The Origin of a Polar Ice Sheet in East Antarctica
This award supports a study to determine the sequence and chronology of events that led to the development of the Antarctic ice sheet. A continental-scale ice sheet probably first developed in East Antarctica close to the Eocene-Oligocene boundary under temperate climatic conditions. The purpose of...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1199 2023-05-15T13:48:25+02:00 The Origin of a Polar Ice Sheet in East Antarctica Denton, George H. 2001-10-04T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/193 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1199&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/193 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1199&context=orsp_reports This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). University of Maine Office of Research Administration: Grant Reports Antarctic Glaciology Climate Change Climate Glaciology text 2001 ftmaineuniv 2023-03-12T19:15:56Z This award supports a study to determine the sequence and chronology of events that led to the development of the Antarctic ice sheet. A continental-scale ice sheet probably first developed in East Antarctica close to the Eocene-Oligocene boundary under temperate climatic conditions. The purpose of this project is to determine, from landscape analysis (with a numerical chronology), when (and why) these early temperate conditions gave way to a polar environment in Antarctica. From previous field work and recent photographic analysis, an extensive relict landscape (older than 17 million years) with landforms and erosional features characteristic of temperate glaciation has been delineated. This relict landscape has been called the Sessrumnir erosion surface and it extends over three degrees of latitude and covers almost 10,000 km2 in three fault blocks of the Transantarctic Mountains (Convoy, Dry Valleys, Royal Society). It is on this relict land surface that data will be collected which record Middle and Early Miocene glacial history and paleoclimate. The results should allow an identification of the transition from temperate to polar conditions. This work will involve landscape analysis, stratigraphy of glacial deposits, and Argon-40/Argon-39 dating of volcanic ashfalls. Denudation rates will come from fission-track analyses and from exposure-age analyses of bedrock surfaces and erratic boulders. The overall results will elucidate the origin and stability of the polar Antarctic cryosphere. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet The University of Maine: DigitalCommons@UMaine Antarctic The Antarctic East Antarctica Transantarctic Mountains |
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Open Polar |
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The University of Maine: DigitalCommons@UMaine |
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Antarctic Glaciology Climate Change Climate Glaciology |
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Antarctic Glaciology Climate Change Climate Glaciology Denton, George H. The Origin of a Polar Ice Sheet in East Antarctica |
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Antarctic Glaciology Climate Change Climate Glaciology |
description |
This award supports a study to determine the sequence and chronology of events that led to the development of the Antarctic ice sheet. A continental-scale ice sheet probably first developed in East Antarctica close to the Eocene-Oligocene boundary under temperate climatic conditions. The purpose of this project is to determine, from landscape analysis (with a numerical chronology), when (and why) these early temperate conditions gave way to a polar environment in Antarctica. From previous field work and recent photographic analysis, an extensive relict landscape (older than 17 million years) with landforms and erosional features characteristic of temperate glaciation has been delineated. This relict landscape has been called the Sessrumnir erosion surface and it extends over three degrees of latitude and covers almost 10,000 km2 in three fault blocks of the Transantarctic Mountains (Convoy, Dry Valleys, Royal Society). It is on this relict land surface that data will be collected which record Middle and Early Miocene glacial history and paleoclimate. The results should allow an identification of the transition from temperate to polar conditions. This work will involve landscape analysis, stratigraphy of glacial deposits, and Argon-40/Argon-39 dating of volcanic ashfalls. Denudation rates will come from fission-track analyses and from exposure-age analyses of bedrock surfaces and erratic boulders. The overall results will elucidate the origin and stability of the polar Antarctic cryosphere. |
format |
Text |
author |
Denton, George H. |
author_facet |
Denton, George H. |
author_sort |
Denton, George H. |
title |
The Origin of a Polar Ice Sheet in East Antarctica |
title_short |
The Origin of a Polar Ice Sheet in East Antarctica |
title_full |
The Origin of a Polar Ice Sheet in East Antarctica |
title_fullStr |
The Origin of a Polar Ice Sheet in East Antarctica |
title_full_unstemmed |
The Origin of a Polar Ice Sheet in East Antarctica |
title_sort |
origin of a polar ice sheet in east antarctica |
publisher |
DigitalCommons@UMaine |
publishDate |
2001 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/193 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1199&context=orsp_reports |
geographic |
Antarctic The Antarctic East Antarctica Transantarctic Mountains |
geographic_facet |
Antarctic The Antarctic East Antarctica Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/193 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1199&context=orsp_reports |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
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