Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts

A paleomagnetic study on nine samples from lavas from the Upper Cretaceous Tres Picos Prieto locality (43°50'S and 70°3'W), Patagonian Plateau Basaltic Province, revealed that a ca. 300 m thick pile of basalts accumulated during three discrete (i.e., temporally separated) volcanic episodes...

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Autores principales:	Zaffarana, Claudia Beatriz, Lagorio, Silvia Leonor, Somoza, Ruben
Publicado:	2012
Materias:	Argentina Geochemistry Late Cretaceous Paleomagnetism Patagonian Plateau Basaltic Province basalt Cretaceous geoaccumulation geochemistry intraplate process lava magmatism outcrop paleomagnetism petrogenesis subduction zone tectonic setting Patagonia
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana http://hdl.handle.net/20.500.12110/paper_07187092_v39_n1_p53_Zaffarana
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_07187092_v39_n1_p53_Zaffarana
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spelling	paper:paper_07187092_v39_n1_p53_Zaffarana2023-06-08T15:43:12Z Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts Zaffarana, Claudia Beatriz Lagorio, Silvia Leonor Somoza, Ruben Argentina Geochemistry Late Cretaceous Paleomagnetism Patagonian Plateau Basaltic Province basalt Cretaceous geoaccumulation geochemistry intraplate process lava magmatism outcrop paleomagnetism petrogenesis subduction zone tectonic setting Argentina Patagonia A paleomagnetic study on nine samples from lavas from the Upper Cretaceous Tres Picos Prieto locality (43°50'S and 70°3'W), Patagonian Plateau Basaltic Province, revealed that a ca. 300 m thick pile of basalts accumulated during three discrete (i.e., temporally separated) volcanic episodes. The chemistry of these lavas shows characteristics compatible with both subduction and intraplate magmatism, with the former having a more important contribution in the younger lavas. Overall, we interpret these rocks to be transitional basalts generated in a supra-subduction environment. The Late Cretaceous to Cenozoic Patagonian Plateau Basaltic Province crops out from eastern Patagonia to the cordillera, and their genesis have been associated with different tectonic processes, even for spatially separated rocks of the same age. Considering that the development of the magmatic province is contemporary with the stage of westward drift of South America, we propose that magma generation and upwelling due to rapidly shearing asthenosphere inducing circulatory flow associated to asperities in the lithosphere-asthenosphere interface (shear-driven upwelling) can be evaluated as a further potential mechanism to account for many outcrops of these backarc to intraplate lavas. Fil:Zaffarana, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lagorio, S.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana http://hdl.handle.net/20.500.12110/paper_07187092_v39_n1_p53_Zaffarana
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Geochemistry Late Cretaceous Paleomagnetism Patagonian Plateau Basaltic Province basalt Cretaceous geoaccumulation geochemistry intraplate process lava magmatism outcrop paleomagnetism petrogenesis subduction zone tectonic setting Argentina Patagonia
spellingShingle	Argentina Geochemistry Late Cretaceous Paleomagnetism Patagonian Plateau Basaltic Province basalt Cretaceous geoaccumulation geochemistry intraplate process lava magmatism outcrop paleomagnetism petrogenesis subduction zone tectonic setting Argentina Patagonia Zaffarana, Claudia Beatriz Lagorio, Silvia Leonor Somoza, Ruben Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
topic_facet	Argentina Geochemistry Late Cretaceous Paleomagnetism Patagonian Plateau Basaltic Province basalt Cretaceous geoaccumulation geochemistry intraplate process lava magmatism outcrop paleomagnetism petrogenesis subduction zone tectonic setting Argentina Patagonia
description	A paleomagnetic study on nine samples from lavas from the Upper Cretaceous Tres Picos Prieto locality (43°50'S and 70°3'W), Patagonian Plateau Basaltic Province, revealed that a ca. 300 m thick pile of basalts accumulated during three discrete (i.e., temporally separated) volcanic episodes. The chemistry of these lavas shows characteristics compatible with both subduction and intraplate magmatism, with the former having a more important contribution in the younger lavas. Overall, we interpret these rocks to be transitional basalts generated in a supra-subduction environment. The Late Cretaceous to Cenozoic Patagonian Plateau Basaltic Province crops out from eastern Patagonia to the cordillera, and their genesis have been associated with different tectonic processes, even for spatially separated rocks of the same age. Considering that the development of the magmatic province is contemporary with the stage of westward drift of South America, we propose that magma generation and upwelling due to rapidly shearing asthenosphere inducing circulatory flow associated to asperities in the lithosphere-asthenosphere interface (shear-driven upwelling) can be evaluated as a further potential mechanism to account for many outcrops of these backarc to intraplate lavas.
author	Zaffarana, Claudia Beatriz Lagorio, Silvia Leonor Somoza, Ruben
author_facet	Zaffarana, Claudia Beatriz Lagorio, Silvia Leonor Somoza, Ruben
author_sort	Zaffarana, Claudia Beatriz
title	Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
title_short	Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
title_full	Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
title_fullStr	Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
title_full_unstemmed	Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
title_sort	paleomagnetism and geochemistry from the upper cretaceous tres picos prieto locality (43°s), patagonian plateau basalts
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana http://hdl.handle.net/20.500.12110/paper_07187092_v39_n1_p53_Zaffarana
work_keys_str_mv	AT zaffaranaclaudiabeatriz paleomagnetismandgeochemistryfromtheuppercretaceoustrespicosprietolocality43spatagonianplateaubasalts AT lagoriosilvialeonor paleomagnetismandgeochemistryfromtheuppercretaceoustrespicosprietolocality43spatagonianplateaubasalts AT somozaruben paleomagnetismandgeochemistryfromtheuppercretaceoustrespicosprietolocality43spatagonianplateaubasalts
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Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts

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