Artículo

Lagabrielle, Y.; Suárez, M.; Malavieille, J.; Morata, D.; Espinoza, F.; Maury, R.C.; Scalabrino, B.; Barbero, L.; de la Cruz, R.; Rossello, E.; Bellon, H. "Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence" (2007) Terra Nova. 19(6):413-424
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Abstract:

Recent field work and review of radiometric data obtained from Neogene lavas and plutonic rocks exposed in the Eastern Central Patagonian Cordillera (46-48°S), which overlie subducted segments of the South Chile Ridge, suggest important Late Miocene to Pleistocene morphological changes in relation to base level variations and/or tectonic events. We present new field observations from a region south of Lago General Carrera-Buenos Aires, between the main Cordillera and the Meseta del Lago Buenos Aires, demonstrating that normal faulting controlled valley incisions and occurred during lava emplacement at 5-4 Ma and after 3 Ma. We also show that the 12 Ma basaltic flows of the Meseta del Lago Buenos Aires (∼2000 m a.s.l.) have been subjected to deep incision, with younger lavas dated at 1.2 Ma partially filling the valleys. These incisions are thought to reflect progressive eastward tilting of the entire meseta. Our new observations, together with additional features from Central Patagonia, strongly suggest that tectonic events led to a regional widespread morphological change after 5 Ma. The coincidence in time and space between the subduction of segments of the South Chile Ridge at 6 and 3 Ma causing opening of a slab window, and strong base level variations in the studied area, suggests a cause-and-effect relationship. In Central Patagonia, compressional tectonics ended well before extensional events reported here. Causes of uplift and further extension are probably completely disconnected. The uplift is purely tectonic in origin and occurred prior to the subduction of the South Chile Ridge. Extension should be a consequence of this subduction. © 2007 Blackwell Publishing Ltd.

Registro:

Documento: Artículo
Título:Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence
Autor:Lagabrielle, Y.; Suárez, M.; Malavieille, J.; Morata, D.; Espinoza, F.; Maury, R.C.; Scalabrino, B.; Barbero, L.; de la Cruz, R.; Rossello, E.; Bellon, H.
Filiación:CNRS-UMR 5234, Géosciences Montpellier, Place E. Bataillon CC 60, 34095 Montpellier Cedex 5, France
Servicio Nacional de Geología y Minería, Avenida Santa María 0104, Santiago, Chile
Departamento de Geología, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile
CNRS-UMR 6538 Domaines océaniques, UBO-IUEM, place Nicolas-Copernic, 29280 Plouzané, France
Departamento de Geología, Universidad de Cádiz, Cádiz, Spain
CONICET and Universidad de Buenos Aires, Departamento de Ciencias Geológicas, 1428 Buenos Aires, Argentina
Palabras clave:extensional tectonics; faulting; geochronology; Pliocene; radiometric method; subduction; uplift; Patagonia; South America
Año:2007
Volumen:19
Número:6
Página de inicio:413
Página de fin:424
DOI: http://dx.doi.org/10.1111/j.1365-3121.2007.00766.x
Título revista:Terra Nova
Título revista abreviado:Terra Nova
ISSN:09544879
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09544879_v19_n6_p413_Lagabrielle

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Citas:

---------- APA ----------
Lagabrielle, Y., Suárez, M., Malavieille, J., Morata, D., Espinoza, F., Maury, R.C., Scalabrino, B.,..., Bellon, H. (2007) . Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence. Terra Nova, 19(6), 413-424.
http://dx.doi.org/10.1111/j.1365-3121.2007.00766.x
---------- CHICAGO ----------
Lagabrielle, Y., Suárez, M., Malavieille, J., Morata, D., Espinoza, F., Maury, R.C., et al. "Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence" . Terra Nova 19, no. 6 (2007) : 413-424.
http://dx.doi.org/10.1111/j.1365-3121.2007.00766.x
---------- MLA ----------
Lagabrielle, Y., Suárez, M., Malavieille, J., Morata, D., Espinoza, F., Maury, R.C., et al. "Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence" . Terra Nova, vol. 19, no. 6, 2007, pp. 413-424.
http://dx.doi.org/10.1111/j.1365-3121.2007.00766.x
---------- VANCOUVER ----------
Lagabrielle, Y., Suárez, M., Malavieille, J., Morata, D., Espinoza, F., Maury, R.C., et al. Pliocene extensional tectonics in the Eastern Central Patagonian Cordillera: Geochronological constraints and new field evidence. Terra Nova. 2007;19(6):413-424.
http://dx.doi.org/10.1111/j.1365-3121.2007.00766.x