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 principales: Casquet, César, Pankhurst, Robert J., Rapela, Carlos Washington, Galindo, Carmen, Dahlquist, Juan A., Baldo, Edgardo G., Saavedra, Julio, González Casado, J.M., Fanning, Christopher
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Geología
Sierras Pampeanas
Argentina
Neoproterozoic
Rodinia
SHRIMP data
Anorthosites
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128391
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
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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