New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation

Along the Central Andes a pattern of vertical axis tectonic rotations has been paleomagnetically identified. The rotations are clockwise in southern Bolivia, northern Chile and northwestern Argentina. Various models have been proposed to explain the geodynamic evolution of the Central Andes, but the...

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Detalles Bibliográficos
Autores principales:	Prezzi, Claudia Beatriz, Somoza, Ruben
Publicado:	2004
Materias:	geodynamics Miocene paleomagnetism tectonic rotation thrust Andes Puna South America
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v38_n2_p93_Prezzi http://hdl.handle.net/20.500.12110/paper_02643707_v38_n2_p93_Prezzi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_02643707_v38_n2_p93_Prezzi
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spelling	paper:paper_02643707_v38_n2_p93_Prezzi2023-06-08T15:22:57Z New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation Prezzi, Claudia Beatriz Somoza, Ruben geodynamics Miocene paleomagnetism tectonic rotation thrust Andes Puna South America Along the Central Andes a pattern of vertical axis tectonic rotations has been paleomagnetically identified. The rotations are clockwise in southern Bolivia, northern Chile and northwestern Argentina. Various models have been proposed to explain the geodynamic evolution of the Central Andes, but the driving mechanism of these rotations remains controversial. Constraining the spatial variability and the timing of the rotations may contribute to a better understanding of their origin. Our results complement information from previous studies, improving the knowledge of tectonic rotations in the region of the northern Argentine Puna and western Cordillera Oriental. In the San Juan de Oro basin (SJOB), 132 cores were drilled from the middle Miocene Tiomayo Formation in the zone of Tiomayo-Santa Ana (22°30′S-66°30′W), and from the ∼17 Ma Casa Colorada dacite dome complex. Another 114 cores were collected from middle Miocene dacitic dome centers emplaced in the zone of Laguna de Pozuelos basin (22°30′S-66°00′W). The results of our paleomagnetic study suggest that the sampled zones underwent very low, statistically insignificant rotation since middle Miocene. However, a tendency for low magnitude rotation appears when observing our data together with paleomagnetic results from coeval rocks in neighbouring areas. If so, this low rotation could be related to middle Miocene thrust activity in the central and eastern parts of the Cordillera Oriental. The combined analysis of paleomagnetic and structural data illustrates the probable, direct relationship between timing of significant rotations and timing of local deformation in the sourthern Central Andes. © 2004 Elsevier Ltd. All rights reserved. Fil:Prezzi, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v38_n2_p93_Prezzi http://hdl.handle.net/20.500.12110/paper_02643707_v38_n2_p93_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	geodynamics Miocene paleomagnetism tectonic rotation thrust Andes Puna South America
spellingShingle	geodynamics Miocene paleomagnetism tectonic rotation thrust Andes Puna South America Prezzi, Claudia Beatriz Somoza, Ruben New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
topic_facet	geodynamics Miocene paleomagnetism tectonic rotation thrust Andes Puna South America
description	Along the Central Andes a pattern of vertical axis tectonic rotations has been paleomagnetically identified. The rotations are clockwise in southern Bolivia, northern Chile and northwestern Argentina. Various models have been proposed to explain the geodynamic evolution of the Central Andes, but the driving mechanism of these rotations remains controversial. Constraining the spatial variability and the timing of the rotations may contribute to a better understanding of their origin. Our results complement information from previous studies, improving the knowledge of tectonic rotations in the region of the northern Argentine Puna and western Cordillera Oriental. In the San Juan de Oro basin (SJOB), 132 cores were drilled from the middle Miocene Tiomayo Formation in the zone of Tiomayo-Santa Ana (22°30′S-66°30′W), and from the ∼17 Ma Casa Colorada dacite dome complex. Another 114 cores were collected from middle Miocene dacitic dome centers emplaced in the zone of Laguna de Pozuelos basin (22°30′S-66°00′W). The results of our paleomagnetic study suggest that the sampled zones underwent very low, statistically insignificant rotation since middle Miocene. However, a tendency for low magnitude rotation appears when observing our data together with paleomagnetic results from coeval rocks in neighbouring areas. If so, this low rotation could be related to middle Miocene thrust activity in the central and eastern parts of the Cordillera Oriental. The combined analysis of paleomagnetic and structural data illustrates the probable, direct relationship between timing of significant rotations and timing of local deformation in the sourthern Central Andes. © 2004 Elsevier Ltd. All rights reserved.
author	Prezzi, Claudia Beatriz Somoza, Ruben
author_facet	Prezzi, Claudia Beatriz Somoza, Ruben
author_sort	Prezzi, Claudia Beatriz
title	New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
title_short	New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
title_full	New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
title_fullStr	New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
title_full_unstemmed	New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation
title_sort	new paleomagnetic data from the northern puna and western cordillera oriental, argentina: a new insight on the timing of rotational deformation
publishDate	2004
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v38_n2_p93_Prezzi http://hdl.handle.net/20.500.12110/paper_02643707_v38_n2_p93_Prezzi
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New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: A new insight on the timing of rotational deformation

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