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Revista de la Asociación Geológica Argentina
Print version ISSN 0004-4822On-line version ISSN 1851-8249
Abstract
CROSTA, Sabrina; VATTUONE, María E. and LATORRE, Carlos O.. Age, petrography and geochemistry of Cerro Falkner's granitoid. Rev. Asoc. Geol. Argent. [online]. 2008, vol.63, n.1, pp.152-155. ISSN 0004-4822.
Cerro Falkner is composed of granitic rocks underlying volcanic rocks of the Ventana Formation of Paleogene age. Those intrusives are granodioritic in composition, metaluminous to peraluminous, subalkaline, with characteristics of volcanic arc granites that are concordant with other granitoids of the Cordillera Patagónica Septentrional's northern segment. The age obtained by the K-Ar method on tschemakitic amphiboles (125 ± 20 Ma) points out a minimun age from the lower Cretaceous for the Cerro Falkner's granodiorite. Therefore the use of the term Los Machis Formation (Upper Cretaceous) would be incorrect for these rocks. This age, allows us to relate the granitic rocks on the study area to the lower Cretaceous, coeval with the volcanism of the Divisadero Group.
Keywords : Lower Cretaceous Granodiorites; Cerro Falkner; Neuquén.