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Journal of the Geological Society; 2005; v. 162; issue.1; p. 9-12;
DOI: 10.1144/0016-764904-100
© 2005 Geological Society of London

Short Communication

Grenvillian massif-type anorthosites in the Sierras Pampeanas

C. Casquet1, R.J. Pankhurst2, C.W. Rapela3, C. Galindo1, J. Dahlquist4, E. Baldo5, J. Saavedra6, J.M. González Casado7 & C.M. Fanning8

1 1Departamento de Petrología y Geoquímica, Universidad Complutense, 28040 Madrid, Spain (e-mail: casquet@geo.ucm.es)
2 2British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
3 3Centro de Investigaciones Geológicas, Universidad Nacional de La Plata, Calle 1 No. 644, 1900 La Plata, Argentina
4 4CRILAR-CONICET, 5301 Anillaco, La Rioja, Argentina
5 5Departamento de Geología, Universidad Nacional de Córdoba, Av. Velez Sarsfield 1611, 5000 Córdoba, Argentina
6 6Consejo Superior de Investigaciones Científicas, Instituto de Agrobiología y Recursos Naturales, 37071 Salamanca, Spain
7 7Departamento Química Agrícola, Geología y Geoquímica, Universidad Autónoma, 28049, Madrid, Spain
8 8Research School of Earth Sciences, The Australian National University, Canberra, A.C.T., Australia

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.


Keywords: Sierras Pampeanas, Argentina, Neoproterozoic, Rodinia, SHRIMP data, anorthosites.