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
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.
|Uncontrolled Keywords:||Sierras Pampeanas, Argentina, Neoproterozoic, Rodinia, SHRIMP data, Anorthosites|
|Subjects:||Sciences > Geology > Geochemistry|
|Deposited On:||03 Feb 2011 13:09|
|Last Modified:||03 Feb 2011 13:09|
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