The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes

In this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30° to 36°S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, r...

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Autores principales:	Arriagada,César, Ferrando,Rodolfo, Córdova,Loreto, Morata,Diego, Roperch,Pierrick
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2013
Materias:	Central Andes Maipo Orocline Bolivian Orocline Juan Fernández Ridge Paleomagnetism
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000300002
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spelling	oai:scielo:S0718-710620130003000022014-03-03The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean AndesArriagada,CésarFerrando,RodolfoCórdova,LoretoMorata,DiegoRoperch,Pierrick Central Andes Maipo Orocline Bolivian Orocline Juan Fernández Ridge Paleomagnetism In this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30° to 36°S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, results obtained in Late Jurassic to Neogeone rocks to the south, on the normal subduction segment, show sistematically clockwise rotations up to 40°. Paleomagnetic rotations are coeval with thrusting along the High Andes in Late Miocene times. We propose a coupled Bolivian Orocline-Juan Fernández Ridge (JFR) model where a far-field component of clockwise rotation related to the formation of the Bolivian Orocline was first acquired by the margin between 31° and 33°S. The same area was later rotated by a slight counterclockwise component related to the subduction of the JFR over the last 10 Ma. South of 33°S the clockwise rotations related to the Bolivian Orocline component were amplified by the subduction of the JFR.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.40 n.3 20132013-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000300002en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Central Andes Maipo Orocline Bolivian Orocline Juan Fernández Ridge Paleomagnetism
spellingShingle	Central Andes Maipo Orocline Bolivian Orocline Juan Fernández Ridge Paleomagnetism Arriagada,César Ferrando,Rodolfo Córdova,Loreto Morata,Diego Roperch,Pierrick The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
description	In this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30° to 36°S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, results obtained in Late Jurassic to Neogeone rocks to the south, on the normal subduction segment, show sistematically clockwise rotations up to 40°. Paleomagnetic rotations are coeval with thrusting along the High Andes in Late Miocene times. We propose a coupled Bolivian Orocline-Juan Fernández Ridge (JFR) model where a far-field component of clockwise rotation related to the formation of the Bolivian Orocline was first acquired by the margin between 31° and 33°S. The same area was later rotated by a slight counterclockwise component related to the subduction of the JFR over the last 10 Ma. South of 33°S the clockwise rotations related to the Bolivian Orocline component were amplified by the subduction of the JFR.
author	Arriagada,César Ferrando,Rodolfo Córdova,Loreto Morata,Diego Roperch,Pierrick
author_facet	Arriagada,César Ferrando,Rodolfo Córdova,Loreto Morata,Diego Roperch,Pierrick
author_sort	Arriagada,César
title	The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
title_short	The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
title_full	The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
title_fullStr	The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
title_full_unstemmed	The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes
title_sort	maipo orocline: a first scale structural feature in the miocene to recent geodynamic evolution in the central chilean andes
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000300002
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The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes

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