Zeolitas y minerales cálcicos de baja temperatura en las pegmatitas graníticas del plutón de La Cabrera (Sistema Central Español)

J. González del Tánago; A. La Iglesia

doi:10.3989/egeol.98545-6217

Zeolitas y minerales cálcicos de baja temperatura en las pegmatitas graníticas del plutón de La Cabrera (Sistema Central Español)

Authors

J. González del Tánago Departamento de Petrología y Geoquímica. Facultad de Ciencias Geológicas. Universidad Complutense. Madrid
A. La Iglesia Instituto de Geología Económica. CSIC. Departamento de Petrología y Geoquímica. Facultad de Ciencias Geológicas. Universidad Complutense. Madrid

DOI:

https://doi.org/10.3989/egeol.98545-6217

Keywords:

granitic pegmatites, hydrothermal granitic alteration, zeolites, babingtonite, bavenite, chabazite-(Ca), datolite, fluorapophyllite, heulandite-(Ca), laumontite, prehnite, stilbite-(Ca), La Cabrera, Spanish Central Massif

Abstract

A late hydrothermal activity in the La Cabrera granitic pluton developed in some miarolitic cavities and pegmatites several mineral associations according to the temperature decreasing. Among these associations, the calcic medium-low temperature have a special interest. They are unique in the Spanish Central System. The characteristic minerals, beside calcite, are prehnite, laumontite, heulandite-(Ca), stilbite-(Ca), chabazite( Ca), fluorapophyllite, datolite and bavenite. All minerals are characterised by X-ray diffraction and thermal analysis. Their chemical compositions are studied, including babingtonite, an accessory mineral in these associations.
The maximum hydrothermal activity occurred at 250 ± 50° C decreasing towards 140° C. During the cooling an increase of f_CO₂ produced calcite.

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Published

1998-12-30

How to Cite

González del Tánago, J., & La Iglesia, A. (1998). Zeolitas y minerales cálcicos de baja temperatura en las pegmatitas graníticas del plutón de La Cabrera (Sistema Central Español). Estudios Geológicos, 54(5-6), 181–190. https://doi.org/10.3989/egeol.98545-6217

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Issue

Vol. 54 No. 5-6 (1998)

Section

Articles

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