Geología y petrología de los granitoides del sur de la Sierra de Comechingones, Córdoba, Argetina

F. E. Nullo; M. R. Fagiano; J. E. Otamendi

doi:10.3989/egeol.92485-6388

Geología y petrología de los granitoides del sur de la Sierra de Comechingones, Córdoba, Argetina

Authors

F. E. Nullo Departamento de Geología. Univ. Nac. Río Cuarto. Río Cuarto
M. R. Fagiano Departamento de Geología. Univ. Nac. Río Cuarto. Río Cuarto
J. E. Otamendi Consejo Nacional de Investigaciones Científicas y Técnicas.

DOI:

https://doi.org/10.3989/egeol.92485-6388

Keywords:

Peraluminous granitoids, Lower Paleozoic, Sierras Pampeanas, Argentina

Abstract

The petrography and petrology characteristics of a group of granitoid bodies from the crystalline basement of Southern Comechingones Hills, is described here.

In the metamorphic Complex biotitic gneisses, anphibolites, marbles and metabasic rocks were recognized. The main metamorphic episode in this area reached high-temperature within medium grade conditions.

These granitoid are: biotitic granites, leucogranites and gneissic granites.

The biotitic granites, with biotite, apatite sillimanite and garnet, are elongate bodies, concordant with the main penetrative schistosity. Have medium to small grain, with an important foliation, shown by the lineation of micaceous minerals.

The muscovite, garnet, tourmaline, dumortierite and biotite leucogranites have tabular shape, and an extension more than one kilometre.

The gneissic granites are plutons that intruded concordant to the regional structural trend. Biotite, sillimanite, monacite and apatite minerals are characteristic of these rocks. Radimetric ages obtained in nearby areas, show that granitoids may be of Lower Paleozoic age.

Geology and petrology characteristics of granitoids suggest that they may have been produced by partial melt of crustal metasedimentary rocks.

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Published

1992-12-30

How to Cite

Nullo, F. E., Fagiano, M. R., & Otamendi, J. E. (1992). Geología y petrología de los granitoides del sur de la Sierra de Comechingones, Córdoba, Argetina. Estudios Geológicos, 48(5-6), 221–227. https://doi.org/10.3989/egeol.92485-6388

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Issue

Vol. 48 No. 5-6 (1992)

Section

Articles

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