New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina

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 phylli...

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Autores principales: Carrasquero, Silvia Irene, Rubinstein, Nora Alicia, Gómez, Anabel, Chiaradia, Massimo, Fontignie, Dénis, Valencia, Victor A.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Geología
Ciencias Naturales
Adakitic signal
Backarc
Central andes
Petrogenesis
Porphyry copper deposits
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102589
https://ri.conicet.gov.ar/11336/65464
http://linkinghub.elsevier.com/retrieve/pii/S1674987117301755
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-102589
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Ciencias Naturales
Adakitic signal
Backarc
Central andes
Petrogenesis
Porphyry copper deposits
spellingShingle Geología
Ciencias Naturales
Adakitic signal
Backarc
Central andes
Petrogenesis
Porphyry copper deposits
Carrasquero, Silvia Irene
Rubinstein, Nora Alicia
Gómez, Anabel
Chiaradia, Massimo
Fontignie, Dénis
Valencia, Victor A.
New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
topic_facet Geología
Ciencias Naturales
Adakitic signal
Backarc
Central andes
Petrogenesis
Porphyry copper deposits
description 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.
format Articulo
Preprint
author Carrasquero, Silvia Irene
Rubinstein, Nora Alicia
Gómez, Anabel
Chiaradia, Massimo
Fontignie, Dénis
Valencia, Victor A.
author_facet Carrasquero, Silvia Irene
Rubinstein, Nora Alicia
Gómez, Anabel
Chiaradia, Massimo
Fontignie, Dénis
Valencia, Victor A.
author_sort Carrasquero, Silvia Irene
title New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
title_short New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
title_full New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
title_fullStr New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
title_full_unstemmed New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina
title_sort new insights into petrogenesis of miocene magmatism associated with porphyry copper deposits of the andean pampean flat slab, argentina
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/102589
https://ri.conicet.gov.ar/11336/65464
http://linkinghub.elsevier.com/retrieve/pii/S1674987117301755
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