Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data
The lack of preserved Mesozoic–Cenozoic sediments and structures in central Dronning Maud Land has so far limited our understanding of the post-Pan-African evolution of this important part of East Antarctica. In order to investigate the thermal evolution of the basement rocks and place constraints o...
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ftmdpi:oai:mdpi.com:/2076-3263/8/11/390/ 2023-08-20T04:01:25+02:00 Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data Hallgeir Sirevaag Anna K. Ksienzyk Joachim Jacobs István Dunkl Andreas Läufer agris 2018-10-26 application/pdf https://doi.org/10.3390/geosciences8110390 EN eng Multidisciplinary Digital Publishing Institute Structural Geology and Tectonics https://dx.doi.org/10.3390/geosciences8110390 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 8; Issue 11; Pages: 390 apatite fission track (U-Th)/He low-temperature thermochronology thermal modelling passive margin Gondwana rifting Text 2018 ftmdpi https://doi.org/10.3390/geosciences8110390 2023-07-31T21:48:20Z The lack of preserved Mesozoic–Cenozoic sediments and structures in central Dronning Maud Land has so far limited our understanding of the post-Pan-African evolution of this important part of East Antarctica. In order to investigate the thermal evolution of the basement rocks and place constraints on landscape evolution, we present new low-temperature thermochronological data from 34 samples. Apatite fission track ages range from 280–85 Ma, while single-grain (U-Th)/He ages from apatite and zircon range from 305–15 and 420–340 Ma, respectively. Our preferred thermal history models suggest late Paleozoic–early Mesozoic peneplanation and subsequent burial by 3–6 km of Beacon sediments. The samples experienced no additional burial in the Jurassic, thus the once voluminous continental flood basalts of western Dronning Maud Land did not reach central Dronning Maud Land. Mesozoic–early Cenozoic cooling of the samples was slow. Contrary to western Dronning Maud Land, central Dronning Maud Land lacks a mid-Cretaceous cooling phase. We therefore suggest that the mid-Cretaceous cooling of western Dronning Maud Land should be attributed to the proximity to the collapse of the orogenic plateau at the Panthalassic margin of Gondwana. Cooling rates accelerated considerably with the onset of glaciation at 34 Ma, due to climate deterioration and glacial denudation of up to 2 km. Text Antarc* Antarctica Dronning Maud Land East Antarctica MDPI Open Access Publishing East Antarctica Dronning Maud Land Geosciences 8 11 390 |
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Open Polar |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
topic |
apatite fission track (U-Th)/He low-temperature thermochronology thermal modelling passive margin Gondwana rifting |
spellingShingle |
apatite fission track (U-Th)/He low-temperature thermochronology thermal modelling passive margin Gondwana rifting Hallgeir Sirevaag Anna K. Ksienzyk Joachim Jacobs István Dunkl Andreas Läufer Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
topic_facet |
apatite fission track (U-Th)/He low-temperature thermochronology thermal modelling passive margin Gondwana rifting |
description |
The lack of preserved Mesozoic–Cenozoic sediments and structures in central Dronning Maud Land has so far limited our understanding of the post-Pan-African evolution of this important part of East Antarctica. In order to investigate the thermal evolution of the basement rocks and place constraints on landscape evolution, we present new low-temperature thermochronological data from 34 samples. Apatite fission track ages range from 280–85 Ma, while single-grain (U-Th)/He ages from apatite and zircon range from 305–15 and 420–340 Ma, respectively. Our preferred thermal history models suggest late Paleozoic–early Mesozoic peneplanation and subsequent burial by 3–6 km of Beacon sediments. The samples experienced no additional burial in the Jurassic, thus the once voluminous continental flood basalts of western Dronning Maud Land did not reach central Dronning Maud Land. Mesozoic–early Cenozoic cooling of the samples was slow. Contrary to western Dronning Maud Land, central Dronning Maud Land lacks a mid-Cretaceous cooling phase. We therefore suggest that the mid-Cretaceous cooling of western Dronning Maud Land should be attributed to the proximity to the collapse of the orogenic plateau at the Panthalassic margin of Gondwana. Cooling rates accelerated considerably with the onset of glaciation at 34 Ma, due to climate deterioration and glacial denudation of up to 2 km. |
format |
Text |
author |
Hallgeir Sirevaag Anna K. Ksienzyk Joachim Jacobs István Dunkl Andreas Läufer |
author_facet |
Hallgeir Sirevaag Anna K. Ksienzyk Joachim Jacobs István Dunkl Andreas Läufer |
author_sort |
Hallgeir Sirevaag |
title |
Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
title_short |
Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
title_full |
Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
title_fullStr |
Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
title_full_unstemmed |
Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data |
title_sort |
tectono-thermal evolution and morphodynamics of the central dronning maud land mountains, east antarctica, based on new thermochronological data |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8110390 |
op_coverage |
agris |
geographic |
East Antarctica Dronning Maud Land |
geographic_facet |
East Antarctica Dronning Maud Land |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica |
op_source |
Geosciences; Volume 8; Issue 11; Pages: 390 |
op_relation |
Structural Geology and Tectonics https://dx.doi.org/10.3390/geosciences8110390 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences8110390 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
11 |
container_start_page |
390 |
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1774724701346594816 |