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...

Descripción completa

Detalles Bibliográficos
Autores: Casquet Martín, César, Pankhurst, R.J., Rapela, Carlos W., Galindo Francisco, María Del Carmen, Dahlquist, Juan A., Baldo, Edgardo G., Saavedra, Julio, González Casado, José Manuel, Fanning, C.M.
Tipo de recurso: artículo
Fecha de publicación:2004
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/49546
Acceso en línea:https://hdl.handle.net/20.500.14352/49546
Access Level:acceso abierto
Palabra clave:550.4(82)
Sierras Pampeanas
Argentina
Neoproterozoic
Rodinia
SHRIMP data
Anorthosites
Geoquímica
2503 Geoquímica
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.

Similares en LA Referencia