East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic
Abstract This research focuses on a detailed study of faunal and biogeochemical changes that occurred at ODP Hole 747A in the Kerguelen Plateau region of the Southern Ocean during the middle Miocene (14.8-11.8 Ma). Abundance fluctuations of several planktonic foraminiferal taxa, stable oxygen isotop...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.505.8817 2023-05-15T13:51:04+02:00 East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic Foraminifera (odp Hole A Kerguelen Plateau The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.8817 http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.8817 http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf text ftciteseerx 2016-01-08T09:22:18Z Abstract This research focuses on a detailed study of faunal and biogeochemical changes that occurred at ODP Hole 747A in the Kerguelen Plateau region of the Southern Ocean during the middle Miocene (14.8-11.8 Ma). Abundance fluctuations of several planktonic foraminiferal taxa, stable oxygen isotope and Mg/Ca ratios have been integrated as a multi-proxy approach to reach a better understanding of the growth modality and fluctuations of the East Antarctic Ice Sheet (EAIS) during this period. A 7°C decrease in Sea Surface Temperature (SST), an abrupt turnover in the planktonic foraminiferal assemblage, a 1.5 ‰ shift towards heavier δ18O values (Mi3 event) and a related shift towards heavier seawater δ18O values between 13.9 and 13.7 Ma, are interpreted to reflect rapid surface water cooling and EAIS expansion. Hole 747A data suggest a major change in the variability of the climate system fostered by EAIS expansion between 13.9 and 13.7 Ma. Ice sheet fluctuations were greater during the interval 14.8-13.9 Ma compared with those from 13.7 to 11.8 Ma, whereas the latter interval was characterized by a more stable EAIS. In our opinion, the middle Miocene ice sheet expansion in Antarctica represents a first step towards the development of the modern permanent ice Text Antarc* Antarctic Antarctica Ice Sheet Southern Ocean Unknown Antarctic East Antarctic Ice Sheet Kerguelen Southern Ocean |
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English |
description |
Abstract This research focuses on a detailed study of faunal and biogeochemical changes that occurred at ODP Hole 747A in the Kerguelen Plateau region of the Southern Ocean during the middle Miocene (14.8-11.8 Ma). Abundance fluctuations of several planktonic foraminiferal taxa, stable oxygen isotope and Mg/Ca ratios have been integrated as a multi-proxy approach to reach a better understanding of the growth modality and fluctuations of the East Antarctic Ice Sheet (EAIS) during this period. A 7°C decrease in Sea Surface Temperature (SST), an abrupt turnover in the planktonic foraminiferal assemblage, a 1.5 ‰ shift towards heavier δ18O values (Mi3 event) and a related shift towards heavier seawater δ18O values between 13.9 and 13.7 Ma, are interpreted to reflect rapid surface water cooling and EAIS expansion. Hole 747A data suggest a major change in the variability of the climate system fostered by EAIS expansion between 13.9 and 13.7 Ma. Ice sheet fluctuations were greater during the interval 14.8-13.9 Ma compared with those from 13.7 to 11.8 Ma, whereas the latter interval was characterized by a more stable EAIS. In our opinion, the middle Miocene ice sheet expansion in Antarctica represents a first step towards the development of the modern permanent ice |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Foraminifera (odp Hole A Kerguelen Plateau |
spellingShingle |
Foraminifera (odp Hole A Kerguelen Plateau East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
author_facet |
Foraminifera (odp Hole A Kerguelen Plateau |
author_sort |
Foraminifera (odp Hole A |
title |
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
title_short |
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
title_full |
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
title_fullStr |
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
title_full_unstemmed |
East Antarctic Ice Sheet fluctuations during the Middle Miocene Climatic Transition inferred from faunal and biogeochemical data on planktonic |
title_sort |
east antarctic ice sheet fluctuations during the middle miocene climatic transition inferred from faunal and biogeochemical data on planktonic |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.8817 http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf |
geographic |
Antarctic East Antarctic Ice Sheet Kerguelen Southern Ocean |
geographic_facet |
Antarctic East Antarctic Ice Sheet Kerguelen Southern Ocean |
genre |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Southern Ocean |
op_source |
http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.8817 http://pubs.usgs.gov/of/2007/1047/srp/srp037/of2007-1047srp037.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766254662938263552 |