Abstract

DAHLQUIST, Juan A; ALASINO, Pablo H  and  MORALES CAMERA, Matías M. Petrografía, química mineral y geoquímica comparada de los Plutones Potrerillos y Cerro La gloria: magmatismo de arco y retroarco en el carbonífero inferior. Rev. Asoc. Geol. Argent. [online]. 2015, vol.72, n.2, pp.167-181. ISSN 0004-4822.

The Potrerillos and Cerro La Gloria plutons crop out in the south of the Sierra de Toro Negro (Western Sierras Pampeanas) and the western flank of the Sierra de Famatina. Studies of mineral chemistry (about 80 analyses) obtained from crystallized minerals in the Potrerillos pluton, on samples with whole-chemistry data presented in this paper, and their comparison with our own data reported for Cerro La Gloria pluton, indicate that biotite and amphibole crystallized in an arc and a retroarc environment, respectively. The whole-chemistry data are fully consistent with the mineral chemistry studies. Thus, although the Potrerillos pluton is located only 45 km to the west of Cerro La Gloria pluton and both were emplaced during the Early Carboniferous, their parent magmas were generated in two different geodynamic settings. This conclusion is an important contribution to understanding the evolution of pre-Andean margin of SW Gondwana during the Early Carboniferous.

Keywords : Calc-alkaline and A-type granites; Biotite chemical; Western Sierras Pampeanas; Sierra de Famatina.

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