La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético

The Tunas Formation of Sierras Australes, Buenos Aires Province. Palaeomagnetic evidence for relations between sedimentation and deformation. The Sierras Australes is a curved orogenic fold and thrust belt with a northwest-southeast strike, exposed in the south western part of Buenos Aires province...

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Guardado en:
Detalles Bibliográficos
Publicado: 1999
Materias:
deformation
paleomagnetism
Permian
sedimentation
tectonics
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n3_p220_Tomezzoli
http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_p220_Tomezzoli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v54_n3_p220_Tomezzoli
record_format dspace
spelling paper:paper_00044822_v54_n3_p220_Tomezzoli2023-06-08T14:25:22Z La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético deformation paleomagnetism Permian sedimentation tectonics Argentina The Tunas Formation of Sierras Australes, Buenos Aires Province. Palaeomagnetic evidence for relations between sedimentation and deformation. The Sierras Australes is a curved orogenic fold and thrust belt with a northwest-southeast strike, exposed in the south western part of Buenos Aires province (Argentina). Implications of recent palaeomagnetic results on these rocks are analysed. The Tunas Formation is of broad area extent and is the youngest unit of the Carboniferous-Permian Pillahuincó Group. The palaeoflora and palaeofauna indicate a Permian age for these rocks. Recent palaeomagnetic data indicate that the Tunas Formation acquired its magnetization during as well as before folding. Whereas syntectonic magnetizations are confined to the area of the Sierra de las Tunas (northeast), pretectonic magnetizations were found in the Sierra de Pillahuincó (southeast). The syntectonic poles have been grouped into a mean Tunas palaeomagnetic pole. This pole corresponds to the Early Permian section of the South America APWP, and indicates that a fold of the Sierras Australes occurred until those times, very soon after or practically contemporaneously with deposition of the Tunas sequence. The Early Permian deformation may represent the activity of the San Rafaelic orogenic phase in the region. Pretectonic magnetization isolated in the Sierra de Pillahuincó, yielded the Pillahuincó palaeomagnetic pole. This pole corresponds to the late Early Permian section of the South American APWP. These younger and different magnetizations indicate the migration of the orogenic front towards the east-northeast, with a gradual attenuation of the deformation through time. © 1999 Asociación Geológica Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n3_p220_Tomezzoli http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_p220_Tomezzoli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic deformation
paleomagnetism
Permian
sedimentation
tectonics
Argentina
spellingShingle deformation
paleomagnetism
Permian
sedimentation
tectonics
Argentina
La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
topic_facet deformation
paleomagnetism
Permian
sedimentation
tectonics
Argentina
description The Tunas Formation of Sierras Australes, Buenos Aires Province. Palaeomagnetic evidence for relations between sedimentation and deformation. The Sierras Australes is a curved orogenic fold and thrust belt with a northwest-southeast strike, exposed in the south western part of Buenos Aires province (Argentina). Implications of recent palaeomagnetic results on these rocks are analysed. The Tunas Formation is of broad area extent and is the youngest unit of the Carboniferous-Permian Pillahuincó Group. The palaeoflora and palaeofauna indicate a Permian age for these rocks. Recent palaeomagnetic data indicate that the Tunas Formation acquired its magnetization during as well as before folding. Whereas syntectonic magnetizations are confined to the area of the Sierra de las Tunas (northeast), pretectonic magnetizations were found in the Sierra de Pillahuincó (southeast). The syntectonic poles have been grouped into a mean Tunas palaeomagnetic pole. This pole corresponds to the Early Permian section of the South America APWP, and indicates that a fold of the Sierras Australes occurred until those times, very soon after or practically contemporaneously with deposition of the Tunas sequence. The Early Permian deformation may represent the activity of the San Rafaelic orogenic phase in the region. Pretectonic magnetization isolated in the Sierra de Pillahuincó, yielded the Pillahuincó palaeomagnetic pole. This pole corresponds to the late Early Permian section of the South American APWP. These younger and different magnetizations indicate the migration of the orogenic front towards the east-northeast, with a gradual attenuation of the deformation through time. © 1999 Asociación Geológica Argentina.
title La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
title_short La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
title_full La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
title_fullStr La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
title_full_unstemmed La Formación Tunas en las Sierras Australes de la Provincia de Buenos Aires. Relaciones entre sedimentación y deformación a través de su estudio paleomagnético
title_sort la formación tunas en las sierras australes de la provincia de buenos aires. relaciones entre sedimentación y deformación a través de su estudio paleomagnético
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n3_p220_Tomezzoli
http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_p220_Tomezzoli
_version_ 1768541542073499648

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