied is referred based on the climate-related data, to the Orbulina suturalis Zone of the Miocene Climate Optimum. (ABSTRACT)


Gonera, M., 2012. Palaeoecology of the middle Miocene foraminifera of the Nowy Sącz Basin (Polish Outer Carpathians). Geological Quaterly 56 (1), 000-000.


PRECESSION FORCING OF PRODUCTIVITY OFF COSTA RICA DURING THE LAST GLACIAL CYCLE

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We present a new multi-proxy reconstruction of sea-surface properties spanning the last 140 ka in the IMAGES Core MD02-2529 located in the eastern tropical Pacific Ocean off Costa Rica. Spectral analysis of the records allowed us to examine the ecological imprints of orbital changes on planktic foraminiferal and coccolithophore assemblages and on the pattern of primary production in the Eastern Equatorial Pacific, north of the Equatorial upwelling. Independent productivity reconstructions based on phyto- and zooplankton assemblages show a coherent pattern dominated by orbital precession, which appears to have control productivity changes recorded in the studied core over the last glacial–interglacial cycle. ......
Highlights ► Precession control of plankton assemblages and bioproductivity over the last glacial cycle. ► Atmospheric forcing of bioproductivity changes via the enlargement of Costa Rica Dome. ► Conspicuous changes in planktic assemblages over terminations. ► Amplification of precession forcing by the ocean tunnelling at terminations. (ABSTRACT)


Ivanova, E.V., Beaufort, L., Vidal, L., Kucera, M., 2012. Precession forcing of productivity in the Eastern Equatorial Pacific during the last glacial cycle. Quaternary Science Reviews 40, 64-77.


OFFSHORE DEPOSITIONAL SEQUENCE OF 2004 TSUNAMI FROM SE INDIA

Offshore sediment characteristics of the 2004 tsunami were identified from a shallow core collected from the Chennai Coast, India. The depositional sequence clearly distinguishes four different processes: mixed facies (post-tsunami): 0–8 cm; tsunami return flow facies (TRFF): 8–20 cm; tsunami landward flow facies: 20–44 cm; and pre-tsunami facies: 44–64 cm, which all took place during and after the tsunami event. The coarse-grained nature and higher carbonate in the TRFF indicate that considerable sediment load was transported from the beach/land area to the offshore region during the return flow of tsunami waves. The relatively greater abundance of benthic foraminiferal species in the core sample suggests that the taxa were transported from deeper regions of the inner shelf regions of Bay of Bengal region. ...... (ABSTRACT)


Jonathan, M.P., Srinivasalu, S., Thangadurai, N., Rajeshwara-Rao, N., Ram-Mohan, V., Narmatha, T., in press. Offshore depositional sequence of 2004 tsunami from Chennai, SE coast of India. Natural Hazards, doi: 10.1007/s11069-012-0141-5


CORAL REEF ASSESSMENT USING SEDIMENTARY GEOCHEMISTRY AND FORAMINIFERAL ASSEMBLAGES

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The health of the coral ecosystem at Abrolhos was evaluated using foraminifers and geochemistry. A total of 54 bottom sediment samples were collected for foraminifers, and 18 samples were collected for geochemistry by scuba divers at nine stations from different depth domains (A: 1 m < depth ≤ 10 m; B: 10 m < depth ≤ 15 m, and C: 15 < depth ≤ 25 m) in January and July 2005. Transparency, water temperature, salinity, and dissolved oxygen were measured in situ near the sea bed. The sediment was analyzed for total organic carbon and nitrogen, carbonate content, phosphorus, mineralogy, and grain size. Foraminifers were identified to 136 genera and sorted into functional groups for FORAM index (FI). ......
Highlights ► Sedimentological and geochemical factors influence foraminifer distribution in a unique reef environment. ► The FORAM Index is validated for Abrolhos, in the Southwestern Atlantic, yet another reef environment, albeit some adjustments are suggested. ► Southwestern Atlantic local hydrodynamics influence foraminifera distribution in Abrolhos. (ABSTRACT)


Oliveira-Silva, P., Barbosa, C.F., de Almeida, C.M., Seoane, J.C.S., Cordeiro, R.C., Turcq, B.J., Soares-Gomes, A., in press. Sedimentary geochemistry and foraminiferal assemblages in coral reef assessment of Abrolhos, Southwest Atlantic. Marine Micropaleontology, doi:10.1016/j.marmicro.2012.03.005


JURASSIC FORAMINIFERAL DIVERSITY, BATHYMETRY AND PALEOENVIRONMENT OF THE JAISALMER BASIN, WESTERN INDIA

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This contribution presents an ammonite age constrained benthic foraminiferal dataset based on a study of 77 samples spanning from Bajocian to Early Tithonian from Jaisalmer (Western India). Species distribution and diversity are documented and changes therein are interpreted in terms of inferred bathymetry, shifts in sea level and paleoenvironment. The similarity and dissimilarity of benthic foraminiferal species from the adjoining Kachchh Basin (Western India) is also discussed. Results indicate that at Jaisalmer, sea level influenced facies deposition and both in turn, in a shallow marginal epicontinental setting, governed the distribution of benthic foraminifera. Further, the observed diversity patterns recognized bed-by-bed are governed by local conditions of the basin but at the stage- and family-levels, are influenced by global eustasy. The strong species dissimilarity observed between adjacent Jaisalmer and Kachchh basins and of increasing similarity at the family-level is most likely a reflection of large-scale changes in global eustasy. (ABSTRACT)


Garg, R., Jain, S., 2012. Jurassic benthic foraminiferal diversity, bathymetry and paleoenvironment of the Jaisalmer Basin (Western India). Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 263 (3), 227-260.


POSSIBLE EFFECTS OF GLOBAL ENVIRONMENTAL CHANGES ON ANTARCTIC BENTHOS

Because of the unique conditions that exist around the Antarctic continent, Southern Ocean (SO) ecosystems are very susceptible to the growing impact of global climate change and other anthropogenic influences. Consequently, there is an urgent need to understand how SO marine life will cope with expected future changes in the environment. Studies of Antarctic organisms have shown that individual species and higher taxa display different degrees of sensitivity to environmental shifts, making it difficult to predict overall community or ecosystem responses. This emphasizes the need for an improved understanding of the Antarctic benthic ecosystem response to global climate change using a multitaxon approach with consideration of different levels of biological organization. Here, we provide a synthesis of the ability of five important Antarctic benthic taxa (Foraminifera, Nematoda, Amphipoda, Isopoda, and Echinoidea) to cope with changes in the environment (temperature, pH, ice cover, ice scouring, food quantity, and quality) that are linked to climatic changes. ...... (ABSTRACT)


Ingels, J., Vanreusel, A., Brandt, A., Catarino, A.I., David, B., De Ridder, C., Dubois, P., Gooday, A.J., Martin, P., Pasotti, F., Robert, H., 2012. Possible effects of global environmental changes on Antarctic benthos: a synthesis across five major taxa. Ecology and Evolution 2 (2), 453-485.


DEGLACIAL TO POSTGLACIAL MARINE ENVIRONMENTS OF CANADIAN ARCTIC ARCHIPELAGO

Core 86027-144 (74°15.56′N, 91°14.21′W) represents a rare, continuous record of Late Pleistocene to Holocene sediments from High Arctic Canada extending from the end of the Last Glaciation. Based on microfossils (dinocysts, non-pollen palynomorphs, benthic and planktonic foraminifera), foraminiferal δ18O and δ13C, and sedimentology, seven palaeoenvironmental zones were identified. ...... A transitional period (Zone V; 7.8–6.7 cal. ka BP) of rapid environmental change fluctuating on a scale not observed today is marked by increasing sea-ice and reduced oceanic influence. This probably signals the exclusion of deeper Atlantic water owing to the glacio-isostatic shallowing of inter-island sills, coupled with generally cooling climate. Conditions analogous to those at present, with increased sea-ice and modern microfossil assemblages, commence at c. 6.7 cal. ka BP (zones VI–VII). Although climate ultimately forces long-term environmental trends, core 86027-144 data imply that regional dynamics, especially changes in sea-level, exert a significant control on marine conditions throughout the Canadian Arctic Archipelago. (ABSTRACT)


Pieńkowski, A.J., England, J.H., Furze, M.F.A., Marret, F., Eynaud, F., Vilks, G., Maclean, B., Blasco, S., Scourse, J.D., 2012. The deglacial to postglacial marine environments of SEBarrow Strait, Canadian Arctic Archipelago. BOREAS 41 (2), 141-179.


ASTRONOMICAL CALIBRATION OF THE UPPER CAMPANIAN-MAASTRICHTIAN IN THE INDIAN OCEAN

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An integrated framework of magnetostratigraphy, calcareous microfossil bio-events, cyclostratigraphy and δ13C stratigraphy is established for the upper Campanian–Maastrichtian of ODP Hole 762C (Exmouth Plateau, Northwestern Australian margin). Bulk-carbonate δ13C events and nannofossil bio-events have been recorded and plotted against magnetostratigraphy, and provided absolute ages using the results of the cyclostratigraphic study and the recent astronomical calibration of the Maastrichtian. Thirteen carbon-isotope events and 40 nannofossil bio-events are recognized and calibrated with cyclostratigraphy, as well as 14 previously published foraminifer events, thus constituting a solid basis for large-scale correlations. ......
Highlights ► Upper Campanian-Maastrichtian chronostratigraphic framework for the Indian Ocean► Astronomical calibration of plankton biostratigraphy and δ13C stratigraphy ► Correlation of this scheme to other reference sections is shown ► Precise age of 72.15 ± 0.05 Ma estimated for the Campanian/Maastrichtian boundary (CMB) ► CMB at the GSSP is ~ 800 kyr younger than CMB previously defined in the Boreal realm (ABSTRACT)


Thibault, N., Hussuon, D., Harlou, R., Gardin, S., Galbrun, B., Huret, E., Minoletti, F., in press. Astronomical calibration of upper Campanian–Maastrichtian carbon isotope events and calcareous plankton biostratigraphy in the Indian Ocean (ODP Hole 762C): Implication for the age of the Campanian–Maastrichtian boundary. Palaeogeography, Palaeoclimatology, Palaeoecology, 10.1016/j.palaeo.2012.03.027


OXYGEN DEPLETION IN THE PEARL RIVER ESTUARY, SOUTH CHINA

We examined a suite of geochemical and microfaunal indicators in 210Pb-dated sediment cores from the Pearl River Estuary, South China, to determine the historical course of oxygen conditions. The results revealed a substantial increase in nutrient elements and primary production in the sediment over the last 3 decades, which could be interpreted as a recent increase in the extent of eutrophic condition in the Pearl River Estuary. Furthermore, total foraminifers decreased abruptly in abundance while the species Ammonia beccarii, which is tolerant of low-oxygen conditions and high organic fluxes, showed a marked increase in relative abundance after the 1970s. These faunal changes implied that significant deterioration had occurred in the bottom water oxygen conditions since the late 1970s. This degradation could be caused by the increased nutrient and organic loading to the estuarine system, which is likely related to the rapid urbanization and industrial development in the Pearl River Delta during this period. (ABSTRACT)


Ye, F., Huang, X., Zhang, X., Zhang, D., Zeng, Y., Tian, L., in press. Recent oxygen depletion in the Pearl River Estuary, South China: geochemical and microfaunal evidence. Journal of Oceanology, doi:10.1007/s10872-012-0104-1


MIDDLE-UPPER MIOCENE STRATIGRAPHY OF THE TAMAN PENINSULA, SW RUSSIA

The stratigraphy of the Taman Peninsula is defined using the sections at Zelensky Hill — Panagia, Popov Kamen, Taman and Zheleznyi Rog. The stratigraphy is constructed from distribution of mollusks, foraminifers, nannofossils, diatoms, and organic-walled phytoplankton, as well as incorporating paleomagnetic data. The occurrence of oceanic diatom species in the Middle-Upper Sarmatian, Maeotian and Lower Pontian makes a direct correlation possible between the sections studied, the Mediterranean basin and oceanic zonation. The new data on planktonic and benthic biotic groups suggests a pulsating connection of the Eastern Paratethys with the open marine basins, especially during transitional intervals within constant environments. ...... (ABSTRACT)


Tadionova, E.P., Golovina, L.A., Filippova, N.Y., Trubikhin, V.M., Popov, S.V., Goncharova, I.A., Vernigorova, Y.V., Pinchuk, T.N., 2012. Middle-Upper Miocene stratigraphy of the Taman Peninsula, Eastern Paratethys. Central European Journal of Geosciences 4 (1), 188-204.


LARGER BENTHIC FORAMINIFERA OF THE TYPE MAASTRICHTIAN

Brief descriptions are presented of species of larger benthic foraminifera found in the type area of the Maastrichtian, supported by an identification key.

(ABSTRACT)


Renema, W., Hart, M.B., 2012. Larger benthic Foraminifera of the type Maastrichtian. In: Jagt, J.W.M., Donovan, S.K., Jagt-Yazykowa, E.A. (Eds), Fossils of the type Maastrichtian (Part 1): Scripta Geologica Special Issue, 8, pp. 33-43.


FAULT-CONTROLLED STRATIGRAPHY OF THE UPPER CRETACEOUS IN NE TUNISIA

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The palaeogeographic setting of the studied Ain Medheker section represents an Early Campanian to Early Maastrichtian moderately deep carbonate shelf to distal ramp position with high rates of hemipelagic carbonate production, periodically triggered by mass-flow processes. Syndepositional extensional tectonic processes are confirmed to the Early Campanian. Planktonic foraminifera identified in thin sections and calcareous nannofossils allow the identication of the following biozones: Globotruncanita elevata, Contusotruncana plummerae (replacing former Globotruncana ventricosa Zone), Radotruncana calcarata, Globotruncana falsostuarti, and Gansserina gansseri. The following stable C-isotope events were identified: the Santonian/Campanian boundary Event, the Mid-Campanian Event, and the Late Campanian Event. Together with further four minor isotopic events, they allow for correlation between the western and eastern realms of Tunisia. Frequently occurring turbidites were studied in detail and discussed in comparison with contourites.

(ABSTRACT)


Bey, S., Kuss, J., Premoli Silva, I., Negra, H.M., Gardin, S., 2012. Fault-controlled stratigraphy of the Late Cretaceous Abiod Formation at Ain Medheker(Northeast Tunisia). Cretaceous Research 34, 10-25, doi:10.1016/j.cretres.2011.09.008


INFLUENCE OF ICE SHEET MELTING ON HIGH NORTHERN LATITUDE CLIMATE DURING THE LIG

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Although the Last Interglacial (LIG) is often considered as a possible analogue for future climate in high latitudes, its precise climate evolution and associated causes remain uncertain. Here we compile high-resolution marine sediment records from the North Atlantic, Labrador Sea, Norwegian Sea and the Southern Ocean. We document a delay in the establishment of peak interglacial conditions in the North Atlantic, Labrador and Norwegian Seas as compared to the Southern Ocean. In particular, we observe a persistent iceberg melting at high northern latitudes at the beginning of the LIG. It is associated with (1) colder and fresher surface-water conditions in the North Atlantic, Labrador and Norwegian Seas, and (2) a weaker ventilation of North Atlantic deep waters during the early LIG (129–125 ka) compared to the late LIG. Results from an ocean-atmosphere coupled model with insolation as a sole forcing for three key periods of the LIG show warmer North Atlantic surface waters and stronger Atlantic overturning during the early LIG (126 ka) than the late LIG (122 ka). Hence, insolation variations alone do not explain the delay in peak interglacial conditions observed at high northern latitudes. ...... (ABSTRACT)


Govin, A., Braconnot, P., Capron, E., Cortijo, E., Duplessy, J.-C., Jansen, E., Labeyrie, L., Landais, A., Marti, O., Michel, E., Mosquet, E., Risebrobakken, B., Swingedouw, D., Waelbroeck, C., 2012. Persistent influence of ice sheet melting on high northern latitude climate during the early Last Interglacial. Climate of the Past 8, 483-507.


25-kyr RECORD OF DEEP WATER IN THE MID-LATITUDE WESTERN NORTH PACIFIC

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We reconstructed the ventilation record of deep water at 2100 m depth in the mid-latitude western North Pacific over the past 25 kyr from radiocarbon measurements of coexisting planktic and benthic foraminiferal shells in sediment with a high sedimentation rate. The 14C data on fragile and robust planktic foraminiferal shells were concordant with each other, ensuring high quality of the reconstructed ventilation record. The radiocarbon activity changes were consistent with the atmospheric record, suggesting that no massive mixing of old carbon from the abyssal reservoir occurred throughout the glacial to deglacial periods. (ABSTRACT)


Okazaki, Y., Sagawa, T., Asahi, H., Horikawa, K., Onodera, J., 2012. Ventilation changes in the western North Pacific since the last glacial period. Climate of the Past 8, 17-24.


CARBONATE FACIES CONTROL ON BENTHIC FORAMINIFERAL ASSEMBLAGES

Although the field of taphonomy has existed for >70 years, the majority of work has focused on siliciclastic settings at the expense of pure carbonates. The large variety of carbonate sediment types, together with the growing recognition that carbonate platforms are composed of facies mosaics that shift laterally in time and are frequently superimposed in the rock record, raises the question of whether quantitative paleoecological studies focused on the fossil record in carbonate environments are subject to significant biases with successive vertical facies changes. This study combines live-dead and surface-subsurface analyses on communities of benthic foraminifera from four localities around San Salvador Island, Bahamas, that represent a spectrum of energy settings, bioturbation intensity, and local anthropogenic impact, in order to test the fidelity with which community data are translated from life to death assemblage on the surface, and from death assemblage to the subsurface (i.e., subfossil record) in these different facies. ...... Overall, the results of this study represent strong taphonomic vindication for quantitative paleoecological studies spanning facies changes in the carbonate fossil record. (ABSTRACT)


Darroch, S.A.F., 2012. Carbonate facies control on the fidelity of surface-subsurface agreement in benthic foraminiferal assemblages: Implications for index-based paleoecology. Palaios, 27 (3), 137-150.


CHRONOSTRATIGRAPHY OF THE BOLTAÑA ANTICLINE AND THE AINSA BASIN, SOUTHERN PYRENEES

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The Ainsa Basin (south-central Pyrenees) is an exceptional example of a syntectonic foreland basin where structures oblique to the Pyrenean trend are well preserved. The absence of a complete chronostratigraphic frame motivated us to perform a detailed magnetostratigraphic study in the Ainsa Basin, including the shallow-marine–continental transition. Three sections covering almost the entire Eocene sedimentary fill were sampled (Ara, Coscollar, and Mondot), covering 2450 m of the sedimentary pile, with more than 1000 demagnetized specimens (sample spacing of 2.7 m). ...... Biostratigraphy based on shallow benthic foraminifera (15 localities) and a locality with abundant charophyte gyrogonites help to constrain the local magnetostratigraphic record (20 reversals) between the early Ilerdian and the middle Priabonian. A global correlation based on a magnetostratigraphic composite section derived from this work allows us to propose a complete chronostratigraphic frame for the Ainsa Basin infill between 55 and 45 Ma. ...... (ABSTRACT)


Mochales, T., Barnolas, A., Pueyo, E.L., Serra-Kiel, J., Casas, A.M., Samsó, J.M., Ramajo, J., Sanjuán, J., in press. Chronostratigraphy of the Boltaña anticline and the Ainsa Basin (southern Pyrenees). The Geological Society of America Bulletin, doi:10.1130/B30418.1


IMPLICATIONS OF PLIOCENE GLOBAL SEA LEVEL FOR ANTARCTIC DEGLACIATION

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We obtained global sea-level (eustatic) estimates with a peak of ∼22 m higher than present for the Pliocene interval 2.7–3.2 Ma from backstripping in Virginia (United States), New Zealand, and Enewetak Atoll (north Pacific Ocean), benthic foraminiferal δ18O values, and Mg/Ca-δ18O estimates. Statistical analysis indicates that it is likely (68% confidence interval) that peak sea level was 22 ± 5 m higher than modern, and extremely likely (95%) that it was 22 ± 10 m higher than modern. Benthic foraminiferal δ18O values appear to require that the peak was <20–21 m. Our estimates imply loss of the equivalent of the Greenland and West Antarctic ice sheets, and some volume loss from the East Antarctic Ice Sheet, and address the long-standing controversy concerning the Pliocene stability of the East Antarctic Ice Sheet. (ABSTRACT)


Miller, K.G., Wright, J.D., Browning, J.V., Kulpecz, A., Kominz, M., Naish, T.R., Cramer, B.S., Rosenthal, Y., Peltier, W.R., Sosdian, S., in press. Expand High tide of the warm Pliocene: Implications of global sea level for Antarctic deglaciation. Geology, doi:10.1130/G32869.1


ASSEMBLAGE TURNOVER DURING INTENSIFICATION OF THE NORTHERN HEMISPHERE GLACIATION

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We present the results of a high-resolution analysis of the benthic foraminiferal assemblages at the Punta Piccola section (Stratotype for the Piacenzian Stage), which spans the gradual climate transition of the intensification of the Northern Hemisphere glaciation (3.6-2.6 Ma). This study highlighted a major benthic foraminiferal fauna turnover, which started at about 3.05 Ma with LO of Cibicidoides italicus, registered the gradual decline of Stilostomella spp. and culminated at about 2.7-2.75 Ma, when the dominant Siphonina reticulata was replaced by Cibicidoides pachyderma, costate Bulimine, spinose Bulimine, spinose Uvigerine and the Bolivina dilatata group. ......
Highlights ► New micropaleontological analysis at the Piacenzian Punta Piccola section. ► A benthic faunal turnover during the intensification of the NHG is recorded. ► Palaeoenvironmental changes are identified by compositional data analysis. ► Differences between sapropelite clusters are investigated. (ABSTRACT)


Sagrrella, F., Di Donato, V., Sprovieri, R., in press. Benthic foraminiferal assemblage turnover during intensification of the Northern Hemisphere glaciation in the Piacenzian Punta Piccola section (Southern Italy). Palaeogeography, Palaeoclimatology, Palaeoecology, doi:10.1016/j.palaeo.2012.03.009


IMPLICATIONS OF PLIOCENE GLOBAL SEA LEVEL FOR ANTARCTIC DEGLACIATION

Geology cover.gif

We obtained global sea-level (eustatic) estimates with a peak of ∼22 m higher than present for the Pliocene interval 2.7–3.2 Ma from backstripping in Virginia (United States), New Zealand, and Enewetak Atoll (north Pacific Ocean), benthic foraminiferal δ18O values, and Mg/Ca-δ18O estimates. Statistical analysis indicates that it is likely (68% confidence interval) that peak sea level was 22 ± 5 m higher than modern, and extremely likely (95%) that it was 22 ± 10 m higher than modern. Benthic foraminiferal δ18O values appear to require that the peak was <20–21 m. Our estimates imply loss of the equivalent of the Greenland and West Antarctic ice sheets, and some volume loss from the East Antarctic Ice Sheet, and address the long-standing controversy concerning the Pliocene stability of the East Antarctic Ice Sheet. (ABSTRACT)


Miller, K.G., Wright, J.D., Browning, J.V., Kulpecz, A., Kominz, M., Naish, T.R., Cramer, B.S., Rosenthal, Y., Peltier, W.R., Sosdian, S., in press. Expand High tide of the warm Pliocene: Implications of global sea level for Antarctic deglaciation. Geology, doi:10.1130/G32869.1


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