Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)

The current paper analyzes the evolution of the Abanico Basin, in the Chilean Principal Cordillera in central Chile (33°-35°S). According to previous studies, the basin has been affected by two main deformational episodes: the first, related to extension, and the second, to partial basin inversion....

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Autores principales:	Muñoz-Sáez,Carolina, Pinto,Luisa, Charrier,Reynaldo, Nalpas,Thierry
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Andes Abanico Basin Tectonic inversion Shortcut thrusts Aconcagua fold-thrust belt
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100001
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spelling	oai:scielo:S0718-710620140001000012014-03-24Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)Muñoz-Sáez,CarolinaPinto,LuisaCharrier,ReynaldoNalpas,Thierry Andes Abanico Basin Tectonic inversion Shortcut thrusts Aconcagua fold-thrust belt The current paper analyzes the evolution of the Abanico Basin, in the Chilean Principal Cordillera in central Chile (33°-35°S). According to previous studies, the basin has been affected by two main deformational episodes: the first, related to extension, and the second, to partial basin inversion. Deposits of the Abanico Formation, Eocene-Oligocene, and the Farellones Formation, Early-Middle Miocene, represent these two deformational episodes, respectively. Studies of the basin deposits and the structural features show that the basin was asymmetric and that it developed two main depocenters. The eastern depocenter is deeper and was controlled by a west-dipping fault system (El Diablo Fault System) that formed its eastern border. We propose that the geometry of the basin and the magnitude of inversion were strongly influenced by the load generated by the thick volcanic and volcaniclastic pile that accumulated in the eastern depocenter. Through analogue modeling, we interpret that the Aconcagua fold-thrust belt was triggered at ~16 Ma by a shortcut thrust rooted in the El Diablo Fault System, which during inversion was blocked because of the high load exerted by the deposits of the Abanico and Farellones formations. In addition, the stratified Mesozoic succession that formed the eastern border of the basin allowed the propagation of the shortcut thrust along the ductile Oxfordian gypsum layer. This would have determined the east vergence of the fold-thrust belt. On the western side of the basin, the absence of weak layers prevented development of a west-vergent fold-thrust belt.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100001en10.5027/andgeoV41n1-a01
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Andes Abanico Basin Tectonic inversion Shortcut thrusts Aconcagua fold-thrust belt
spellingShingle	Andes Abanico Basin Tectonic inversion Shortcut thrusts Aconcagua fold-thrust belt Muñoz-Sáez,Carolina Pinto,Luisa Charrier,Reynaldo Nalpas,Thierry Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
description	The current paper analyzes the evolution of the Abanico Basin, in the Chilean Principal Cordillera in central Chile (33°-35°S). According to previous studies, the basin has been affected by two main deformational episodes: the first, related to extension, and the second, to partial basin inversion. Deposits of the Abanico Formation, Eocene-Oligocene, and the Farellones Formation, Early-Middle Miocene, represent these two deformational episodes, respectively. Studies of the basin deposits and the structural features show that the basin was asymmetric and that it developed two main depocenters. The eastern depocenter is deeper and was controlled by a west-dipping fault system (El Diablo Fault System) that formed its eastern border. We propose that the geometry of the basin and the magnitude of inversion were strongly influenced by the load generated by the thick volcanic and volcaniclastic pile that accumulated in the eastern depocenter. Through analogue modeling, we interpret that the Aconcagua fold-thrust belt was triggered at ~16 Ma by a shortcut thrust rooted in the El Diablo Fault System, which during inversion was blocked because of the high load exerted by the deposits of the Abanico and Farellones formations. In addition, the stratified Mesozoic succession that formed the eastern border of the basin allowed the propagation of the shortcut thrust along the ductile Oxfordian gypsum layer. This would have determined the east vergence of the fold-thrust belt. On the western side of the basin, the absence of weak layers prevented development of a west-vergent fold-thrust belt.
author	Muñoz-Sáez,Carolina Pinto,Luisa Charrier,Reynaldo Nalpas,Thierry
author_facet	Muñoz-Sáez,Carolina Pinto,Luisa Charrier,Reynaldo Nalpas,Thierry
author_sort	Muñoz-Sáez,Carolina
title	Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
title_short	Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
title_full	Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
title_fullStr	Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
title_full_unstemmed	Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)
title_sort	influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: the eocene-oligocene abanico basin case, central chile andes (33°-35°s)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100001
work_keys_str_mv	AT munozsaezcarolina influenceofdepositionalloadonthedevelopmentofashortcutfaultsystemduringtheinversionofanextensionalbasintheeoceneoligoceneabanicobasincasecentralchileandes3335s AT pintoluisa influenceofdepositionalloadonthedevelopmentofashortcutfaultsystemduringtheinversionofanextensionalbasintheeoceneoligoceneabanicobasincasecentralchileandes3335s AT charrierreynaldo influenceofdepositionalloadonthedevelopmentofashortcutfaultsystemduringtheinversionofanextensionalbasintheeoceneoligoceneabanicobasincasecentralchileandes3335s AT nalpasthierry influenceofdepositionalloadonthedevelopmentofashortcutfaultsystemduringtheinversionofanextensionalbasintheeoceneoligoceneabanicobasincasecentralchileandes3335s
_version_	1714205843022413824

Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S)

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