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 34 Ma) 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 ove...
Published in: | Journal of Geophysical Research: Earth Surface |
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American Geophysical Union
2019
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Online Access: | http://nora.nerc.ac.uk/id/eprint/522745/ https://nora.nerc.ac.uk/id/eprint/522745/1/Paxman_et_al-2019-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1029/2018JF004705 |
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ftnerc:oai:nora.nerc.ac.uk:522745 2023-05-15T13:41:43+02:00 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. 2019-03 text http://nora.nerc.ac.uk/id/eprint/522745/ https://nora.nerc.ac.uk/id/eprint/522745/1/Paxman_et_al-2019-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1029/2018JF004705 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/522745/1/Paxman_et_al-2019-Journal_of_Geophysical_Research__Earth_Surface.pdf Paxman, Guy J. G.; Jamieson, Stewart S. R.; Ferraccioli, Fausto orcid:0000-0002-9347-4736 Bentley, Michael J.; Ross, Neil; Watts, Anthony B.; Leitchenkov, German; Armadillo, Egidio; Young, Duncan A. 2019 The role of lithospheric flexure in the landscape evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica. Journal of Geophysical Research: Earth Surface, 124 (3). 812-829. https://doi.org/10.1029/2018JF004705 <https://doi.org/10.1029/2018JF004705> cc_by_4 CC-BY Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1029/2018JF004705 2023-02-04T19:48:01Z Reconstructions of the bedrock topography of Antarctica since the Eocene‐Oligocene Boundary (approximately 34 Ma) 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 14 Ma, 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 Antarctica Journal East Antarctica Ice Sheet Victoria Land Natural Environment Research Council: NERC Open Research Archive Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Rennick ENVELOPE(161.500,161.500,-72.000,-72.000) Journal of Geophysical Research: Earth Surface 124 3 812 829 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Reconstructions of the bedrock topography of Antarctica since the Eocene‐Oligocene Boundary (approximately 34 Ma) 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 14 Ma, 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. |
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. |
spellingShingle |
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 |
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 |
American Geophysical Union |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/522745/ https://nora.nerc.ac.uk/id/eprint/522745/1/Paxman_et_al-2019-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1029/2018JF004705 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) ENVELOPE(161.500,161.500,-72.000,-72.000) |
geographic |
Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Wilkes Subglacial Basin Rennick |
geographic_facet |
Antarctic East Antarctica Victoria Land East Antarctic Ice Sheet Transantarctic Mountains Wilkes Subglacial Basin Rennick |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Sheet Victoria Land |
op_relation |
https://nora.nerc.ac.uk/id/eprint/522745/1/Paxman_et_al-2019-Journal_of_Geophysical_Research__Earth_Surface.pdf Paxman, Guy J. G.; Jamieson, Stewart S. R.; Ferraccioli, Fausto orcid:0000-0002-9347-4736 Bentley, Michael J.; Ross, Neil; Watts, Anthony B.; Leitchenkov, German; Armadillo, Egidio; Young, Duncan A. 2019 The role of lithospheric flexure in the landscape evolution of the Wilkes Subglacial Basin and Transantarctic Mountains, East Antarctica. Journal of Geophysical Research: Earth Surface, 124 (3). 812-829. https://doi.org/10.1029/2018JF004705 <https://doi.org/10.1029/2018JF004705> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
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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1766154480729980928 |