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, S.I., Rubinstein, N.A., Gómez, A.L.R., Chiaradia, M., Fontignie, D., Valencia, V.A.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16749871_v9_n5_p1565_Carrasquero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_16749871_v9_n5_p1565_Carrasquero
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spelling todo:paper_16749871_v9_n5_p1565_Carrasquero2023-10-03T16:29:37Z New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab, Argentina Carrasquero, S.I. Rubinstein, N.A. Gómez, A.L.R. Chiaradia, M. Fontignie, D. Valencia, V.A. 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 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 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16749871_v9_n5_p1565_Carrasquero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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
topic_facet 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
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. © 2017 China University of Geosciences (Beijing) and Peking University
format JOUR
author Carrasquero, S.I.
Rubinstein, N.A.
Gómez, A.L.R.
Chiaradia, M.
Fontignie, D.
Valencia, V.A.
author_facet Carrasquero, S.I.
Rubinstein, N.A.
Gómez, A.L.R.
Chiaradia, M.
Fontignie, D.
Valencia, V.A.
author_sort Carrasquero, S.I.
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
url http://hdl.handle.net/20.500.12110/paper_16749871_v9_n5_p1565_Carrasquero
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