Chemical Weathering History of Antarctica During A Late Eocene Glacial Event
Several proxies for ocean temperature, ice sheet growth, and continental weathering analyzed from ODP Site 738 sediments off the coast of East Antarctica have offered insight into the variable climate of the Paleogene 'greenhouse.' In this study, I compile evidence from fine fraction carbo...
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ftunivsouthcar:oai:scholarcommons.sc.edu:etd-2336 2023-06-11T04:04:58+02:00 Chemical Weathering History of Antarctica During A Late Eocene Glacial Event Munn, Gabrielle Hayes 2011-01-01T08:00:00Z application/pdf https://scholarcommons.sc.edu/etd/1335 https://scholarcommons.sc.edu/context/etd/article/2336/viewcontent/Munn_sc_0202M_11823.pdf unknown Scholar Commons https://scholarcommons.sc.edu/etd/1335 https://scholarcommons.sc.edu/context/etd/article/2336/viewcontent/Munn_sc_0202M_11823.pdf Theses and Dissertations Antarctica Fish teeth Glacial Late Eocene Neodymium Weathering Earth Sciences Geology Physical Sciences and Mathematics text 2011 ftunivsouthcar 2023-05-06T22:23:42Z Several proxies for ocean temperature, ice sheet growth, and continental weathering analyzed from ODP Site 738 sediments off the coast of East Antarctica have offered insight into the variable climate of the Paleogene 'greenhouse.' In this study, I compile evidence from fine fraction carbonate, benthic foraminifera, fossil fish teeth, detrital sediment, and sea level records to build a case for the existence of a brief cooling event accompanied by the growth of an ephemeral ice sheet 37.15 Ma, three million years prior to the onset of early Oligocene Antarctic glaciation. The d18O values for both the fine fraction carbonate and benthic foraminifera (Cibicidoides spp.) increased ~0.6 ppm, reflecting a combination of ice sheet growth and deep water cooling. Fossil fish teeth and detrital sediments were analyzed for eNd, a proxy for continental weathering, revealing negative excursions of ~1 and 3 eNd units, respectively. These negative eNd excursions indicate an influx of older, crustal material into circum-Antarctic waters. Miller et al. (2005) reports a sea level drop of ~20 meters beginning 37.15 Ma. Collectively, the data from these proxies indicate the most likely explanation for these phenomena is the growth of an ice sheet during this short-lived cooling period 37.15-36.9 My. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet University of South Carolina Libraries: Scholar Commons Antarctic East Antarctica |
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University of South Carolina Libraries: Scholar Commons |
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Antarctica Fish teeth Glacial Late Eocene Neodymium Weathering Earth Sciences Geology Physical Sciences and Mathematics |
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Antarctica Fish teeth Glacial Late Eocene Neodymium Weathering Earth Sciences Geology Physical Sciences and Mathematics Munn, Gabrielle Hayes Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
topic_facet |
Antarctica Fish teeth Glacial Late Eocene Neodymium Weathering Earth Sciences Geology Physical Sciences and Mathematics |
description |
Several proxies for ocean temperature, ice sheet growth, and continental weathering analyzed from ODP Site 738 sediments off the coast of East Antarctica have offered insight into the variable climate of the Paleogene 'greenhouse.' In this study, I compile evidence from fine fraction carbonate, benthic foraminifera, fossil fish teeth, detrital sediment, and sea level records to build a case for the existence of a brief cooling event accompanied by the growth of an ephemeral ice sheet 37.15 Ma, three million years prior to the onset of early Oligocene Antarctic glaciation. The d18O values for both the fine fraction carbonate and benthic foraminifera (Cibicidoides spp.) increased ~0.6 ppm, reflecting a combination of ice sheet growth and deep water cooling. Fossil fish teeth and detrital sediments were analyzed for eNd, a proxy for continental weathering, revealing negative excursions of ~1 and 3 eNd units, respectively. These negative eNd excursions indicate an influx of older, crustal material into circum-Antarctic waters. Miller et al. (2005) reports a sea level drop of ~20 meters beginning 37.15 Ma. Collectively, the data from these proxies indicate the most likely explanation for these phenomena is the growth of an ice sheet during this short-lived cooling period 37.15-36.9 My. |
format |
Text |
author |
Munn, Gabrielle Hayes |
author_facet |
Munn, Gabrielle Hayes |
author_sort |
Munn, Gabrielle Hayes |
title |
Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
title_short |
Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
title_full |
Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
title_fullStr |
Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
title_full_unstemmed |
Chemical Weathering History of Antarctica During A Late Eocene Glacial Event |
title_sort |
chemical weathering history of antarctica during a late eocene glacial event |
publisher |
Scholar Commons |
publishDate |
2011 |
url |
https://scholarcommons.sc.edu/etd/1335 https://scholarcommons.sc.edu/context/etd/article/2336/viewcontent/Munn_sc_0202M_11823.pdf |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
Theses and Dissertations |
op_relation |
https://scholarcommons.sc.edu/etd/1335 https://scholarcommons.sc.edu/context/etd/article/2336/viewcontent/Munn_sc_0202M_11823.pdf |
_version_ |
1768392347150712832 |