Albititas metasomáticas y venas de cuarzo en los leucogranitos de Burguillos del Cerro (España). Modelo de evolución hidrotermal basado en el estudio de inclusiones fluidas.
- N. Bachiller 1
- E. Quílez 2
- C. Casquet 3
- C. Galindo 3
- 1 Dpto. de Petrología y Geoquímica. Facultad de Geología. UCM. 28040 Madrid. Dpto.de Química Inorgánica y Materiales. Centro CC. Experimentales y Técnicas. Universidad San Pablo-CEU. 28668 Boadilla del Monte. Madrid.
- 2 Dpto.de Química Inorgánica y Materiales. Centro CC. Experimentales y Técnicas. Universidad San Pablo-CEU. 28668 Boadilla del Monte. Madrid.
- 3 Dpto. de Petrología y Geoquímica. Facultad de Geología. UCM. 28040 Madrid.
ISSN: 0213-683X
Année de publication: 1996
Número: 20
Pages: 1504-1506
Type: Article
D'autres publications dans: Geogaceta
Résumé
Slightly peraluminous to metaluminous leucogranites are common as dyke swarms in the Burguillos del Cerro Plutonic Compfex. They show superimposed hydrothermal alterations consisting of quartzrich albitites and Au-bearing quartz veins. Several types of fluid inclusions have been distinguished in the alteration. They belong to the system H2O-NaCI-KCI-MgCl2 -CaCl2 and range from high salinity to low salinity types. In any type, a trend of decreasing salinity concomitant to a decrease of mínimum P and T trapping conditions is found. An evolutive model is proposed consisting in the repetitive mixing of hot saline waters, initially of probable magmatic derivation, with a cold low salinity meteoric fluid, in several discrete episodes of hydrofracturing, under declining regional temperature conditions. Albitites and quartz veins seem to be temporally and genetically related.