Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA 2012 (3)"

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{{Recent Publications on Foraminifera Navigation}}<font size="2">
 
{{Recent Publications on Foraminifera Navigation}}<font size="2">
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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">
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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.
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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">
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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.
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<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">
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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 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.
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<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.
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<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">
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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/>
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'''Highlights'''
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► 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.
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<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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==Sr ISOTOPE FRACTION OF PLANKTIC FORAMINIFERA AND INORGANIC CALCITE==
 
==Sr ISOTOPE FRACTION OF PLANKTIC FORAMINIFERA AND INORGANIC CALCITE==

Revision as of 18:21, 27 July 2012