Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula
Sediment drifts on the continental rise are located proximal to the western side of the Antarctic Peninsula and recorded changes in glacial volume and thermal regime over the last ca. 15 m.y. At Ocean Drilling Program (ODP) Site 1101 (Leg 178), which recovered sediments back to 3.1 Ma, glacial -inte...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
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Elsevier
2008
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Online Access: | http://nora.nerc.ac.uk/id/eprint/11438/ http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V6R-4S7J63J-1&_user=1773399&_coverDate=08%2F11%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1604935853&_rerunOrigin=google&_acct=C000054485&_version |
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ftnerc:oai:nora.nerc.ac.uk:11438 2023-05-15T13:45:10+02:00 Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula Cowan, Ellen A. Hillenbrand, Claus-Dieter Hassler, Lauren E. Ake, Matthew T. 2008 http://nora.nerc.ac.uk/id/eprint/11438/ http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V6R-4S7J63J-1&_user=1773399&_coverDate=08%2F11%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1604935853&_rerunOrigin=google&_acct=C000054485&_version unknown Elsevier Cowan, Ellen A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Hassler, Lauren E.; Ake, Matthew T. 2008 Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula. Palaeogeography, Palaeoclimatology, Palaeoecology, 265 (3-4). 275-291. https://doi.org/10.1016/j.palaeo.2008.03.010 <https://doi.org/10.1016/j.palaeo.2008.03.010> Meteorology and Climatology Glaciology Earth Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1016/j.palaeo.2008.03.010 2023-02-04T19:27:21Z Sediment drifts on the continental rise are located proximal to the western side of the Antarctic Peninsula and recorded changes in glacial volume and thermal regime over the last ca. 15 m.y. At Ocean Drilling Program (ODP) Site 1101 (Leg 178), which recovered sediments back to 3.1 Ma, glacial -interglacial cyclicity was identified based on the biogenic component and sedimentary structures observed in X-radiographs, magnetic susceptibility and lithofacies descriptions. Glacial intervals are dominated by fine-grained laminated mud and interglacial units consist of bioturbated muds enriched in biogenic components. From 2.2 to 0.76 Ma, planktonic foraminifera and calcareous nannofossils dominate in the interglacials suggesting a shift of the Antarctic Polar Front (APF) to the south near the drifts. Prior to 2.2 Ma, cyclicity cannot be identified and diatoms dominate the biogenic component and high percent opal suggests warmer conditions south of the APF and reduced sea ice over the drifts. Analyses of the coarse-grained terrigenous fraction (pebbles and coarse sand) from Sites 1096 and 1101 record glaciers at sea-level releasing iceberg-rafted debris (IRD) throughout the last 3.1 m.y. Analyses of quartz sand grains in IRD with the scanning electron microscope (SEM) show an abrupt change in the frequency of occurrence of microtextures at similar to 1.35 Ma. During the Late Pliocene to Early Pleistocene, the population of quartz grains included completely weathered grains and a low frequency of crushing and abrasion, suggesting that glaciers were small and did not inundate the topography. Debris shed from mountain peaks was transported supraglacially or englacially allowing weathered grains to pass through the glacier unmodified. During glacial periods from 1.35-0.76 Ma, glaciers expanded in size. The HID flux was very high and dropstones have diverse lithologies. Conditions resembling those at the Last Glacial Maximum (LGM) have been episodically present on the Antarctic Peninsula since similar to 0.76 Ma. Quartz ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Iceberg* Planktonic foraminifera Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula The Antarctic Palaeogeography, Palaeoclimatology, Palaeoecology 265 3-4 275 291 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology Glaciology Earth Sciences |
spellingShingle |
Meteorology and Climatology Glaciology Earth Sciences Cowan, Ellen A. Hillenbrand, Claus-Dieter Hassler, Lauren E. Ake, Matthew T. Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
topic_facet |
Meteorology and Climatology Glaciology Earth Sciences |
description |
Sediment drifts on the continental rise are located proximal to the western side of the Antarctic Peninsula and recorded changes in glacial volume and thermal regime over the last ca. 15 m.y. At Ocean Drilling Program (ODP) Site 1101 (Leg 178), which recovered sediments back to 3.1 Ma, glacial -interglacial cyclicity was identified based on the biogenic component and sedimentary structures observed in X-radiographs, magnetic susceptibility and lithofacies descriptions. Glacial intervals are dominated by fine-grained laminated mud and interglacial units consist of bioturbated muds enriched in biogenic components. From 2.2 to 0.76 Ma, planktonic foraminifera and calcareous nannofossils dominate in the interglacials suggesting a shift of the Antarctic Polar Front (APF) to the south near the drifts. Prior to 2.2 Ma, cyclicity cannot be identified and diatoms dominate the biogenic component and high percent opal suggests warmer conditions south of the APF and reduced sea ice over the drifts. Analyses of the coarse-grained terrigenous fraction (pebbles and coarse sand) from Sites 1096 and 1101 record glaciers at sea-level releasing iceberg-rafted debris (IRD) throughout the last 3.1 m.y. Analyses of quartz sand grains in IRD with the scanning electron microscope (SEM) show an abrupt change in the frequency of occurrence of microtextures at similar to 1.35 Ma. During the Late Pliocene to Early Pleistocene, the population of quartz grains included completely weathered grains and a low frequency of crushing and abrasion, suggesting that glaciers were small and did not inundate the topography. Debris shed from mountain peaks was transported supraglacially or englacially allowing weathered grains to pass through the glacier unmodified. During glacial periods from 1.35-0.76 Ma, glaciers expanded in size. The HID flux was very high and dropstones have diverse lithologies. Conditions resembling those at the Last Glacial Maximum (LGM) have been episodically present on the Antarctic Peninsula since similar to 0.76 Ma. Quartz ... |
format |
Article in Journal/Newspaper |
author |
Cowan, Ellen A. Hillenbrand, Claus-Dieter Hassler, Lauren E. Ake, Matthew T. |
author_facet |
Cowan, Ellen A. Hillenbrand, Claus-Dieter Hassler, Lauren E. Ake, Matthew T. |
author_sort |
Cowan, Ellen A. |
title |
Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
title_short |
Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
title_full |
Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
title_fullStr |
Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
title_full_unstemmed |
Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula |
title_sort |
coarse-grained terrigenous sediment deposition on continental rise drifts: a record of plio-pleistocene glaciation on the antarctic peninsula |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/11438/ http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V6R-4S7J63J-1&_user=1773399&_coverDate=08%2F11%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1604935853&_rerunOrigin=google&_acct=C000054485&_version |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Iceberg* Planktonic foraminifera Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Iceberg* Planktonic foraminifera Sea ice |
op_relation |
Cowan, Ellen A.; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Hassler, Lauren E.; Ake, Matthew T. 2008 Coarse-grained terrigenous sediment deposition on continental rise drifts: a record of Plio-Pleistocene glaciation on the Antarctic Peninsula. Palaeogeography, Palaeoclimatology, Palaeoecology, 265 (3-4). 275-291. https://doi.org/10.1016/j.palaeo.2008.03.010 <https://doi.org/10.1016/j.palaeo.2008.03.010> |
op_doi |
https://doi.org/10.1016/j.palaeo.2008.03.010 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
265 |
container_issue |
3-4 |
container_start_page |
275 |
op_container_end_page |
291 |
_version_ |
1766214566002294784 |