Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province

Gualcamayo mining district (68°38'26"W, 29°43'10" S) is located in the Central Precordillera, in the northeast of San Juan province. This sector is characterized by carbonate and sedimentary rocks of Ordovician-Permian age. This sequence is intruded by Miocene dacites and tonalit...

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Autores principales: D'Annunzio, M.C., Rubinstein, N.
Formato: JOUR
Materias:
Central Precordillera
Gold mineralization
Low-sulphidation
San Juan
Tectonic breccias
breccia
carbonate
Carlin-type deposit
clast
dacite
gold mine
marcasite
mineralization
ore body
pyrite
sedimentary rock
sphalerite
texture
tonalite
Argentina
Precordillera
San Juan [Argentina]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p542_DAnnunzio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v70_n4_p542_DAnnunzio
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spelling todo:paper_00044822_v70_n4_p542_DAnnunzio2023-10-03T13:59:02Z Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province D'Annunzio, M.C. Rubinstein, N. Central Precordillera Gold mineralization Low-sulphidation San Juan Tectonic breccias breccia carbonate Carlin-type deposit clast dacite gold mine marcasite mineralization ore body pyrite sedimentary rock sphalerite texture tonalite Argentina Precordillera San Juan [Argentina] Gualcamayo mining district (68°38'26"W, 29°43'10" S) is located in the Central Precordillera, in the northeast of San Juan province. This sector is characterized by carbonate and sedimentary rocks of Ordovician-Permian age. This sequence is intruded by Miocene dacites and tonalites rocks. The district includes three deposits: Quebrada del Diablo Main, Amelia Ines-Magdalena and Quebrada del Diablo Lower West. Quebrada del Diablo Main is a Carlin-type deposit which is mined as an open pit. Amelia Inés-Magdalena is an iron, molybdenum, copper, zinc, lead and gold deposit, associated to magnesian skarns. Quebrada del Diablo Lower West is a blind ore body located between 500 and 600 metres deep. In Quebrada del Diablo Lower West, the gold mineralization is hosted by breccias with an wide variation in composition and relative abundance of clasts, matrix and cement, as well as the size of the clasts. The textural analysis of the mineralized breccias from Quebrada del Diablo Lower West suggests a tectonic origin. The mineral assemblage of pyrite, sphalerite and gold indicates low-sulphidation conditions and neutral to alkaline pH. The overprinted marcasite suggests a decrease in the concentration of sulfur in the mineralizing fluids. Later calcite veins with realgar, orpiment and gold indicate an increasing arsenic activity in the hydrothermal system. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p542_DAnnunzio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Central Precordillera
Gold mineralization
Low-sulphidation
San Juan
Tectonic breccias
breccia
carbonate
Carlin-type deposit
clast
dacite
gold mine
marcasite
mineralization
ore body
pyrite
sedimentary rock
sphalerite
texture
tonalite
Argentina
Precordillera
San Juan [Argentina]
spellingShingle Central Precordillera
Gold mineralization
Low-sulphidation
San Juan
Tectonic breccias
breccia
carbonate
Carlin-type deposit
clast
dacite
gold mine
marcasite
mineralization
ore body
pyrite
sedimentary rock
sphalerite
texture
tonalite
Argentina
Precordillera
San Juan [Argentina]
D'Annunzio, M.C.
Rubinstein, N.
Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
topic_facet Central Precordillera
Gold mineralization
Low-sulphidation
San Juan
Tectonic breccias
breccia
carbonate
Carlin-type deposit
clast
dacite
gold mine
marcasite
mineralization
ore body
pyrite
sedimentary rock
sphalerite
texture
tonalite
Argentina
Precordillera
San Juan [Argentina]
description Gualcamayo mining district (68°38'26"W, 29°43'10" S) is located in the Central Precordillera, in the northeast of San Juan province. This sector is characterized by carbonate and sedimentary rocks of Ordovician-Permian age. This sequence is intruded by Miocene dacites and tonalites rocks. The district includes three deposits: Quebrada del Diablo Main, Amelia Ines-Magdalena and Quebrada del Diablo Lower West. Quebrada del Diablo Main is a Carlin-type deposit which is mined as an open pit. Amelia Inés-Magdalena is an iron, molybdenum, copper, zinc, lead and gold deposit, associated to magnesian skarns. Quebrada del Diablo Lower West is a blind ore body located between 500 and 600 metres deep. In Quebrada del Diablo Lower West, the gold mineralization is hosted by breccias with an wide variation in composition and relative abundance of clasts, matrix and cement, as well as the size of the clasts. The textural analysis of the mineralized breccias from Quebrada del Diablo Lower West suggests a tectonic origin. The mineral assemblage of pyrite, sphalerite and gold indicates low-sulphidation conditions and neutral to alkaline pH. The overprinted marcasite suggests a decrease in the concentration of sulfur in the mineralizing fluids. Later calcite veins with realgar, orpiment and gold indicate an increasing arsenic activity in the hydrothermal system.
format JOUR
author D'Annunzio, M.C.
Rubinstein, N.
author_facet D'Annunzio, M.C.
Rubinstein, N.
author_sort D'Annunzio, M.C.
title Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
title_short Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
title_full Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
title_fullStr Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
title_full_unstemmed Origin and mineralization stages of the breccias from Quebrada del Diablo Lower West, Gualcamayo mining district, San Juan Province
title_sort origin and mineralization stages of the breccias from quebrada del diablo lower west, gualcamayo mining district, san juan province
url http://hdl.handle.net/20.500.12110/paper_00044822_v70_n4_p542_DAnnunzio
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