Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica
International audience; The Admiralty Mountains region forms the northern termination of the northern Victoria Land, Antarctica. Few quantitative data are available to reconstruct the Cenozoic morpho-tectonic evolution of this sector of the Antarctic plate, where the Admiralty Mountains region forms...
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ftopenaccessrep:oai:zenodo.org:36108 2023-05-15T13:50:37+02:00 Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica XU, Zhaokai WAN, Shiming Colin, Christophe Li, Tiegang Clift, Peter Chang, Fengming Sun, Rongtao YU, Zhaojie Lim, Dhongil 2020-03-01 https://www.openaccessrepository.it/record/36108 https://doi.org/10.1016/j.gsf.2020.01.018 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/36108 doi:10.1016/j.gsf.2020.01.018 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Digital Humanities and Cultural Heritage General Earth and Planetary Sciences info:eu-repo/semantics/article publication-article 2020 ftopenaccessrep https://doi.org/10.1016/j.gsf.2020.01.018 2022-11-23T06:44:23Z International audience; The Admiralty Mountains region forms the northern termination of the northern Victoria Land, Antarctica. Few quantitative data are available to reconstruct the Cenozoic morpho-tectonic evolution of this sector of the Antarctic plate, where the Admiralty Mountains region forms the northern termination of the western shoulder of the Mesozoic-Cenozoic West Antarctica Rift System. In this study we combine new low-temperature thermochronological data (apatite fission-track and (U-Th-Sm)/He analyses) with structural and topography analysis. The regional pattern of the fission-track ages shows a general tendency to older ages (80–60 Ma) associated with shortened mean track-lengths in the interior, and younger fission-track ages clustering at 38–26 Ma with long mean track-lengths in the coastal region. Differently from other regions of Victoria Land, the younger ages are found as far as 50–70 km inland. Single grain apatite (U-Th-Sm)/He ages cluster at 50–30 Ma with younger ages in the coastal domain. Topography analysis reveals that the Admiralty Mountains has high local relief, with an area close to the coast, 180 km long and 70 km large, having the highest local relief of >2500 m. This coincides with the location of the youngest fission-track ages. The shape of the area with highest local relief matches the shape of a recently detected low velocity zone beneath the northern TAM, indicating that high topography of the Admiralty Mountains region is likely sustained by a mantle thermal anomaly. We used the obtained constraints on the amount of removed crustal section to reconstruct back-eroded profiles and calculate the erosional load in order to test flexural uplift models. We found that our back-eroded profiles are better reproduced by a constant elastic thickness of intermediate values (Te = 20–30 km). This suggests that, beneath the Admiralty Mountains, the elastic properties of the lithosphere are different with respect to other TAM sectors, likely due to a stationary Cenozoic upper ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Victoria Land West Antarctica Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Antarctic The Antarctic West Antarctica Victoria Land Admiralty Mountains ENVELOPE(168.762,168.762,-71.788,-71.788) Geoscience Frontiers 11 5 1841 1858 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
Digital Humanities and Cultural Heritage General Earth and Planetary Sciences |
spellingShingle |
Digital Humanities and Cultural Heritage General Earth and Planetary Sciences XU, Zhaokai WAN, Shiming Colin, Christophe Li, Tiegang Clift, Peter Chang, Fengming Sun, Rongtao YU, Zhaojie Lim, Dhongil Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
topic_facet |
Digital Humanities and Cultural Heritage General Earth and Planetary Sciences |
description |
International audience; The Admiralty Mountains region forms the northern termination of the northern Victoria Land, Antarctica. Few quantitative data are available to reconstruct the Cenozoic morpho-tectonic evolution of this sector of the Antarctic plate, where the Admiralty Mountains region forms the northern termination of the western shoulder of the Mesozoic-Cenozoic West Antarctica Rift System. In this study we combine new low-temperature thermochronological data (apatite fission-track and (U-Th-Sm)/He analyses) with structural and topography analysis. The regional pattern of the fission-track ages shows a general tendency to older ages (80–60 Ma) associated with shortened mean track-lengths in the interior, and younger fission-track ages clustering at 38–26 Ma with long mean track-lengths in the coastal region. Differently from other regions of Victoria Land, the younger ages are found as far as 50–70 km inland. Single grain apatite (U-Th-Sm)/He ages cluster at 50–30 Ma with younger ages in the coastal domain. Topography analysis reveals that the Admiralty Mountains has high local relief, with an area close to the coast, 180 km long and 70 km large, having the highest local relief of >2500 m. This coincides with the location of the youngest fission-track ages. The shape of the area with highest local relief matches the shape of a recently detected low velocity zone beneath the northern TAM, indicating that high topography of the Admiralty Mountains region is likely sustained by a mantle thermal anomaly. We used the obtained constraints on the amount of removed crustal section to reconstruct back-eroded profiles and calculate the erosional load in order to test flexural uplift models. We found that our back-eroded profiles are better reproduced by a constant elastic thickness of intermediate values (Te = 20–30 km). This suggests that, beneath the Admiralty Mountains, the elastic properties of the lithosphere are different with respect to other TAM sectors, likely due to a stationary Cenozoic upper ... |
format |
Article in Journal/Newspaper |
author |
XU, Zhaokai WAN, Shiming Colin, Christophe Li, Tiegang Clift, Peter Chang, Fengming Sun, Rongtao YU, Zhaojie Lim, Dhongil |
author_facet |
XU, Zhaokai WAN, Shiming Colin, Christophe Li, Tiegang Clift, Peter Chang, Fengming Sun, Rongtao YU, Zhaojie Lim, Dhongil |
author_sort |
XU, Zhaokai |
title |
Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
title_short |
Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
title_full |
Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
title_fullStr |
Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
title_full_unstemmed |
Topography, structural and exhumation history of the Admiralty Mountains region, northern Victoria Land, Antarctica |
title_sort |
topography, structural and exhumation history of the admiralty mountains region, northern victoria land, antarctica |
publishDate |
2020 |
url |
https://www.openaccessrepository.it/record/36108 https://doi.org/10.1016/j.gsf.2020.01.018 |
long_lat |
ENVELOPE(168.762,168.762,-71.788,-71.788) |
geographic |
Antarctic The Antarctic West Antarctica Victoria Land Admiralty Mountains |
geographic_facet |
Antarctic The Antarctic West Antarctica Victoria Land Admiralty Mountains |
genre |
Antarc* Antarctic Antarctica Victoria Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Victoria Land West Antarctica |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/36108 doi:10.1016/j.gsf.2020.01.018 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.gsf.2020.01.018 |
container_title |
Geoscience Frontiers |
container_volume |
11 |
container_issue |
5 |
container_start_page |
1841 |
op_container_end_page |
1858 |
_version_ |
1766253777862524928 |