The sanrafaelic remagnetization of precordillera in the permian: New evidence

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A paleomagnetic study, carried out on 9 sites of the La Flecha Formation (facies Los Sapitos, Upper Cambrian, Marjuman-Steptoean) exposed along the la Angostura creek, Precordillera of La Rioja (29.5°S, 68.7°W), permitted to determine two magnetic components. One is postectonic and of low coerciviti...

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Autores principales:	Rapalini, A.E., Astini, R.A.
Formato:	Artículo publishedVersion
Lenguaje:	Inglés
Publicado:	2005
Materias:	Cambrian Carbonates Paleomagnetism Precordillera San rafael carbonate formation mechanism geographical distribution magnetite orogeny paleomagnetism Permian Permian-Triassic boundary remagnetization tectonic rotation Argentina La Rioja [Argentina] Mendoza San Rafael Massif South America Angostura
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p290_Rapalini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paperaa:paper_00044822_v60_n2_p290_Rapalini
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spelling	paperaa:paper_00044822_v60_n2_p290_Rapalini2023-06-12T16:40:07Z The sanrafaelic remagnetization of precordillera in the permian: New evidence Rev. Asoc. Geol. Argent. 2005;60(2):290-300 Rapalini, A.E. Astini, R.A. Cambrian Carbonates Paleomagnetism Precordillera San rafael Cambrian carbonate formation mechanism geographical distribution magnetite orogeny paleomagnetism Permian Permian-Triassic boundary remagnetization tectonic rotation Argentina La Rioja [Argentina] Mendoza Precordillera San Rafael Massif South America Angostura A paleomagnetic study, carried out on 9 sites of the La Flecha Formation (facies Los Sapitos, Upper Cambrian, Marjuman-Steptoean) exposed along the la Angostura creek, Precordillera of La Rioja (29.5°S, 68.7°W), permitted to determine two magnetic components. One is postectonic and of low coercivities and unblocking temperatures (A, Dec: 7.5°, Inc: -40.3°, a95: 10.1°, N: 6), being interpreted as a recent remanence of probable viscous origin. A second, pretectonic, component was isolated in seven sites with opposite polarities and is likely carried by magnetite (B, Dec: 206.9°, Inc: 63.3°, a95: 12.8°, N: 7). The paleomagnetic pole position for this component (Lat: 63.8°S, Long: 244.6°E, dp: 15.9°, dm: 20.2°) suggests that the remanence was acquired by the end of the Permian and it is interpreted as produced by the regional remagnetization associated with the San Rafael orogenic phase found in other units of the Precordillera. An analysis of pole positions, type of magnetizations, polarities and geographic distribution of the remagnetized units suggests a pattern of time-space migration of the remagnetization from west to east, between the Early Permian and the Permian-Triassic. This pattern is consistent with a model of remagnetization by migration of fluids expelled from the orogenic area that reached rocks not involved directly in the deformation. The pole position obtained for La Flecha Formation also suggests the lack of major tectonic rotations in the study area since the Permian. © 2005 Asociación Geológica Argentina. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p290_Rapalini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language	Inglés
orig_language_str_mv	eng
topic	Cambrian Carbonates Paleomagnetism Precordillera San rafael Cambrian carbonate formation mechanism geographical distribution magnetite orogeny paleomagnetism Permian Permian-Triassic boundary remagnetization tectonic rotation Argentina La Rioja [Argentina] Mendoza Precordillera San Rafael Massif South America Angostura
spellingShingle	Cambrian Carbonates Paleomagnetism Precordillera San rafael Cambrian carbonate formation mechanism geographical distribution magnetite orogeny paleomagnetism Permian Permian-Triassic boundary remagnetization tectonic rotation Argentina La Rioja [Argentina] Mendoza Precordillera San Rafael Massif South America Angostura Rapalini, A.E. Astini, R.A. The sanrafaelic remagnetization of precordillera in the permian: New evidence
topic_facet	Cambrian Carbonates Paleomagnetism Precordillera San rafael Cambrian carbonate formation mechanism geographical distribution magnetite orogeny paleomagnetism Permian Permian-Triassic boundary remagnetization tectonic rotation Argentina La Rioja [Argentina] Mendoza Precordillera San Rafael Massif South America Angostura
description	A paleomagnetic study, carried out on 9 sites of the La Flecha Formation (facies Los Sapitos, Upper Cambrian, Marjuman-Steptoean) exposed along the la Angostura creek, Precordillera of La Rioja (29.5°S, 68.7°W), permitted to determine two magnetic components. One is postectonic and of low coercivities and unblocking temperatures (A, Dec: 7.5°, Inc: -40.3°, a95: 10.1°, N: 6), being interpreted as a recent remanence of probable viscous origin. A second, pretectonic, component was isolated in seven sites with opposite polarities and is likely carried by magnetite (B, Dec: 206.9°, Inc: 63.3°, a95: 12.8°, N: 7). The paleomagnetic pole position for this component (Lat: 63.8°S, Long: 244.6°E, dp: 15.9°, dm: 20.2°) suggests that the remanence was acquired by the end of the Permian and it is interpreted as produced by the regional remagnetization associated with the San Rafael orogenic phase found in other units of the Precordillera. An analysis of pole positions, type of magnetizations, polarities and geographic distribution of the remagnetized units suggests a pattern of time-space migration of the remagnetization from west to east, between the Early Permian and the Permian-Triassic. This pattern is consistent with a model of remagnetization by migration of fluids expelled from the orogenic area that reached rocks not involved directly in the deformation. The pole position obtained for La Flecha Formation also suggests the lack of major tectonic rotations in the study area since the Permian. © 2005 Asociación Geológica Argentina.
format	Artículo Artículo publishedVersion
author	Rapalini, A.E. Astini, R.A.
author_facet	Rapalini, A.E. Astini, R.A.
author_sort	Rapalini, A.E.
title	The sanrafaelic remagnetization of precordillera in the permian: New evidence
title_short	The sanrafaelic remagnetization of precordillera in the permian: New evidence
title_full	The sanrafaelic remagnetization of precordillera in the permian: New evidence
title_fullStr	The sanrafaelic remagnetization of precordillera in the permian: New evidence
title_full_unstemmed	The sanrafaelic remagnetization of precordillera in the permian: New evidence
title_sort	sanrafaelic remagnetization of precordillera in the permian: new evidence
publishDate	2005
url	http://hdl.handle.net/20.500.12110/paper_00044822_v60_n2_p290_Rapalini
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The sanrafaelic remagnetization of precordillera in the permian: New evidence

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