BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA, Vol. 54, n.. 1, 2001, p. 1-9 http://dx.doi.org/10.18268/BSGM2001v54n1a1

Eduardo González-Partida* y Luis F. Vassallo

Unidad de Investigación en Ciencias de la Tierra, Instituto de Geología, Universidad Nacional Autónoma de México, Campus UNAM - Juriquilla, A.P. 1-742, Querétaro, Qro. C.P. 76230

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Abstract

The post-orogenic magmatic intrusives localized in Tierra Caliente region, State of Mexico, at more or less 350 km of the Eocene-Miocene paleotrench, were emplaced in a continental crust with 35 km of thickness, characterized by black schist and Cretaceous volcanosedimentary rocks .

The individual typology of the stocks vary from adamelites to biotite granites. They belong to the mesocratic per-aluminous domain, aluminous association with a high aluminosity index and, considering alkalinity, they belong to the sodic subtype. These geochemical characteristics are very similar to those determined for the Tizapa series (black schist) which very probably acted as contaminants of the samples under consideration.

Keywords: Adamelites, paraluminous, mesocratic-sodic.