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Geological Society, London, Special Publications; 1998; v. 142; p. 325-341;
DOI: 10.1144/GSL.SP.1998.142.01.16
© 1998 Geological Society of London

The granitoids of the Sierra de San Luis

E. J. Llambías1, A. M. Sato1, A. Ortiz Suárez2 & C. Prozzi3

1 Universidad Nacional de La Plata, Centro de Investigaciones Geológicas, Calle 1 No. 644, 1900 La Plata, Argentina
2 Universidad Nacional de San Luis, Departamento de Geología, Chacabuco y Pedernera, 5700 San Luis, Argentina
3 Universidad Nacional del Sur, Departamento de Geología, San Juan 670, 8000 Bahía Blanca, Argentina

The Sierra de San Luis consists of Lower Palaeozoic igneous and metamorphic rocks. The granitoids were emplaced between Late Cambrian and Early Carboniferous times, and the most important metamorphic and deformational events occurred during this period. Older metamorphic events have also been recognized but they are poorly constrained. The most important group of granitoids are as follows: (1) Deformed tonalites and granites. The tonalites have a calc-alkaline signature with low La/Yb ratio. They are the Early Famatinian, pre-orogenic, granitoids of Late Cambrian to Early Ordovician age and form part of a magmatic arc. (2) The La Escalerilla granite is a deformed biotite monzogranite and consists of a single elongated pluton; its relation with the other granitoids is not clear. (3) Garnet-biotite-muscovite granodiorites and granites and pegmatites. The granitoids have S-type signatures, with high 87Sr/86Sr and La/Yb ratios. They are possible crustal magmas related to a thickened crust and are interpreted as early- to syn-orogenic. (4) Biotite- and biotite-hornblende granites and minor tonalites of Devonian to Early Carboniferous age. The granites form large, post-orogenic, plutons and batholiths related to crustal uplift, and represent the last igneous activity of the Famatinian cycle (and also of the Palaeozoic era) in the Sierra de San Luis.





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