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, C.B., Lagorio, S.L., Somoza, R.
Formato: JOUR
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: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 todo:paper_07187092_v39_n1_p53_Zaffarana
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spelling todo:paper_07187092_v39_n1_p53_Zaffarana2023-10-03T15:36:38Z Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts Zaffarana, C.B. Lagorio, S.L. Somoza, R. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, C.B.
Lagorio, S.L.
Somoza, R.
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.
format JOUR
author Zaffarana, C.B.
Lagorio, S.L.
Somoza, R.
author_facet Zaffarana, C.B.
Lagorio, S.L.
Somoza, R.
author_sort Zaffarana, C.B.
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
url http://hdl.handle.net/20.500.12110/paper_07187092_v39_n1_p53_Zaffarana
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AT lagoriosl paleomagnetismandgeochemistryfromtheuppercretaceoustrespicosprietolocality43spatagonianplateaubasalts
AT somozar paleomagnetismandgeochemistryfromtheuppercretaceoustrespicosprietolocality43spatagonianplateaubasalts
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