The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica
Reconstructions of the bedrock topography of Antarctica since the Eocene-Oligocene Boundary (approximately 34Ma) provide important constraints for modeling Antarctic ice sheet evolution. This is particularly important in regions where the bedrock lies below sea level, since in these sectors the over...
Published in: | Journal of Geophysical Research: Earth Surface |
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2019
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Online Access: | http://hdl.handle.net/11567/942897 https://doi.org/10.1029/2018JF004705 |
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ftunivgenova:oai:iris.unige.it:11567/942897 2024-04-21T07:46:40+00:00 The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. 2019 STAMPA http://hdl.handle.net/11567/942897 https://doi.org/10.1029/2018JF004705 eng eng Blackwell Publishing Ltd country:USA info:eu-repo/semantics/altIdentifier/wos/WOS:000463993300009 volume:124 (2) firstpage:812 lastpage:829 numberofpages:18 journal:JOURNAL OF GEOPHYSICAL RESEARCH. EARTH SURFACE http://hdl.handle.net/11567/942897 doi:10.1029/2018JF004705 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85063090961 info:eu-repo/semantics/openAccess East Antarctica flexure glacial erosion landscape evolution paleotopography Geophysic Forestry Oceanography Aquatic Science Ecology Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Paleontology info:eu-repo/semantics/article 2019 ftunivgenova https://doi.org/10.1029/2018JF004705 2024-03-28T01:18:50Z Reconstructions of the bedrock topography of Antarctica since the Eocene-Oligocene Boundary (approximately 34Ma) provide important constraints for modeling Antarctic ice sheet evolution. This is particularly important in regions where the bedrock lies below sea level, since in these sectors the overlying ice sheet is thought to be most susceptible to past and future change. Here we use 3-D flexural modeling to reconstruct the evolution of the topography of the Wilkes Subglacial Basin (WSB) and Transantarctic Mountains (TAM) in East Antarctica. We estimate the spatial distribution of glacial erosion beneath the East Antarctic Ice Sheet, and restore this material to the topography, which is also adjusted for associated flexural isostatic responses. We independently constrain our post-34 Ma erosion estimates using offshore sediment stratigraphy interpretations. Our reconstructions provide a better-defined topographic boundary condition for modeling early East Antarctic Ice Sheet history. We show that the majority of glacial erosion and landscape evolution occurred prior to 14Ma, which we interpret to reflect more dynamic and erosive early ice sheet behavior. In addition, we use closely spaced 2-D flexural models to test previously proposed hypotheses for a flexural origin of the TAM and WSB. The pre-34 Ma topography shows lateral variations along the length of the TAM and WSB that cannot be explained by uniform flexure along the front of the TAM. We show that some of these variations may be explained by additional flexural uplift along the south-western flank of the WSB and the Rennick Graben in northern Victoria Land. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land Università degli Studi di Genova: CINECA IRIS Journal of Geophysical Research: Earth Surface 124 3 812 829 |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
topic |
East Antarctica flexure glacial erosion landscape evolution paleotopography Geophysic Forestry Oceanography Aquatic Science Ecology Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Paleontology |
spellingShingle |
East Antarctica flexure glacial erosion landscape evolution paleotopography Geophysic Forestry Oceanography Aquatic Science Ecology Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Paleontology Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
topic_facet |
East Antarctica flexure glacial erosion landscape evolution paleotopography Geophysic Forestry Oceanography Aquatic Science Ecology Water Science and Technology Soil Science Geochemistry and Petrology Earth-Surface Processe Atmospheric Science Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Paleontology |
description |
Reconstructions of the bedrock topography of Antarctica since the Eocene-Oligocene Boundary (approximately 34Ma) provide important constraints for modeling Antarctic ice sheet evolution. This is particularly important in regions where the bedrock lies below sea level, since in these sectors the overlying ice sheet is thought to be most susceptible to past and future change. Here we use 3-D flexural modeling to reconstruct the evolution of the topography of the Wilkes Subglacial Basin (WSB) and Transantarctic Mountains (TAM) in East Antarctica. We estimate the spatial distribution of glacial erosion beneath the East Antarctic Ice Sheet, and restore this material to the topography, which is also adjusted for associated flexural isostatic responses. We independently constrain our post-34 Ma erosion estimates using offshore sediment stratigraphy interpretations. Our reconstructions provide a better-defined topographic boundary condition for modeling early East Antarctic Ice Sheet history. We show that the majority of glacial erosion and landscape evolution occurred prior to 14Ma, which we interpret to reflect more dynamic and erosive early ice sheet behavior. In addition, we use closely spaced 2-D flexural models to test previously proposed hypotheses for a flexural origin of the TAM and WSB. The pre-34 Ma topography shows lateral variations along the length of the TAM and WSB that cannot be explained by uniform flexure along the front of the TAM. We show that some of these variations may be explained by additional flexural uplift along the south-western flank of the WSB and the Rennick Graben in northern Victoria Land. |
author2 |
Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. |
format |
Article in Journal/Newspaper |
author |
Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. |
author_facet |
Paxman, Guy J. G. Jamieson, Stewart S. R. Ferraccioli, Fausto Bentley, Michael J. Ross, Neil Watts, Anthony B. Leitchenkov, German Armadillo, Egidio Young, Duncan A. |
author_sort |
Paxman, Guy J. G. |
title |
The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
title_short |
The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
title_full |
The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
title_fullStr |
The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
title_full_unstemmed |
The Role of Lithospheric Flexure in the Landscape Evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica |
title_sort |
role of lithospheric flexure in the landscape evolution of the wilkes subglacial basin and transantarctic mountains, east antarctica |
publisher |
Blackwell Publishing Ltd |
publishDate |
2019 |
url |
http://hdl.handle.net/11567/942897 https://doi.org/10.1029/2018JF004705 |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000463993300009 volume:124 (2) firstpage:812 lastpage:829 numberofpages:18 journal:JOURNAL OF GEOPHYSICAL RESEARCH. EARTH SURFACE http://hdl.handle.net/11567/942897 doi:10.1029/2018JF004705 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85063090961 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018JF004705 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
124 |
container_issue |
3 |
container_start_page |
812 |
op_container_end_page |
829 |
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1796944176460333056 |