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Abstract:

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.

Registro:

Documento: Artículo
Título:Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts
Autor:Zaffarana, C.B.; Lagorio, S.L.; Somoza, R.
Filiación:Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160, Capital Federal, Buenos Aires, Argentina
Servicio Geológico Minero Argentino (SEGEMAR), Av. Julio Argentino Roca 651, C1067ABB Capital Federal, Buenos Aires, Argentina
Instituto de Geociencias Básicas, Aplicadas y Ambientales (IGEBA), Ciudad Universitaria, Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET), Intendente Guiraldes 2160, Pabellon II (C1428EGA), Capital Federal, Buenos Aires, Argentina
Palabras clave: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
Año:2012
Volumen:39
Número:1
Página de inicio:53
Página de fin:66
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana

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Citas:

---------- APA ----------
Zaffarana, C.B., Lagorio, S.L. & Somoza, R. (2012) . Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts . Andean Geology, 39(1), 53-66.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana [ ]
---------- CHICAGO ----------
Zaffarana, C.B., Lagorio, S.L., Somoza, R. "Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts " . Andean Geology 39, no. 1 (2012) : 53-66.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana [ ]
---------- MLA ----------
Zaffarana, C.B., Lagorio, S.L., Somoza, R. "Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts " . Andean Geology, vol. 39, no. 1, 2012, pp. 53-66.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana [ ]
---------- VANCOUVER ----------
Zaffarana, C.B., Lagorio, S.L., Somoza, R. Paleomagnetism and geochemistry from the Upper Cretaceous Tres Picos Prieto locality (43°S), Patagonian Plateau Basalts . Andean Geol. 2012;39(1):53-66.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n1_p53_Zaffarana [ ]