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Abstract:

The Paramillos de Uspallata mining district located in the backarc region of the Pampean flat-slab segment (28°–33°S) features porphyry-type deposits genetically associated with Middle Miocene volcanics. This mineralizing magmatism comprising hydrothermally altered (sodic-calcic, potassic and phyllic alteration) subvolcanic and pyroclastic rocks of andesite-basaltic andesite and dacite-rhyolite composition with a typical arc signature, represents the eastward broadening of the Farellones arc by ∼17 Ma. Its geochemistry also reveals a residual mineralogy of amphibole ± garnet with limited plagioclase fractionation resulting in an adakitic signal; however, according to the isotopic data collected in our study, the contributions of MASH (melting-assimilation-storage-homogenization) processes in the acquisition of this signal cannot be disregarded. Both the broadening of the Farellones arc and its residual mineralogy – typical of relatively deep magmatic chambers – are consistent with a slab shallowing and outcoming crustal thickening setting. This tectonic scenario could be interpreted as a result of an early effect of the Juan Fernandez Ridge collision that was further to the north by ∼17 Ma. Our findings suggest that magmas were fertile for porphyry type deposits during the early stages of the slab shallowing. © 2017 China University of Geosciences (Beijing) and Peking University

Registro:

Documento: Artículo
Título:New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
Autor:Carrasquero, S.I.; Rubinstein, N.A.; Gómez, A.L.R.; Chiaradia, M.; Fontignie, D.; Valencia, V.A.
Filiación:Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina
Instituto de Geociencias básicas, aplicadas y ambientales de Buenos Aires (IgeBA), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos-CONICET, Argentina
Department of Earth Sciences, University of Geneva, Switzerland
School of Earth and Environmental Sciences Faculty, Washington State University, United States
Palabras clave:Adakitic signal; Backarc; Central Andes; Petrogenesis; Porphyry copper deposits; backarc basin; copper; crustal thickness; magmatism; mining; Miocene; ore deposit; petrogenesis; porphyry; Andes; Argentina; Sierras Pampeanas
Año:2018
Volumen:9
Número:5
Página de inicio:1565
Página de fin:1576
DOI: http://dx.doi.org/10.1016/j.gsf.2017.10.009
Título revista:Geoscience Frontiers
Título revista abreviado:Geosci. Front.
ISSN:16749871
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16749871_v9_n5_p1565_Carrasquero

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Citas:

---------- APA ----------
Carrasquero, S.I., Rubinstein, N.A., Gómez, A.L.R., Chiaradia, M., Fontignie, D. & Valencia, V.A. (2018) . New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina. Geoscience Frontiers, 9(5), 1565-1576.
http://dx.doi.org/10.1016/j.gsf.2017.10.009
---------- CHICAGO ----------
Carrasquero, S.I., Rubinstein, N.A., Gómez, A.L.R., Chiaradia, M., Fontignie, D., Valencia, V.A. "New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina" . Geoscience Frontiers 9, no. 5 (2018) : 1565-1576.
http://dx.doi.org/10.1016/j.gsf.2017.10.009
---------- MLA ----------
Carrasquero, S.I., Rubinstein, N.A., Gómez, A.L.R., Chiaradia, M., Fontignie, D., Valencia, V.A. "New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina" . Geoscience Frontiers, vol. 9, no. 5, 2018, pp. 1565-1576.
http://dx.doi.org/10.1016/j.gsf.2017.10.009
---------- VANCOUVER ----------
Carrasquero, S.I., Rubinstein, N.A., Gómez, A.L.R., Chiaradia, M., Fontignie, D., Valencia, V.A. New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina. Geosci. Front. 2018;9(5):1565-1576.
http://dx.doi.org/10.1016/j.gsf.2017.10.009