Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology
While thermochronological studies have constrained the landscape evolution of several of the crustal blocks of West and East Antarctica, the tectono-thermal evolution of the Ellsworth Mountains remains relatively poorly constrained. These mountains are among the crustal blocks that comprise West Ant...
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073310 2024-06-02T07:58:34+00:00 Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology Bastías-Silva, Joaquín Chew, David Poblete, Fernando Castillo, Paula Guenthner, William Grunow, Anne Dalziel, Ian W. D. Dias, Airton N. C. Ramírez de Arellano, Cristóbal Fernandez, Rodrigo 2024-04 electronic https://doi.org/10.5194/se-15-555-2024 https://noa.gwlb.de/receive/cop_mods_00073310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071483/se-15-555-2024.pdf https://se.copernicus.org/articles/15/555/2024/se-15-555-2024.pdf eng eng Copernicus Publications Solid Earth -- 1869-9529 https://doi.org/10.5194/se-15-555-2024 https://noa.gwlb.de/receive/cop_mods_00073310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071483/se-15-555-2024.pdf https://se.copernicus.org/articles/15/555/2024/se-15-555-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/se-15-555-2024 2024-05-07T02:17:27Z While thermochronological studies have constrained the landscape evolution of several of the crustal blocks of West and East Antarctica, the tectono-thermal evolution of the Ellsworth Mountains remains relatively poorly constrained. These mountains are among the crustal blocks that comprise West Antarctica and exhibit an exceptionally well-preserved Palaeozoic sedimentary sequence. Despite the seminal contribution of Fitzgerald and Stump (1991), who suggested an Early Cretaceous uplift event for the Ellsworth Mountains, further thermochronological studies are required to improve the current understanding of the landscape evolution of this mountain chain. We present new zircon (U–Th) / He (ZHe) ages, which provide insights into the landscape evolution of the Ellsworth Mountains. The ZHe ages collected from near the base and the top of the sequence suggest that these rocks underwent burial reheating after deposition. A cooling event is recorded during the Jurassic–Early Cretaceous, which we interpret as representing exhumation in response to rock uplift of the Ellsworth Mountains. Moreover, our results show that while ZHe ages at the base of the sequence are fully reset, towards the top ZHe ages are partially reset. Uplift and exhumation of the Ellsworth Mountains during the Jurassic–Early Cretaceous was contemporaneous with the rotation and translation of this crustal block with respect to East Antarctica and possibly the Antarctic Peninsula. Furthermore, this period is characterized by widespread extension associated with the disassembly and breakup of Gondwana, with the Ellsworth Mountains playing a key role in the opening of the far southern Atlantic. Based on these results, we suggest that uplift of the Ellsworth Mountains during the disassembly of Gondwana provides additional evidence for major rearrangement of the crustal blocks between the South American, African, Australian and Antarctic plates. Finally, uplift of the Ellsworth Mountains commenced during the Jurassic, which predates the Early Cretaceous ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica Niedersächsisches Online-Archiv NOA Antarctic The Antarctic Antarctic Peninsula East Antarctica West Antarctica Stump ENVELOPE(-153.167,-153.167,-86.183,-86.183) Fitzgerald ENVELOPE(-111.602,-111.602,59.850,59.850) Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Solid Earth 15 4 555 566 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Bastías-Silva, Joaquín Chew, David Poblete, Fernando Castillo, Paula Guenthner, William Grunow, Anne Dalziel, Ian W. D. Dias, Airton N. C. Ramírez de Arellano, Cristóbal Fernandez, Rodrigo Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
topic_facet |
article Verlagsveröffentlichung |
description |
While thermochronological studies have constrained the landscape evolution of several of the crustal blocks of West and East Antarctica, the tectono-thermal evolution of the Ellsworth Mountains remains relatively poorly constrained. These mountains are among the crustal blocks that comprise West Antarctica and exhibit an exceptionally well-preserved Palaeozoic sedimentary sequence. Despite the seminal contribution of Fitzgerald and Stump (1991), who suggested an Early Cretaceous uplift event for the Ellsworth Mountains, further thermochronological studies are required to improve the current understanding of the landscape evolution of this mountain chain. We present new zircon (U–Th) / He (ZHe) ages, which provide insights into the landscape evolution of the Ellsworth Mountains. The ZHe ages collected from near the base and the top of the sequence suggest that these rocks underwent burial reheating after deposition. A cooling event is recorded during the Jurassic–Early Cretaceous, which we interpret as representing exhumation in response to rock uplift of the Ellsworth Mountains. Moreover, our results show that while ZHe ages at the base of the sequence are fully reset, towards the top ZHe ages are partially reset. Uplift and exhumation of the Ellsworth Mountains during the Jurassic–Early Cretaceous was contemporaneous with the rotation and translation of this crustal block with respect to East Antarctica and possibly the Antarctic Peninsula. Furthermore, this period is characterized by widespread extension associated with the disassembly and breakup of Gondwana, with the Ellsworth Mountains playing a key role in the opening of the far southern Atlantic. Based on these results, we suggest that uplift of the Ellsworth Mountains during the disassembly of Gondwana provides additional evidence for major rearrangement of the crustal blocks between the South American, African, Australian and Antarctic plates. Finally, uplift of the Ellsworth Mountains commenced during the Jurassic, which predates the Early Cretaceous ... |
format |
Article in Journal/Newspaper |
author |
Bastías-Silva, Joaquín Chew, David Poblete, Fernando Castillo, Paula Guenthner, William Grunow, Anne Dalziel, Ian W. D. Dias, Airton N. C. Ramírez de Arellano, Cristóbal Fernandez, Rodrigo |
author_facet |
Bastías-Silva, Joaquín Chew, David Poblete, Fernando Castillo, Paula Guenthner, William Grunow, Anne Dalziel, Ian W. D. Dias, Airton N. C. Ramírez de Arellano, Cristóbal Fernandez, Rodrigo |
author_sort |
Bastías-Silva, Joaquín |
title |
Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
title_short |
Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
title_full |
Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
title_fullStr |
Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
title_full_unstemmed |
Uplift and denudation history of the Ellsworth Mountains: insights from low-temperature thermochronology |
title_sort |
uplift and denudation history of the ellsworth mountains: insights from low-temperature thermochronology |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/se-15-555-2024 https://noa.gwlb.de/receive/cop_mods_00073310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071483/se-15-555-2024.pdf https://se.copernicus.org/articles/15/555/2024/se-15-555-2024.pdf |
long_lat |
ENVELOPE(-153.167,-153.167,-86.183,-86.183) ENVELOPE(-111.602,-111.602,59.850,59.850) ENVELOPE(-85.000,-85.000,-78.750,-78.750) |
geographic |
Antarctic The Antarctic Antarctic Peninsula East Antarctica West Antarctica Stump Fitzgerald Ellsworth Mountains |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula East Antarctica West Antarctica Stump Fitzgerald Ellsworth Mountains |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica West Antarctica |
op_relation |
Solid Earth -- 1869-9529 https://doi.org/10.5194/se-15-555-2024 https://noa.gwlb.de/receive/cop_mods_00073310 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071483/se-15-555-2024.pdf https://se.copernicus.org/articles/15/555/2024/se-15-555-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/se-15-555-2024 |
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15 |
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4 |
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555 |
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