Grenvillian massif-type anorthosites in the Sierras Pampeanas
- 1 January 2005
- journal article
- Published by Geological Society of London in Journal of the Geological Society
- Vol. 162 (1), 9-12
- https://doi.org/10.1144/0016-764904-100
Abstract
We report the discovery of massif-type anorthosites\ud in the Andean basement of the Western\ud Sierras Pampeanas of Argentina. U–Pb zircon\ud dating (by sensitive high-resolution ion\ud microprobe) of a cogenetic gabbronorite dyke yields ages of\ud 1070 ± 41 Ma for igneous emplacement and 431 ± 40 Ma for\ud metamorphism. These anorthosites are petrologically and\ud geochemically comparable with those of the Grenville province\ud of Laurentia. Palaeogeographical reconstructions of\ud Rodinia at 1.0–1.1 Ga suggest that the Sierras Pampeanas\ud anorthosites were part of a large anorthosite province in the\ud late MesoproterozoicKeywords
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