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Título: | Geochemistry of a Triassic dyke swarm in the North Patagonian Massif, Argentina. Implications for a postorogenic event of the Permian Gondwanide orogeny |
Autor(es): | González, Santiago Nicolás Greco, Gerson Alan González, Pablo Diego Sato, Ana Maria Llambias, Eduardo Jorge Varela, Ricardo |
Fecha de publicación: | 2016 |
Editorial: | Elsevier Science Ltd |
Citación: | González, Santiago Nicolás., Greco, Gerson Alan., González, Pablo Diego., Sato, Ana Maria., Llambias, Eduardo Jorge y Varela, Ricardo (2016). Geochemistry of a Triassic dyke swarm in the North Patagonian Massif, Argentina. Implications for a postorogenic event of the Permian Gondwanide orogeny. Elsevier Science Ltd; Journal of South American Earth Sciences; 70; 69-82 |
Revista: | Journal of South American Earth Sciences |
Abstract: | Permo-Triassic magmatism is widespread in the eastern North Patagonian Massif and has been related to the Gondwanide orogeny. Although a magmatic arc setting is widely accepted for the Permian plutonic rocks, the origin and geotectonic setting for the Triassic plutonic and volcanic rocks are still unknown. A NW-SE Triassic dyke swarm composed of andesites and latites with minor rhyolites was previously described in the Sierra Grande - Rincon de Paileman area. The dyke swarm was associated with extensional tectonics which was linked to a postorogenic process. In this paper we present new geochemical data of the rocks that form the swarm. Trachyandesites and rhyolites were separated based on their geochemical characteristics. Both groups may be considered originated from different sources. On the other hand, the content of incompatible elements (LILE and HFSE) indicates a strong relation between the swarm and an active continental margin. The samples also show a transitional signature between continental-arc and postcollisional or anorogenic settings. The new geochemical data on the dyke swarm support the idea of a magmatism that was linked to a postorogenic extensional tectonic regime related to a continental magmatic arc. Such an extension started in the Paleopacific margin of Pangea during the Anisian and might indicate the beginning of the Pangea break-up. |
Resumen: | - |
URI: | https://www.sciencedirect.com/science/article/pii/S0895981116300517?via%3Dihub http://rid.unrn.edu.ar/handle/20.500.12049/5615 |
Identificador DOI: | https://doi.org/10.1016/j.jsames.2016.04.009 |
ISSN: | 0895-9811 |
Aparece en las colecciones: | Artículos |
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Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899
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