Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)

The Sierras Australes fold and thrust belt (Buenos Aires Province, Argentina) was in the southwestern Gondwanaland margin during the Paleozoic. The Tunas Formation (Permian) is exposed along the eastern part of it and continues eastward beneath the Claromecó Basin. Anisotropy of magnetic susceptibil...

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Autores principales:	Arzadún, G., Tomezzoli, R.N., Cesaretti, N.N.
Formato:	JOUR
Materias:	anisotropy of magnetic susceptibility layer parallel shortening migration of the orogenic front Sierras Australes shortening direction southwest Gondwana boundary Anisotropy Geochronology Magnetic anisotropy Magnetic susceptibility Magnetism Plates (structural components) Tectonics Anisotropy of magnetic susceptibility Layer parallel shortenings Migration of the orogenic front Southwest Gondwana boundary Compaction compaction fold and thrust belt Gondwana magnetic susceptibility paleomagnetism Paleozoic plate motion sedimentation Argentina Scombridae
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_02787407_v35_n4_p1015_Arzadun
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_02787407_v35_n4_p1015_Arzadun
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spelling	todo:paper_02787407_v35_n4_p1015_Arzadun2023-10-03T15:17:07Z Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina) Arzadún, G. Tomezzoli, R.N. Cesaretti, N.N. anisotropy of magnetic susceptibility layer parallel shortening migration of the orogenic front Sierras Australes shortening direction southwest Gondwana boundary Anisotropy Geochronology Magnetic anisotropy Magnetic susceptibility Magnetism Plates (structural components) Tectonics Anisotropy of magnetic susceptibility Layer parallel shortenings Migration of the orogenic front Sierras Australes shortening direction Southwest Gondwana boundary Compaction compaction fold and thrust belt Gondwana magnetic susceptibility paleomagnetism Paleozoic plate motion sedimentation Argentina Scombridae The Sierras Australes fold and thrust belt (Buenos Aires Province, Argentina) was in the southwestern Gondwanaland margin during the Paleozoic. The Tunas Formation (Permian) is exposed along the eastern part of it and continues eastward beneath the Claromecó Basin. Anisotropy of magnetic susceptibility (AMS) and compaction studies are described and compared with previous paleomagnetic studies with the aim of determining direction and magnitude of the main stresses acting during the sedimentation of the Tunas Formation. The anisotropy ellipsoids are triaxial with oblate or prolate shapes, reflecting different stages of layer parallel shortening during the evolution of the basin. Kmax axes trend NW-SE, parallel to the fold axes, while Kmin move from a horizontal (base) to a vertical orientation at the top of the succession, showing a change from a tectonic to almost a sedimentary fabric. The magnitude of anisotropy and compaction degree decreases toward the top of the succession. The AMS results are consistent with the outcrop structural observations and the compaction and paleomagnetic data. Regional pattern indicates a compression from the SW along this part of Gondwana, with a migration of the orogenic front and attenuation toward the NE in the foreland basin during the Upper Paleozoic. This deformation, locally assigned to the San Rafael noncollisional orogenic phase, is the result of the latitudinal movements toward the Equator of Gondwana (southern plates) and Laurentia (northern plates) during the Permian. This movement is the result of a rearrangement of the microplates that collided with Gondwana during the Late Devonian, to configure Pangea during the Triassic. ©2016. American Geophysical Union. All Rights Reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02787407_v35_n4_p1015_Arzadun
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	anisotropy of magnetic susceptibility layer parallel shortening migration of the orogenic front Sierras Australes shortening direction southwest Gondwana boundary Anisotropy Geochronology Magnetic anisotropy Magnetic susceptibility Magnetism Plates (structural components) Tectonics Anisotropy of magnetic susceptibility Layer parallel shortenings Migration of the orogenic front Sierras Australes shortening direction Southwest Gondwana boundary Compaction compaction fold and thrust belt Gondwana magnetic susceptibility paleomagnetism Paleozoic plate motion sedimentation Argentina Scombridae
spellingShingle	anisotropy of magnetic susceptibility layer parallel shortening migration of the orogenic front Sierras Australes shortening direction southwest Gondwana boundary Anisotropy Geochronology Magnetic anisotropy Magnetic susceptibility Magnetism Plates (structural components) Tectonics Anisotropy of magnetic susceptibility Layer parallel shortenings Migration of the orogenic front Sierras Australes shortening direction Southwest Gondwana boundary Compaction compaction fold and thrust belt Gondwana magnetic susceptibility paleomagnetism Paleozoic plate motion sedimentation Argentina Scombridae Arzadún, G. Tomezzoli, R.N. Cesaretti, N.N. Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
topic_facet	anisotropy of magnetic susceptibility layer parallel shortening migration of the orogenic front Sierras Australes shortening direction southwest Gondwana boundary Anisotropy Geochronology Magnetic anisotropy Magnetic susceptibility Magnetism Plates (structural components) Tectonics Anisotropy of magnetic susceptibility Layer parallel shortenings Migration of the orogenic front Sierras Australes shortening direction Southwest Gondwana boundary Compaction compaction fold and thrust belt Gondwana magnetic susceptibility paleomagnetism Paleozoic plate motion sedimentation Argentina Scombridae
description	The Sierras Australes fold and thrust belt (Buenos Aires Province, Argentina) was in the southwestern Gondwanaland margin during the Paleozoic. The Tunas Formation (Permian) is exposed along the eastern part of it and continues eastward beneath the Claromecó Basin. Anisotropy of magnetic susceptibility (AMS) and compaction studies are described and compared with previous paleomagnetic studies with the aim of determining direction and magnitude of the main stresses acting during the sedimentation of the Tunas Formation. The anisotropy ellipsoids are triaxial with oblate or prolate shapes, reflecting different stages of layer parallel shortening during the evolution of the basin. Kmax axes trend NW-SE, parallel to the fold axes, while Kmin move from a horizontal (base) to a vertical orientation at the top of the succession, showing a change from a tectonic to almost a sedimentary fabric. The magnitude of anisotropy and compaction degree decreases toward the top of the succession. The AMS results are consistent with the outcrop structural observations and the compaction and paleomagnetic data. Regional pattern indicates a compression from the SW along this part of Gondwana, with a migration of the orogenic front and attenuation toward the NE in the foreland basin during the Upper Paleozoic. This deformation, locally assigned to the San Rafael noncollisional orogenic phase, is the result of the latitudinal movements toward the Equator of Gondwana (southern plates) and Laurentia (northern plates) during the Permian. This movement is the result of a rearrangement of the microplates that collided with Gondwana during the Late Devonian, to configure Pangea during the Triassic. ©2016. American Geophysical Union. All Rights Reserved.
format	JOUR
author	Arzadún, G. Tomezzoli, R.N. Cesaretti, N.N.
author_facet	Arzadún, G. Tomezzoli, R.N. Cesaretti, N.N.
author_sort	Arzadún, G.
title	Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
title_short	Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
title_full	Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
title_fullStr	Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
title_full_unstemmed	Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)
title_sort	tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the sierras australes thrust and fold belt (southwest gondwana boundary, argentina)
url	http://hdl.handle.net/20.500.12110/paper_02787407_v35_n4_p1015_Arzadun
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Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)

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