Grenvillian massif-type anorthosites in the Sierras Pampeanas

We report the discovery of massif-type anorthosites in the Andean basement of the Western Sierras Pampeanas of Argentina. U–Pb zircon dating (by sensitive high-resolution ion microprobe) of a cogenetic gabbronorite dyke yields ages of 1070 ± 41 Ma for igneous emplacement and 431 ± 40 Ma for metamorp...

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Detalles Bibliográficos
Autores: Casquet, César, Pankhurst, Robert J., Rapela, Carlos Washington, Galindo, Carmen, Dahlquist, Juan A., Baldo, Edgardo G., Saavedra, Julio, González Casado, J.M., Fanning, Christopher
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2005
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/128391
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128391
Access Level:acceso abierto
Palabra clave:Geología
Sierras Pampeanas
Argentina
Neoproterozoic
Rodinia
SHRIMP data
Anorthosites
Descripción
Sumario:We report the discovery of massif-type anorthosites in the Andean basement of the Western Sierras Pampeanas of Argentina. U–Pb zircon dating (by sensitive high-resolution ion microprobe) of a cogenetic gabbronorite dyke yields ages of 1070 ± 41 Ma for igneous emplacement and 431 ± 40 Ma for metamorphism. These anorthosites are petrologically and geochemically comparable with those of the Grenville province of Laurentia. Palaeogeographical reconstructions of Rodinia at 1.0–1.1 Ga suggest that the Sierras Pampeanas anorthosites were part of a large anorthosite province in the late Mesoproterozoic.

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