Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations

Along the central Andes of southern Bolivia, northern Chile and north-western Argentina Tertiary age clockwise vertical axis rotations have been palaeomagnetically determined. Various authors have proposed different mechanisms to explain this observation, but it still remains controversial as to whe...

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Autor principal: Prezzi, C.B.
Formato: JOUR
Materias:
paleomagnetism
polar wandering
Tertiary
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p407_Prezzi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v54_n4_p407_Prezzi2023-10-03T13:57:32Z Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations Prezzi, C.B. paleomagnetism polar wandering Tertiary Argentina Along the central Andes of southern Bolivia, northern Chile and north-western Argentina Tertiary age clockwise vertical axis rotations have been palaeomagnetically determined. Various authors have proposed different mechanisms to explain this observation, but it still remains controversial as to whether the rotations are local or regional and how they are related to the main phase of late Cenozoic shortening. In order to contribute to the understanding of the driving process or processes leading to the clockwise vertical axis rotations, 197 oriented cores were obtained from Cenozoic rocks (older than 6.45 ±0.15 Ma) cropping out in the Morro Blanco area (23° 00' S, 66° 30' W, Puna Jujena). Different palaeomagnetic demagnetization techniques were applied to the specimens. The fold test suggests the presence of both, a pre-tectonic rémanent magnetization and a post-tectonic one. These results indicate no evidence of vertical axis rotations in the studied area, at least since Late Miocene. The author considers that this fact could suggest that many of the palaeomagnetically detected rotations along the central Andes might be controlled by local structures. ©1999 Asociacián Gcológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p407_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 paleomagnetism
polar wandering
Tertiary
Argentina
spellingShingle paleomagnetism
polar wandering
Tertiary
Argentina
Prezzi, C.B.
Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
topic_facet paleomagnetism
polar wandering
Tertiary
Argentina
description Along the central Andes of southern Bolivia, northern Chile and north-western Argentina Tertiary age clockwise vertical axis rotations have been palaeomagnetically determined. Various authors have proposed different mechanisms to explain this observation, but it still remains controversial as to whether the rotations are local or regional and how they are related to the main phase of late Cenozoic shortening. In order to contribute to the understanding of the driving process or processes leading to the clockwise vertical axis rotations, 197 oriented cores were obtained from Cenozoic rocks (older than 6.45 ±0.15 Ma) cropping out in the Morro Blanco area (23° 00' S, 66° 30' W, Puna Jujena). Different palaeomagnetic demagnetization techniques were applied to the specimens. The fold test suggests the presence of both, a pre-tectonic rémanent magnetization and a post-tectonic one. These results indicate no evidence of vertical axis rotations in the studied area, at least since Late Miocene. The author considers that this fact could suggest that many of the palaeomagnetically detected rotations along the central Andes might be controlled by local structures. ©1999 Asociacián Gcológica Argentina.
format JOUR
author Prezzi, C.B.
author_facet Prezzi, C.B.
author_sort Prezzi, C.B.
title Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
title_short Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
title_full Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
title_fullStr Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
title_full_unstemmed Palaeomagnetism of Tertiary rocks of Puna jujena (23° S, 66° 30' W): No evidence of vertical axis rotations
title_sort palaeomagnetism of tertiary rocks of puna jujena (23° s, 66° 30' w): no evidence of vertical axis rotations
url http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p407_Prezzi
work_keys_str_mv AT prezzicb palaeomagnetismoftertiaryrocksofpunajujena23s6630wnoevidenceofverticalaxisrotations
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