New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)

The Central Andes show a pronounced bend at 18°S. This bend is called the Arica elbow. The existence of counterclockwise vertical axis rotations north of the Arica elbow and clockwise rotations to the south has been determined from palaeomagnetic data. Various authors have proposed different mechani...

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Detalles Bibliográficos
Autores principales: Prezzi, C.B., Vilas, J.F.
Formato: JOUR
Materias:
palaeomagnetism
rotation
Andes
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00401951_v292_n1-2_p85_Prezzi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00401951_v292_n1-2_p85_Prezzi
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spelling todo:paper_00401951_v292_n1-2_p85_Prezzi2023-10-03T14:50:07Z New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna) Prezzi, C.B. Vilas, J.F. palaeomagnetism rotation Andes Argentina The Central Andes show a pronounced bend at 18°S. This bend is called the Arica elbow. The existence of counterclockwise vertical axis rotations north of the Arica elbow and clockwise rotations to the south has been determined from palaeomagnetic data. Various authors have proposed different mechanism to explain this, but whether rotations are local or regional and whether the Arica elbow is a primary or secondary feature of the Central Andes remains controversial. In order to contribute to the palaeomagnetic data available for the Argentine Puna, 102 oriented cores were obtained from Cenozoic rocks cropping out in the Bajo de las Siete Cruvas area of the southern Argentine Puna. Different demagnetization techniques were applied. Pretectonic remnent magnetizations were isolated, and indicate the existence of a clockwise vertical axis rotation of approximately 7°-18°. Taking into account the presence of a major thrust fault to the west of teh studied area, this rotation could be considered to be of local character, induced by a Miocene-Pliocene compression. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00401951_v292_n1-2_p85_Prezzi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic palaeomagnetism
rotation
Andes
Argentina
spellingShingle palaeomagnetism
rotation
Andes
Argentina
Prezzi, C.B.
Vilas, J.F.
New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
topic_facet palaeomagnetism
rotation
Andes
Argentina
description The Central Andes show a pronounced bend at 18°S. This bend is called the Arica elbow. The existence of counterclockwise vertical axis rotations north of the Arica elbow and clockwise rotations to the south has been determined from palaeomagnetic data. Various authors have proposed different mechanism to explain this, but whether rotations are local or regional and whether the Arica elbow is a primary or secondary feature of the Central Andes remains controversial. In order to contribute to the palaeomagnetic data available for the Argentine Puna, 102 oriented cores were obtained from Cenozoic rocks cropping out in the Bajo de las Siete Cruvas area of the southern Argentine Puna. Different demagnetization techniques were applied. Pretectonic remnent magnetizations were isolated, and indicate the existence of a clockwise vertical axis rotation of approximately 7°-18°. Taking into account the presence of a major thrust fault to the west of teh studied area, this rotation could be considered to be of local character, induced by a Miocene-Pliocene compression.
format JOUR
author Prezzi, C.B.
Vilas, J.F.
author_facet Prezzi, C.B.
Vilas, J.F.
author_sort Prezzi, C.B.
title New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
title_short New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
title_full New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
title_fullStr New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
title_full_unstemmed New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)
title_sort new evidence of clockwise vertical axis rotations south of the arica elbow (argentine puna)
url http://hdl.handle.net/20.500.12110/paper_00401951_v292_n1-2_p85_Prezzi
work_keys_str_mv AT prezzicb newevidenceofclockwiseverticalaxisrotationssouthofthearicaelbowargentinepuna
AT vilasjf newevidenceofclockwiseverticalaxisrotationssouthofthearicaelbowargentinepuna
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