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

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 pal...

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Autores principales: Rapalini, A.E., Peroni, J., Luppo, T., Tassone, A., Cerredo, M.E., Esteban, F., Lippai, H., Franciscovilas, J.
Formato: SER
Materias:
cordillera
igneous intrusion
Jurassic-Cretaceous boundary
magma
Mesozoic
metabasalt
metagabbro
paleomagnetism
Andes
Patagonia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03058719_v425_n1_p65_Rapalini
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03058719_v425_n1_p65_Rapalini
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spelling todo:paper_03058719_v425_n1_p65_Rapalini2023-10-03T15:22:06Z Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline Rapalini, A.E. Peroni, J. Luppo, T. Tassone, A. Cerredo, M.E. Esteban, F. Lippai, H. Franciscovilas, J. cordillera igneous intrusion Jurassic-Cretaceous boundary magma Mesozoic metabasalt metagabbro paleomagnetism Andes Patagonia 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 218 and 468 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 308 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. 908) 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. © 2016 The Author(s). Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Peroni, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tassone, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerredo, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Esteban, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lippai, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03058719_v425_n1_p65_Rapalini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic cordillera
igneous intrusion
Jurassic-Cretaceous boundary
magma
Mesozoic
metabasalt
metagabbro
paleomagnetism
Andes
Patagonia
spellingShingle cordillera
igneous intrusion
Jurassic-Cretaceous boundary
magma
Mesozoic
metabasalt
metagabbro
paleomagnetism
Andes
Patagonia
Rapalini, A.E.
Peroni, J.
Luppo, T.
Tassone, A.
Cerredo, M.E.
Esteban, F.
Lippai, H.
Franciscovilas, J.
Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
topic_facet cordillera
igneous intrusion
Jurassic-Cretaceous boundary
magma
Mesozoic
metabasalt
metagabbro
paleomagnetism
Andes
Patagonia
description 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 218 and 468 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 308 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. 908) 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. © 2016 The Author(s).
format SER
author Rapalini, A.E.
Peroni, J.
Luppo, T.
Tassone, A.
Cerredo, M.E.
Esteban, F.
Lippai, H.
Franciscovilas, J.
author_facet Rapalini, A.E.
Peroni, J.
Luppo, T.
Tassone, A.
Cerredo, M.E.
Esteban, F.
Lippai, H.
Franciscovilas, J.
author_sort Rapalini, A.E.
title Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
title_short Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
title_full Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
title_fullStr Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
title_full_unstemmed Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline
title_sort palaeomagnetism of mesozoic magmatic bodies of the fuegian cordillera: implications for the formation of the patagonian orocline
url http://hdl.handle.net/20.500.12110/paper_03058719_v425_n1_p65_Rapalini
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