New evidence for an allochthonous plate in central southwestern Argentina?

Preliminary paleomagnetic data for rocks from the Choiyoi Formation, exposed at the Cerro Chachil and Sierra de Catan-Lil (39.1°S, 70.5°W, Cordillera Principal, Argentina), assigned sensu lato to the Permo-Triassic, are discussed. The directions of the stable remanent magnetization (SRM) for these r...

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Detalles Bibliográficos
Publicado: 1988
Materias:
allochthonous plate
Choiyoi Formation
fold test
palaeomagnetic data
stable remanent magnetization
Argentina, Cerro Chachil
Argentina, Sierra de Catan-Lil
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v1_n2_p163_Rapalini
http://hdl.handle.net/20.500.12110/paper_08959811_v1_n2_p163_Rapalini
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v1_n2_p163_Rapalini
record_format dspace
spelling paper:paper_08959811_v1_n2_p163_Rapalini2023-06-08T15:48:17Z New evidence for an allochthonous plate in central southwestern Argentina? allochthonous plate Choiyoi Formation fold test palaeomagnetic data stable remanent magnetization Argentina, Cerro Chachil Argentina, Sierra de Catan-Lil Preliminary paleomagnetic data for rocks from the Choiyoi Formation, exposed at the Cerro Chachil and Sierra de Catan-Lil (39.1°S, 70.5°W, Cordillera Principal, Argentina), assigned sensu lato to the Permo-Triassic, are discussed. The directions of the stable remanent magnetization (SRM) for these rocks have been submitted to the fold test. This analysis indicates that most of the Choiyoi Formation rocks are carriers of a prefolding SRM. The mean prefolding SRM for samples of normal and reversed polarity (within 40° of the mean; 277°, +54°, A95 = 8°, N = 21, K = 15.2, R = 19.683) yields a mean pole at 18°S, 126°W, 95 = 10°. The paleomagnetic data indicate two preliminary interpretations. One interpretation suggests that the sampling site rotated 90° clockwise around a vertical axis since Permian times. The other interpretation suggests that the sampling site integrates the allochthonous microplate suggested by Vilas and Valencio (1982) and Valencio and Vilas (1985). This microplate was situated in the Pacific at tropical latitudes in the late Paleozoic. © 1988. 1988 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v1_n2_p163_Rapalini http://hdl.handle.net/20.500.12110/paper_08959811_v1_n2_p163_Rapalini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic allochthonous plate
Choiyoi Formation
fold test
palaeomagnetic data
stable remanent magnetization
Argentina, Cerro Chachil
Argentina, Sierra de Catan-Lil
spellingShingle allochthonous plate
Choiyoi Formation
fold test
palaeomagnetic data
stable remanent magnetization
Argentina, Cerro Chachil
Argentina, Sierra de Catan-Lil
New evidence for an allochthonous plate in central southwestern Argentina?
topic_facet allochthonous plate
Choiyoi Formation
fold test
palaeomagnetic data
stable remanent magnetization
Argentina, Cerro Chachil
Argentina, Sierra de Catan-Lil
description Preliminary paleomagnetic data for rocks from the Choiyoi Formation, exposed at the Cerro Chachil and Sierra de Catan-Lil (39.1°S, 70.5°W, Cordillera Principal, Argentina), assigned sensu lato to the Permo-Triassic, are discussed. The directions of the stable remanent magnetization (SRM) for these rocks have been submitted to the fold test. This analysis indicates that most of the Choiyoi Formation rocks are carriers of a prefolding SRM. The mean prefolding SRM for samples of normal and reversed polarity (within 40° of the mean; 277°, +54°, A95 = 8°, N = 21, K = 15.2, R = 19.683) yields a mean pole at 18°S, 126°W, 95 = 10°. The paleomagnetic data indicate two preliminary interpretations. One interpretation suggests that the sampling site rotated 90° clockwise around a vertical axis since Permian times. The other interpretation suggests that the sampling site integrates the allochthonous microplate suggested by Vilas and Valencio (1982) and Valencio and Vilas (1985). This microplate was situated in the Pacific at tropical latitudes in the late Paleozoic. © 1988.
title New evidence for an allochthonous plate in central southwestern Argentina?
title_short New evidence for an allochthonous plate in central southwestern Argentina?
title_full New evidence for an allochthonous plate in central southwestern Argentina?
title_fullStr New evidence for an allochthonous plate in central southwestern Argentina?
title_full_unstemmed New evidence for an allochthonous plate in central southwestern Argentina?
title_sort new evidence for an allochthonous plate in central southwestern argentina?
publishDate 1988
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v1_n2_p163_Rapalini
http://hdl.handle.net/20.500.12110/paper_08959811_v1_n2_p163_Rapalini
_version_ 1768542845512187904

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