Mineralogía y condiciones de cristalización en el complejo subvolcánico de Barcarrota (Badajoz, España)

C. Galindo; C. Casquet

doi:10.3989/egeol.87433-4585

Mineralogía y condiciones de cristalización en el complejo subvolcánico de Barcarrota (Badajoz, España)

Authors

C. Galindo Dpto. de Geología. Universidad de Extremadura
C. Casquet Dpto. de Petrología y Geoquímica. Universidad Complutense

DOI:

https://doi.org/10.3989/egeol.87433-4585

Keywords:

Mineral chemistry, geothermometry, physico-chemical conditions of crystallization

Abstract

A description of mineral chemistry from rocks of the subvolcanic Barcarrota Complex is made. This igneous massif consists of several sub-alkaline lithologies, namely olivine gabbros, diorites, quartz-monzonites and amphibole granites, as well as minor peralkaline granites. Physico-chemical conditions during magma crystallization are obtained on the basis of mineral data. Thus different geothermometers lead to the following crystallization temperatures: olivine gabbros (972-1.008° C), diorites (953-995° C), quartz-monzonites (801-833° C) and amphibole granites 750° C. The presence of illmenite as the sole Fe-Ti mineral in these rocks (except in the peralkaline types where it is magnetite), sugests that the fO2 was never higher than the MW buffer, decreasing continuously with the differentiation degree fram fO2= 1O^-13.2 atm. for the olivine gabbros to 10^-18.87 atm. in the granites) Furthemore water played an important role during crystallization of the different magmas.

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Published

1987-08-30

How to Cite

Galindo, C., & Casquet, C. (1987). Mineralogía y condiciones de cristalización en el complejo subvolcánico de Barcarrota (Badajoz, España). Estudios Geológicos, 43(3-4), 169–177. https://doi.org/10.3989/egeol.87433-4585

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Issue

Vol. 43 No. 3-4 (1987)

Section

Articles

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