High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)

ABSTRACT The Andean segment between 31 and 34°S documents a unique Tertiary tectono-magmatic evolution that involves the generation of three world-class Late Miocene porphyry copper deposits: Los Pelambres, Río Blanco-Los Bronces and El Teniente. The genesis of these giant ore-deposits occurred duri...

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Autores principales:	Garrido,Iván, Cembrano,José, Siña,Armando, Stedman,Peter, Yáñez,Gonzalo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2002
Materias:	Porphyry copper Bulk shortening Magmatic oxidation state
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100003
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spelling	oai:scielo:S0716-020820020001000032005-11-14High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)Garrido,IvánCembrano,JoséSiña,ArmandoStedman,PeterYáñez,Gonzalo Porphyry copper Bulk shortening Magmatic oxidation state ABSTRACT The Andean segment between 31 and 34°S documents a unique Tertiary tectono-magmatic evolution that involves the generation of three world-class Late Miocene porphyry copper deposits: Los Pelambres, Río Blanco-Los Bronces and El Teniente. The genesis of these giant ore-deposits occurred during a major copper mineralization cycle that took place progressively from north to south, in close association with the emplacement of a series of calc-alkaline, highly oxidized granitoids (Fe2O3/FeO = ratio between 1 and 3). These granitoids were emplaced coevally with bulk shortening and appear to have fractionated along active steep, margin-oblique fault zones that may have played a key role in the exsolution process of mineralized hydrothermal fluids. An increasing contamination of the mantle source by components from altered oceanic crust beneath the arc could account for a rise in the oxidation state of the magmas without producing a significant increase in the 87Sr/86Sr initial ratio, as suggested by new and previously published geochemical data. The authors propose that this increasing supply of oceanic crust components to the Miocene magmas could be linked to the progressive subduction of the Juan Fernández Ridge from north to southinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.29 n.1 20022002-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100003en10.4067/S0716-02082002000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Porphyry copper Bulk shortening Magmatic oxidation state
spellingShingle	Porphyry copper Bulk shortening Magmatic oxidation state Garrido,Iván Cembrano,José Siña,Armando Stedman,Peter Yáñez,Gonzalo High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
description	ABSTRACT The Andean segment between 31 and 34°S documents a unique Tertiary tectono-magmatic evolution that involves the generation of three world-class Late Miocene porphyry copper deposits: Los Pelambres, Río Blanco-Los Bronces and El Teniente. The genesis of these giant ore-deposits occurred during a major copper mineralization cycle that took place progressively from north to south, in close association with the emplacement of a series of calc-alkaline, highly oxidized granitoids (Fe2O3/FeO = ratio between 1 and 3). These granitoids were emplaced coevally with bulk shortening and appear to have fractionated along active steep, margin-oblique fault zones that may have played a key role in the exsolution process of mineralized hydrothermal fluids. An increasing contamination of the mantle source by components from altered oceanic crust beneath the arc could account for a rise in the oxidation state of the magmas without producing a significant increase in the 87Sr/86Sr initial ratio, as suggested by new and previously published geochemical data. The authors propose that this increasing supply of oceanic crust components to the Miocene magmas could be linked to the progressive subduction of the Juan Fernández Ridge from north to south
author	Garrido,Iván Cembrano,José Siña,Armando Stedman,Peter Yáñez,Gonzalo
author_facet	Garrido,Iván Cembrano,José Siña,Armando Stedman,Peter Yáñez,Gonzalo
author_sort	Garrido,Iván
title	High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
title_short	High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
title_full	High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
title_fullStr	High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
title_full_unstemmed	High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)
title_sort	high magma oxidation state and bulk crustal shortening: key factors in the genesis of andean porphyry copper deposits, central chile (31-34°s)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082002000100003
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High magma oxidation state and bulk crustal shortening: key factors in the genesis of Andean porphyry copper deposits, central Chile (31-34°S)

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