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 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).
Registro:
Documento: |
Artículo
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Título: | Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline |
Autor: | Rapalini, A.E.; Peroni, J.; Luppo, T.; Tassone, A.; Cerredo, M.E.; Esteban, F.; Lippai, H.; Franciscovilas, J. |
Filiación: | Instituto de Geociencias Básicas Aplicadas y Ambientales de Buenos Aires (IGEBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Conicet, Argentina Área Geofísica, Dirección de Recursos Geológico-Mineros, Servicio Geológico y Minero Argentino (SEGEMAR), Buenos Aires, Argentina
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Palabras clave: | cordillera; igneous intrusion; Jurassic-Cretaceous boundary; magma; Mesozoic; metabasalt; metagabbro; paleomagnetism; Andes; Patagonia |
Año: | 2016
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Volumen: | 425
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Número: | 1
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Página de inicio: | 65
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Página de fin: | 80
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DOI: |
http://dx.doi.org/10.1144/SP425.3 |
Título revista: | Geological Society Special Publication
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Título revista abreviado: | Geol. Soc. Spec. Publ.
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ISSN: | 03058719
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v425_n1_p65_Rapalini |
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Citas:
---------- APA ----------
Rapalini, A.E., Peroni, J., Luppo, T., Tassone, A., Cerredo, M.E., Esteban, F., Lippai, H.,..., Franciscovilas, J.
(2016)
. Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline. Geological Society Special Publication, 425(1), 65-80.
http://dx.doi.org/10.1144/SP425.3---------- CHICAGO ----------
Rapalini, A.E., Peroni, J., Luppo, T., Tassone, A., Cerredo, M.E., Esteban, F., et al.
"Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline"
. Geological Society Special Publication 425, no. 1
(2016) : 65-80.
http://dx.doi.org/10.1144/SP425.3---------- MLA ----------
Rapalini, A.E., Peroni, J., Luppo, T., Tassone, A., Cerredo, M.E., Esteban, F., et al.
"Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline"
. Geological Society Special Publication, vol. 425, no. 1, 2016, pp. 65-80.
http://dx.doi.org/10.1144/SP425.3---------- VANCOUVER ----------
Rapalini, A.E., Peroni, J., Luppo, T., Tassone, A., Cerredo, M.E., Esteban, F., et al. Palaeomagnetism of Mesozoic magmatic bodies of the Fuegian Cordillera: Implications for the formation of the Patagonian Orocline. Geol. Soc. Spec. Publ. 2016;425(1):65-80.
http://dx.doi.org/10.1144/SP425.3