Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana

Paleomagnetic investigation in the Deseado Massif, southern Patagonia, suggests that Triassic sedimentary rocks carry a latest Triassic to Jurassic remagnetization and that earliest Jurassic plutonic complexes carry a reversed polarity magnetization of thermoremanent origin. Despite uncertainties in...

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Autores principales:	Somoza, R., Vizán, H., Taylor, G.K.
Formato:	JOUR
Materias:	Gondwana breakup Jurassic Paleomagnetism Patagonia apparent polar wander path continental breakup crustal structure deformation Gondwana paleomagnetism remagnetization sedimentary rock tectonic evolution tectonic structure Triassic South America
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00401951_v460_n1-4_p178_Somoza
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00401951_v460_n1-4_p178_Somoza
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spelling	todo:paper_00401951_v460_n1-4_p178_Somoza2023-10-03T14:50:13Z Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana Somoza, R. Vizán, H. Taylor, G.K. Gondwana breakup Jurassic Paleomagnetism Patagonia apparent polar wander path continental breakup crustal structure deformation Gondwana Jurassic paleomagnetism remagnetization sedimentary rock tectonic evolution tectonic structure Triassic Patagonia South America Paleomagnetic investigation in the Deseado Massif, southern Patagonia, suggests that Triassic sedimentary rocks carry a latest Triassic to Jurassic remagnetization and that earliest Jurassic plutonic complexes carry a reversed polarity magnetization of thermoremanent origin. Despite uncertainties in the timing of the observed remanence in the Triassic rocks and the lack of paleohorizontal control on the plutonic complexes, comparison of the derived pole positions with the most reliable Late Triassic-Jurassic apparent polar wander paths indicates that the study areas underwent significant clockwise vertical-axis rotation. In contrast, paleomagnetic results from mid-Cretaceous rocks in the region indicate no rotation. The observed crustal rotations in the Deseado Massif are thus bracketed to have occurred between Jurassic and Early Cretaceous times, documenting southern Patagonian deformation during the breakup of Western Gondwana and then enlarging the regional record of clockwise rotations associated with this event. These results suggest a more complex than previously supposed tectonic evolution of this part of South America. © 2008 Elsevier B.V. All rights reserved. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vizán, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v460_n1-4_p178_Somoza
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Gondwana breakup Jurassic Paleomagnetism Patagonia apparent polar wander path continental breakup crustal structure deformation Gondwana Jurassic paleomagnetism remagnetization sedimentary rock tectonic evolution tectonic structure Triassic Patagonia South America
spellingShingle	Gondwana breakup Jurassic Paleomagnetism Patagonia apparent polar wander path continental breakup crustal structure deformation Gondwana Jurassic paleomagnetism remagnetization sedimentary rock tectonic evolution tectonic structure Triassic Patagonia South America Somoza, R. Vizán, H. Taylor, G.K. Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
topic_facet	Gondwana breakup Jurassic Paleomagnetism Patagonia apparent polar wander path continental breakup crustal structure deformation Gondwana Jurassic paleomagnetism remagnetization sedimentary rock tectonic evolution tectonic structure Triassic Patagonia South America
description	Paleomagnetic investigation in the Deseado Massif, southern Patagonia, suggests that Triassic sedimentary rocks carry a latest Triassic to Jurassic remagnetization and that earliest Jurassic plutonic complexes carry a reversed polarity magnetization of thermoremanent origin. Despite uncertainties in the timing of the observed remanence in the Triassic rocks and the lack of paleohorizontal control on the plutonic complexes, comparison of the derived pole positions with the most reliable Late Triassic-Jurassic apparent polar wander paths indicates that the study areas underwent significant clockwise vertical-axis rotation. In contrast, paleomagnetic results from mid-Cretaceous rocks in the region indicate no rotation. The observed crustal rotations in the Deseado Massif are thus bracketed to have occurred between Jurassic and Early Cretaceous times, documenting southern Patagonian deformation during the breakup of Western Gondwana and then enlarging the regional record of clockwise rotations associated with this event. These results suggest a more complex than previously supposed tectonic evolution of this part of South America. © 2008 Elsevier B.V. All rights reserved.
format	JOUR
author	Somoza, R. Vizán, H. Taylor, G.K.
author_facet	Somoza, R. Vizán, H. Taylor, G.K.
author_sort	Somoza, R.
title	Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
title_short	Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
title_full	Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
title_fullStr	Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
title_full_unstemmed	Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana
title_sort	tectonic rotations in the deseado massif, southern patagonia, during the breakup of western gondwana
url	http://hdl.handle.net/20.500.12110/paper_00401951_v460_n1-4_p178_Somoza
work_keys_str_mv	AT somozar tectonicrotationsinthedeseadomassifsouthernpatagoniaduringthebreakupofwesterngondwana AT vizanh tectonicrotationsinthedeseadomassifsouthernpatagoniaduringthebreakupofwesterngondwana AT taylorgk tectonicrotationsinthedeseadomassifsouthernpatagoniaduringthebreakupofwesterngondwana
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Tectonic rotations in the Deseado Massif, southern Patagonia, during the breakup of Western Gondwana

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