Biblioteca de la Universidad Complutense de Madrid

Grenvillian massif-type anorthosites in the Sierras Pampeanas

Impacto



Casquet, César y Pankhurst, R.J. y Rapela, Carlos W. y Galindo Francisco, Mª del Carmen y Dahlquist, Juan A. y Baldo, Edgardo G. y Saavedra, Julio y González Casado, José Manuel y Fanning, C.M. (2004) Grenvillian massif-type anorthosites in the Sierras Pampeanas. Journal of the Geological Society, 162 . pp. 9-12. ISSN 0016-7649

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Resumen

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.


Tipo de documento:Artículo
Palabras clave:Sierras Pampeanas, Argentina, Neoproterozoic, Rodinia, SHRIMP data, Anorthosites
Materias:Ciencias > Geología > Geoquímica
Código ID:12169
Depositado:03 Feb 2011 13:09
Última Modificación:03 Feb 2011 13:09

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