Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

Stmcturalandmicrostmctaralobseirationscombmedwithapatiteandzirconfission4rackthermochronology within two sectors of the Main Andean Range in the Los Lagos Region of Chile reveal an episodic history of intrusion and deformation in the North Patagonian Batholith (NPB). A dextral displacement of ~30 km...

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Autores principales:	Adriasola,Alberto C, Stockhert,Bernhard
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2008
Materias:	Chile Liquiñe-Ofqui Fault Zone North Patagonian Batholith Fission-track dating Deformation Exhumation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100002
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spelling	oai:scielo:S0716-020820080001000022008-04-10Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)Adriasola,Alberto CStockhert,Bernhard Chile Liquiñe-Ofqui Fault Zone North Patagonian Batholith Fission-track dating Deformation Exhumation Stmcturalandmicrostmctaralobseirationscombmedwithapatiteandzirconfission4rackthermochronology within two sectors of the Main Andean Range in the Los Lagos Region of Chile reveal an episodic history of intrusion and deformation in the North Patagonian Batholith (NPB). A dextral displacement of ~30 km along the Liquifle-Ofqui fault zone (LOFZ) is inferred from the correlation of corresponding Cretaceous intrusions of the NPB across the fault zone at Reloncavi. Relative uplift of the western block in the late Miocene is indicated by apatite and zircon fission-track cooling histories. Microstructures in samples from Miocene and Cretaceous plutons along the fault zone generally indicate deformation at temperatures below ~300°C, with the exception of some samples from Cretaceous intrusions showing deformation at higher temperatures. In the Hornopirén area, significant relative uplift of the eastern block is indicated by 1. the different styles of deformation observed across the fault zone, 2. kinematic analysis of a shear zone in tonalite and 3. geobarometry of contact metamorphic mineral assemblages. For the plutonic rocks in the Hornopirén area, extremely rapid cooling is indicated by thermochronometry, suggesting the activity of hydrothermal systems or thermal effects of late shallow intrusionsinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.35 n.1 20082008-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100002en10.4067/S0716-02082008000100002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chile Liquiñe-Ofqui Fault Zone North Patagonian Batholith Fission-track dating Deformation Exhumation
spellingShingle	Chile Liquiñe-Ofqui Fault Zone North Patagonian Batholith Fission-track dating Deformation Exhumation Adriasola,Alberto C Stockhert,Bernhard Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
description	Stmcturalandmicrostmctaralobseirationscombmedwithapatiteandzirconfission4rackthermochronology within two sectors of the Main Andean Range in the Los Lagos Region of Chile reveal an episodic history of intrusion and deformation in the North Patagonian Batholith (NPB). A dextral displacement of ~30 km along the Liquifle-Ofqui fault zone (LOFZ) is inferred from the correlation of corresponding Cretaceous intrusions of the NPB across the fault zone at Reloncavi. Relative uplift of the western block in the late Miocene is indicated by apatite and zircon fission-track cooling histories. Microstructures in samples from Miocene and Cretaceous plutons along the fault zone generally indicate deformation at temperatures below ~300°C, with the exception of some samples from Cretaceous intrusions showing deformation at higher temperatures. In the Hornopirén area, significant relative uplift of the eastern block is indicated by 1. the different styles of deformation observed across the fault zone, 2. kinematic analysis of a shear zone in tonalite and 3. geobarometry of contact metamorphic mineral assemblages. For the plutonic rocks in the Hornopirén area, extremely rapid cooling is indicated by thermochronometry, suggesting the activity of hydrothermal systems or thermal effects of late shallow intrusions
author	Adriasola,Alberto C Stockhert,Bernhard
author_facet	Adriasola,Alberto C Stockhert,Bernhard
author_sort	Adriasola,Alberto C
title	Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
title_short	Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
title_full	Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
title_fullStr	Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
title_full_unstemmed	Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)
title_sort	cooling histories and deformation of plutonic rocks along the liquiñe-ofqui fault zone, southern chile (41°-42°15's)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082008000100002
work_keys_str_mv	AT adriasolaalbertoc coolinghistoriesanddeformationofplutonicrocksalongtheliquineofquifaultzonesouthernchile414215s AT stockhertbernhard coolinghistoriesanddeformationofplutonicrocksalongtheliquineofquifaultzonesouthernchile414215s
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Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)

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