A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude
International audience Early to Middle Miocene sea-level oscillations of approximately 40-60 m estimated from farfield records 1,2,3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth 2. This contrasts with ice-sheet model experiments suggesting most terrestri...
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Online Access: | https://sde.hal.science/hal-03796588 https://sde.hal.science/hal-03796588/document https://sde.hal.science/hal-03796588/file/Marschalek_Main_Final-1.pdf https://doi.org/10.1038/s41586-021-04148-0 |
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ftunivlille:oai:HAL:hal-03796588v1 2024-06-23T07:46:08+00:00 A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude Marschalek, J. Zurli, L. Talarico, F. van de Flierdt, T. Vermeesch, P. Carter, A. Beny, F. Bout-Roumazeilles, V. Sangiorgi, F. Hemming, S. Pérez, L. Colleoni, F. Prebble, J. van Peer, T. Perotti, M. Shevenell, A. Browne, I. Kulhanek, D. Levy, R. Harwood, D. Sullivan, N. Meyers, S. Griffith, E. Hillenbrand, C.-D. Gasson, E. Siegert, M. Keisling, B. Licht, K. Kuhn, G. Dodd, J. Boshuis, C. de Santis, L. Mckay, R. Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 2021-12-16 https://sde.hal.science/hal-03796588 https://sde.hal.science/hal-03796588/document https://sde.hal.science/hal-03796588/file/Marschalek_Main_Final-1.pdf https://doi.org/10.1038/s41586-021-04148-0 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41586-021-04148-0 hal-03796588 https://sde.hal.science/hal-03796588 https://sde.hal.science/hal-03796588/document https://sde.hal.science/hal-03796588/file/Marschalek_Main_Final-1.pdf doi:10.1038/s41586-021-04148-0 info:eu-repo/semantics/OpenAccess ISSN: 0028-0836 EISSN: 1476-4687 Nature https://sde.hal.science/hal-03796588 Nature, 2021, 600 (7889), pp.450-455. ⟨10.1038/s41586-021-04148-0⟩ [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] info:eu-repo/semantics/article Journal articles 2021 ftunivlille https://doi.org/10.1038/s41586-021-04148-0 2024-06-10T14:49:09Z International audience Early to Middle Miocene sea-level oscillations of approximately 40-60 m estimated from farfield records 1,2,3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth 2. This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals of the Middle Miocene 4,5. Data and model outputs can be reconciled if a large West Antarctic Ice Sheet (WAIS) existed and expanded across most of the outer continental shelf during the Early Miocene, accounting for maximum ice-sheet volumes. Here, we provide the earliest geological evidence proving large WAIS expansions occurred during the Early Miocene (~17.72-17.40 Ma). Geochemical and petrographic data show glacimarine sediments recovered at International Ocean Discovery Program (IODP) Site U1521 in the central Ross Sea derive from West Antarctica, requiring the presence of a WAIS covering most of the Ross Sea continental shelf. Seismic, lithological and palynological data reveal the intermittent proximity of grounded ice to Site U1521. The erosion rate calculated from this sediment package greatly exceeds the long-term mean, implying rapid erosion of West Antarctica. This interval therefore captures a key step in the genesis of a marine-based WAIS and a tipping point in Antarctic ice-sheet evolution. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea West Antarctica LillOA (HAL Lille Open Archive, Université de Lille) Antarctic East Antarctica Ross Sea West Antarctica West Antarctic Ice Sheet Nature 600 7889 450 455 |
institution |
Open Polar |
collection |
LillOA (HAL Lille Open Archive, Université de Lille) |
op_collection_id |
ftunivlille |
language |
English |
topic |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] |
spellingShingle |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] Marschalek, J. Zurli, L. Talarico, F. van de Flierdt, T. Vermeesch, P. Carter, A. Beny, F. Bout-Roumazeilles, V. Sangiorgi, F. Hemming, S. Pérez, L. Colleoni, F. Prebble, J. van Peer, T. Perotti, M. Shevenell, A. Browne, I. Kulhanek, D. Levy, R. Harwood, D. Sullivan, N. Meyers, S. Griffith, E. Hillenbrand, C.-D. Gasson, E. Siegert, M. Keisling, B. Licht, K. Kuhn, G. Dodd, J. Boshuis, C. de Santis, L. Mckay, R. A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] [PHYS]Physics [physics] |
description |
International audience Early to Middle Miocene sea-level oscillations of approximately 40-60 m estimated from farfield records 1,2,3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth 2. This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals of the Middle Miocene 4,5. Data and model outputs can be reconciled if a large West Antarctic Ice Sheet (WAIS) existed and expanded across most of the outer continental shelf during the Early Miocene, accounting for maximum ice-sheet volumes. Here, we provide the earliest geological evidence proving large WAIS expansions occurred during the Early Miocene (~17.72-17.40 Ma). Geochemical and petrographic data show glacimarine sediments recovered at International Ocean Discovery Program (IODP) Site U1521 in the central Ross Sea derive from West Antarctica, requiring the presence of a WAIS covering most of the Ross Sea continental shelf. Seismic, lithological and palynological data reveal the intermittent proximity of grounded ice to Site U1521. The erosion rate calculated from this sediment package greatly exceeds the long-term mean, implying rapid erosion of West Antarctica. This interval therefore captures a key step in the genesis of a marine-based WAIS and a tipping point in Antarctic ice-sheet evolution. |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) |
format |
Article in Journal/Newspaper |
author |
Marschalek, J. Zurli, L. Talarico, F. van de Flierdt, T. Vermeesch, P. Carter, A. Beny, F. Bout-Roumazeilles, V. Sangiorgi, F. Hemming, S. Pérez, L. Colleoni, F. Prebble, J. van Peer, T. Perotti, M. Shevenell, A. Browne, I. Kulhanek, D. Levy, R. Harwood, D. Sullivan, N. Meyers, S. Griffith, E. Hillenbrand, C.-D. Gasson, E. Siegert, M. Keisling, B. Licht, K. Kuhn, G. Dodd, J. Boshuis, C. de Santis, L. Mckay, R. |
author_facet |
Marschalek, J. Zurli, L. Talarico, F. van de Flierdt, T. Vermeesch, P. Carter, A. Beny, F. Bout-Roumazeilles, V. Sangiorgi, F. Hemming, S. Pérez, L. Colleoni, F. Prebble, J. van Peer, T. Perotti, M. Shevenell, A. Browne, I. Kulhanek, D. Levy, R. Harwood, D. Sullivan, N. Meyers, S. Griffith, E. Hillenbrand, C.-D. Gasson, E. Siegert, M. Keisling, B. Licht, K. Kuhn, G. Dodd, J. Boshuis, C. de Santis, L. Mckay, R. |
author_sort |
Marschalek, J. |
title |
A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
title_short |
A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
title_full |
A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
title_fullStr |
A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
title_full_unstemmed |
A Large West Antarctic Ice Sheet Explains Early Neogene Sea-Level Amplitude |
title_sort |
large west antarctic ice sheet explains early neogene sea-level amplitude |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://sde.hal.science/hal-03796588 https://sde.hal.science/hal-03796588/document https://sde.hal.science/hal-03796588/file/Marschalek_Main_Final-1.pdf https://doi.org/10.1038/s41586-021-04148-0 |
geographic |
Antarctic East Antarctica Ross Sea West Antarctica West Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctica Ross Sea West Antarctica West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ross Sea West Antarctica |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://sde.hal.science/hal-03796588 Nature, 2021, 600 (7889), pp.450-455. ⟨10.1038/s41586-021-04148-0⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41586-021-04148-0 hal-03796588 https://sde.hal.science/hal-03796588 https://sde.hal.science/hal-03796588/document https://sde.hal.science/hal-03796588/file/Marschalek_Main_Final-1.pdf doi:10.1038/s41586-021-04148-0 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41586-021-04148-0 |
container_title |
Nature |
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7889 |
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450 |
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1802644178084036608 |