Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province

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A palaeomagnetic study was made on the Early Permian Del Salto Formation, exposed in the Western Precordillera (31.3°S, 69.2°W). Eleven sites were sampled for siltstone and fine-grained sandstone in the middle-upper part of the succession exposed in the creek at kilometre 114, San Juan. Standard dem...

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Autores principales: Rapalini, A.E., Mena, M.
Formato: Artículo publishedVersion
Publicado: 2001
Materias:
Andes
Palaeomagnetism
Precordillera
Rotation
Tectonics
Upper Palaeozoic
paleomagnetism
Paleozoic
tectonic rotation
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v56_n4_p494_Rapalini
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v56_n4_p494_Rapalini_oai
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Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_00044822_v56_n4_p494_Rapalini_oai
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spelling I28-R145-paper_00044822_v56_n4_p494_Rapalini_oai2024-08-16 Rapalini, A.E. Mena, M. 2001 A palaeomagnetic study was made on the Early Permian Del Salto Formation, exposed in the Western Precordillera (31.3°S, 69.2°W). Eleven sites were sampled for siltstone and fine-grained sandstone in the middle-upper part of the succession exposed in the creek at kilometre 114, San Juan. Standard demagnetization techniques permitted the identification of a characteristic remanence that showed good within-site consistency of direction at eight sites. Application of a tectonic correction showed that the characteristic remanence is pre-tectonic. A palaeomagnetic pole for the Del Salto Formation was computed, SC: 26.8°S, 357.0°E.δp = 4.4°, δm = 6.4°, N = 8. The position of SC indicates that the sampling locality underwent a counterclockwise rotation of about 40° around a vertical axis. The age of the rotation cannot be determined from the available data but it is most likely to have happened in either Permian or Late Cenozoic times. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mena, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v56_n4_p494_Rapalini info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2001;56(4):494-502 Andes Palaeomagnetism Precordillera Rotation Tectonics Upper Palaeozoic paleomagnetism Paleozoic tectonic rotation Argentina Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v56_n4_p494_Rapalini_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Andes
Palaeomagnetism
Precordillera
Rotation
Tectonics
Upper Palaeozoic
paleomagnetism
Paleozoic
tectonic rotation
Argentina
spellingShingle Andes
Palaeomagnetism
Precordillera
Rotation
Tectonics
Upper Palaeozoic
paleomagnetism
Paleozoic
tectonic rotation
Argentina
Rapalini, A.E.
Mena, M.
Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
topic_facet Andes
Palaeomagnetism
Precordillera
Rotation
Tectonics
Upper Palaeozoic
paleomagnetism
Paleozoic
tectonic rotation
Argentina
description A palaeomagnetic study was made on the Early Permian Del Salto Formation, exposed in the Western Precordillera (31.3°S, 69.2°W). Eleven sites were sampled for siltstone and fine-grained sandstone in the middle-upper part of the succession exposed in the creek at kilometre 114, San Juan. Standard demagnetization techniques permitted the identification of a characteristic remanence that showed good within-site consistency of direction at eight sites. Application of a tectonic correction showed that the characteristic remanence is pre-tectonic. A palaeomagnetic pole for the Del Salto Formation was computed, SC: 26.8°S, 357.0°E.δp = 4.4°, δm = 6.4°, N = 8. The position of SC indicates that the sampling locality underwent a counterclockwise rotation of about 40° around a vertical axis. The age of the rotation cannot be determined from the available data but it is most likely to have happened in either Permian or Late Cenozoic times.
format Artículo
Artículo
publishedVersion
author Rapalini, A.E.
Mena, M.
author_facet Rapalini, A.E.
Mena, M.
author_sort Rapalini, A.E.
title Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
title_short Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
title_full Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
title_fullStr Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
title_full_unstemmed Counterclockwise tectonic rotation of the Del Salto Formation (Lower Permian), San Juan Province
title_sort counterclockwise tectonic rotation of the del salto formation (lower permian), san juan province
publishDate 2001
url http://hdl.handle.net/20.500.12110/paper_00044822_v56_n4_p494_Rapalini
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v56_n4_p494_Rapalini_oai
work_keys_str_mv AT rapaliniae counterclockwisetectonicrotationofthedelsaltoformationlowerpermiansanjuanprovince
AT menam counterclockwisetectonicrotationofthedelsaltoformationlowerpermiansanjuanprovince
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