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Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: implications for the formation of the Patagonian Orocline

By
Augusto E. Rapalini
Augusto E. Rapalini
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Javier Peroni
Javier Peroni
2
Área Geofísica, Dirección de Recursos Geológico-Mineros, Servicio Geológico y Minero Argentino (SEGEMAR), Buenos Aires, Argentina
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Tomás Luppo
Tomás Luppo
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Alejandro Tassone
Alejandro Tassone
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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María Elena Cerredo
María Elena Cerredo
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Federico Esteban
Federico Esteban
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Horacio Lippai
Horacio Lippai
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Juan Franciscovilas
Juan Franciscovilas
1
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet
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Published:
January 01, 2016

Abstract

It is not known whether the Patagonian Orocline, the major bend of the southern Andes at the southern tip of South America, is a primary or secondary feature. Palaeomagnetic data along the Patagonian Orocline are still too scarce to provide a reliable and unambiguous answer to this question. New palaeomagnetic results on Late Jurassic–Late Cretaceous magmatic units along the central segment of the Fuegian Cordillera are reported. Data from four Late Cretaceous small intrusions and three sites on Late Jurassic–Early Cretaceous metabasalts and metagabbros showed anticlockwise declination deviations between 21° and 46° with respect to South America. From these and previous data, a picture of a nearly homogeneous post-Late Cretaceous regional rotation of the central Fuegian Cordillera is suggested. This supports a model of nearly 30° of anticlockwise secondary bending of the Patagonian Orocline since the Late Cretaceous (72 Ma). Lack of rotation of post-50 Ma sedimentary rocks exposed to the north of our study region, and larger rotations (of c. 90°) reported to the south of it suggest that a geographical and/or temporal progression of rotation values from south to north in the Fuegian part of the Patagonian Orocline should be investigated.

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Contents

Geological Society, London, Special Publications

Palaeomagnetism in Fold and Thrust Belts: New Perspectives

E. L. Pueyo
E. L. Pueyo
IGME, Spain
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F. Cifelli
F. Cifelli
Università degli Studi Roma TRE, Italy
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A. J. Sussman
A. J. Sussman
Los Alamos National Laboratory, USA
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B. Oliva-Urcia
B. Oliva-Urcia
Universidad Autónoma de Madrid, Spain
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Geological Society of London
Volume
425
ISBN electronic:
9781862399570
Publication date:
January 01, 2016

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