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Grenvillian massif-type anorthosites in the Sierras Pampeanas

Casquet, César and Pankhurst, R.J. and Rapela, Carlos W. and Galindo Francisco, Mª del Carmen and Dahlquist, Juan A. and Baldo, Edgardo G. and Saavedra, Julio and González Casado, José Manuel and 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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Abstract

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.


Item Type:Article
Uncontrolled Keywords:Sierras Pampeanas, Argentina, Neoproterozoic, Rodinia, SHRIMP data, Anorthosites
Subjects:Sciences > Geology > Geochemistry
ID Code:12169
Deposited On:03 Feb 2011 13:09
Last Modified:03 Feb 2011 13:09

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