Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA 2012 (3)"
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| − | '''[[ | + | {{Recent Publications on Foraminifera Navigation}}<font size="2"> |
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| + | ==THE ECOLOGY AND BIOGEOGRAPHY OF ''Discospirina tenuissima'' IN THE ATLANTIC AND INDIAN OCEANS== | ||
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| + | [[Image:Deep-Sea_Research_II_front.gif|left|80px|]]<font size="2"> | ||
| + | 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 m<sup>2</sup> 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. | ||
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| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0967064512000781 ABSTRACT]) | ||
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| + | ----Gooday, A.J., Alt, C.H.S., Jones, D.O.B., Shale, D., Marsden, K., Brasier, M.D., in press. [http://www.sciencedirect.com/science/article/pii/S0967064512000781 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 | ||
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| + | ==EARLY STALL OF WEST ANTARCTIC ICE SHEET ADVANCE ON THE EASTERN ROSS SEA MIDDLE SHELF== | ||
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| + | [[Image:PPP_front.gif|left|80px|]]<font size="2"> | ||
| + | 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. ...... | ||
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| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0031018211004330 ABSTRACT]) | ||
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| + | ----Bart, P.J., Cone, A.N., 2012. [http://www.sciencedirect.com/science/article/pii/S0031018211004330 Early stall of West Antarctic Ice Sheet advance on the eastern Ross Sea middle shelf followed by retreat at 27,500 <sup>14</sup>C yr BP]. Palaeogeography, Palaeoclimatology, Palaeoecology 335-336, 52-60. | ||
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| + | ==MAGNITUDE AND TIMING OF EQUATORIAL ATLANTIC SURFACE WARMING DURING THE LAST GLACIAL BIPOLAR OSCILLATIONS== | ||
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| + | [[Image:Climate_of_the_Past_front.jpg|left|80px|]]<font size="2"> | ||
| + | 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. | ||
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| + | <font size="2">([http://www.clim-past-discuss.net/8/1737/2012/ ABSTRACT]) | ||
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| + | ----Weldeab, S., 2012. [http://www.clim-past-discuss.net/8/1737/2012/ Magnitude and timing of Equatorial Atlantic surface warming during the last glacial bipolar oscillations]. Climate of the Past Discussion 8, 1737-1762. | ||
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| + | ==SST FOR LEFT-COILING ''Neogloboquadrina'' POPULATIONS IN THE WESTERN MOST MEDITERRANEAN IN PLEISTOCENE-PLIOCENE== | ||
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| + | [[Image:Geobios_cover.gif|left|80px|]]<font size="2"> | ||
| + | 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 (δ<sup>18</sup>O) 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). ...... | ||
| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0016699512000162 ABSTRACT]) | ||
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| + | ----Serrano, F., Guerra-Merchán, A., in press. [http://www.sciencedirect.com/science/article/pii/S0016699512000162 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 | ||
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| + | ==LATE MIOCENE PALAEOGEOGRAPHIC EVOLUTION OF THE ATLANTIC - MEDITERRANEAN SEAWAY== | ||
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| + | [[Image:Geobios_cover.gif|left|80px|]]<font size="2"> | ||
| + | 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. | ||
| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0016699512000332 ABSTRACT]) | ||
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| + | ----Corbí, H., Lancis, C., Harcía-García, F., Pina, J.-A., Soria, J.M, Tent-Manclús, J.E., Viseras, C., in press. [http://www.sciencedirect.com/science/article/pii/S0016699512000332 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 | ||
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| + | ==''Praeorbitolina''/''Palorbitolinoides'' ASSOCIATION: AN APTIAN BIOSTRATIGRAPHIC KEY-INTERVAL IN THE NEO-TETHYS== | ||
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| + | [[Image:CretaceousResearch_front.gif|left|80px|]]<font size="2"> | ||
| + | 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. | ||
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| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0195667112000420 ABSTRACT]) | ||
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| + | ----Cherchi, A., Schroeder, R., in press. [http://www.sciencedirect.com/science/article/pii/S0195667112000420 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 | ||
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| + | ==THE EVOLUTIONARY ORIGIN OF THE GENUS ''Hantkenina''== | ||
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| + | [[Image:RevueDeMicropaleontologie_front.gif|left|80px|]]<font size="2"> | ||
| + | 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. | ||
| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0035159812000153 ABSTRACT]) | ||
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| + | ----Coccioni, R., Bancalà, G., in press. [http://www.sciencedirect.com/science/article/pii/S0035159812000153 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 | ||
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| + | ==PETM IN SHALLOW-MARINE SUCCESSIONS OF THE ADRIATIC CARBONATE PLATFORM== | ||
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| + | [[Image:GAS_Bulletin.jpg|left|80px|]]<font size="2"> | ||
| + | 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 δ<sup>13</sup>C 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 <sup>13</sup>C-depleted δ<sup>13</sup>C 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. | ||
| + | <font size="2">([http://gsabulletin.gsapubs.org/content/early/2012/05/02/B30553.1.abstract ABSTRACT]) | ||
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| + | ----Zamagni, J., Mutti, M., Ballato, P., Košir, A., in press. [http://gsabulletin.gsapubs.org/content/early/2012/05/02/B30553.1.abstract 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 | ||
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| + | ==COASTAL SEDIMENTATION ASSOCIATED WITH THE TOHOKU TSUNAMI IN SOUTH KURIL ISLANDS, NW PACIFIC== | ||
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| + | 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. | ||
| + | <font size="2">([http://www.springerlink.com/content/0q7j471768hp25r1/ ABSTRACT]) | ||
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| + | ----Rzzjigaeva, N.G., Ganzey, L.A., Grebennikova, T.A., Ivanova, E.D., Kharlamov, A.A., Kaistrenko, V.M., Shishkin, A.A., 2012. [http://www.springerlink.com/content/0q7j471768hp25r1/ 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 | ||
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| + | ==THE 1ST <sup>14</sup>C ANALYSES FROM THE CENTRAL BALTIC SEA AND A PSV & Pb AGE MODEL == | ||
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| + | [[Image:QuaternaryScienceReviews_front.gif|left|80px| ]]<font size="2"> | ||
| + | Dating of sediment cores from the Baltic Sea has proven to be difficult due to uncertainties surrounding the <sup>14</sup>C 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 <sup>14</sup>C 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, <sup>14</sup>C determinations were carried out on benthic foraminifera (''Elphidium'' spec.) samples from the brackish Littorina stage of the Baltic Sea. ...... <br/> | ||
| + | '''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 <sup>14</sup>C analyses based on foraminifera for the central Baltic Sea are presented. ► An experimental gas ion source <sup>14</sup>C analysis technique is used on low mass samples. ► <sup>14</sup>C results are compared to the independent age model to infer reservoir age. | ||
| + | <font size="2">([http://www.sciencedirect.com/science/article/pii/S0277379112001321 ABSTRACT]) | ||
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| + | ----Lougheed, B.C., Snowball, I., Moros, M., Kabel, K., Muscheler, R., Virtasalo, J.J., Wacker, L., 2012. [http://www.sciencedirect.com/science/article/pii/S0277379112001321 Using an independent geochronology based on palaeomagnetic secular variation (PSV) and atmospheric Pb deposition to date Baltic Sea sediments and infer <sup>14</sup>C reservoir age]. Quaternary Science Reviews 42 , 43-58. | ||
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