Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile

ABSTRACT Long-lived, high-angle fault systems constitute high-permeability zones that can localize the upward flow of hydrothermal fluids and magma throughout the upper crust. Intersections of these types of structures can develop complex interference patterns, which constitute volumes of damaged ro...

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Autores principales:	Piquer,José, Yáñez,Gonzalo, Rivera,Orlando, Cooke,David R.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2019
Materias:	Basement fault intersections Magma and hydrothermal fluid flow Central Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200223
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spelling	oai:scielo:S0718-710620190002002232019-08-02Long-lived crustal damage zones associated with fault intersections in the high Andes of Central ChilePiquer,JoséYáñez,GonzaloRivera,OrlandoCooke,David R. Basement fault intersections Magma and hydrothermal fluid flow Central Chile ABSTRACT Long-lived, high-angle fault systems constitute high-permeability zones that can localize the upward flow of hydrothermal fluids and magma throughout the upper crust. Intersections of these types of structures can develop complex interference patterns, which constitute volumes of damaged rock (networks of small-scale faults and fractures) where permeability may be significantly enhanced. This is relevant for understanding regional-scale structural controls on the emplacement of hydrothermal mineral deposits and volcanic centers, and also on the distribution of areas of active upper-crustal seismicity. In the high Andes of central Chile, regional-scale geophysical (magnetic, gravimetric, seismic) and structural datasets demonstrate that the architecture of this Andean segment is defined by NW- and NE-striking fault systems, oblique to the N-S trend of the magmatic arc. Fault systems with the same orientations are well developed in the basement of the Andes. The intersections of conjugate arc-oblique faults constitute the site of emplacement of Neogene intrusive complexes and giant porphyry Cu-Mo deposits, and define the location of major clusters of upper- crustal earthquakes and active volcanic centers, suggesting that these fault systems are still being reactivated under the current stress regime. A proper identification of one-dimensional, lithospheric-scale high-permeability zones located at the intersections of high-angle, arc-transverse fault systems could be the key to understanding problems such as the structural controls on magmatic and hydrothermal activity and the patterns of upper-crustal seismicity in the high Andes and similar orogenic belts.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.46 n.2 20192019-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200223en10.5027/andgeov46n2-3106
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Basement fault intersections Magma and hydrothermal fluid flow Central Chile
spellingShingle	Basement fault intersections Magma and hydrothermal fluid flow Central Chile Piquer,José Yáñez,Gonzalo Rivera,Orlando Cooke,David R. Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
description	ABSTRACT Long-lived, high-angle fault systems constitute high-permeability zones that can localize the upward flow of hydrothermal fluids and magma throughout the upper crust. Intersections of these types of structures can develop complex interference patterns, which constitute volumes of damaged rock (networks of small-scale faults and fractures) where permeability may be significantly enhanced. This is relevant for understanding regional-scale structural controls on the emplacement of hydrothermal mineral deposits and volcanic centers, and also on the distribution of areas of active upper-crustal seismicity. In the high Andes of central Chile, regional-scale geophysical (magnetic, gravimetric, seismic) and structural datasets demonstrate that the architecture of this Andean segment is defined by NW- and NE-striking fault systems, oblique to the N-S trend of the magmatic arc. Fault systems with the same orientations are well developed in the basement of the Andes. The intersections of conjugate arc-oblique faults constitute the site of emplacement of Neogene intrusive complexes and giant porphyry Cu-Mo deposits, and define the location of major clusters of upper- crustal earthquakes and active volcanic centers, suggesting that these fault systems are still being reactivated under the current stress regime. A proper identification of one-dimensional, lithospheric-scale high-permeability zones located at the intersections of high-angle, arc-transverse fault systems could be the key to understanding problems such as the structural controls on magmatic and hydrothermal activity and the patterns of upper-crustal seismicity in the high Andes and similar orogenic belts.
author	Piquer,José Yáñez,Gonzalo Rivera,Orlando Cooke,David R.
author_facet	Piquer,José Yáñez,Gonzalo Rivera,Orlando Cooke,David R.
author_sort	Piquer,José
title	Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
title_short	Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
title_full	Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
title_fullStr	Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
title_full_unstemmed	Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile
title_sort	long-lived crustal damage zones associated with fault intersections in the high andes of central chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062019000200223
work_keys_str_mv	AT piquerjose longlivedcrustaldamagezonesassociatedwithfaultintersectionsinthehighandesofcentralchile AT yanezgonzalo longlivedcrustaldamagezonesassociatedwithfaultintersectionsinthehighandesofcentralchile AT riveraorlando longlivedcrustaldamagezonesassociatedwithfaultintersectionsinthehighandesofcentralchile AT cookedavidr longlivedcrustaldamagezonesassociatedwithfaultintersectionsinthehighandesofcentralchile
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Long-lived crustal damage zones associated with fault intersections in the high Andes of Central Chile

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