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- W2522224236 abstract "Two principal types of sulphide occurrences have been recognized in the Taxco-Guanajuato province : 1 ) Exhalative-like massive sulphide deposits enclosed in the metamorphic Tizapa sequence and, 2) Quartz veins with sulphide concentrations spatially related with intrusive monzogranite stocks. The characteristics of the hydrothermal solutions genetically responsible for the mineralizations are determined using fluid inclusion studies. 3 different types of solutions are identified : — Hypersaline brines (bulk salinity up to 67 wt %) close to halite saturation at elevated temperature (⋍ 500 °C) with boiling point around 420 °C ; they are related with the volcanism associated with the massive sulphide occurrences, — Essentially complex carbonic solutions related with the epizonal metamorphism of the Tizapa sequence, — Aqueous solutions associated with ore veins with salinity decreasing with homogenization temperature from 10 to 1 eq. wt % NaCl and 350 to 150 °C ; K/Na at. ratio is high, near 0.3. There is no evidence for boiling. Geothermal gradient is estimated around 80 °C/km. All these characteristics are close to those encountered in other deposits of the same type. The genetic model postulated from sulfur isotope data supports a selective remobilization of the massive or disseminated sulphides initially trapped in the Tizapa sequence by circulation of meteoric water in relation with the granitic intrusions." @default.
- W2522224236 created "2016-09-30" @default.
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- W2522224236 date "1984-01-01" @default.
- W2522224236 modified "2023-10-17" @default.
- W2522224236 title "Analyse des phases fluides associées à la genèse des amas sulfurés et des filons Au-Ag de la province de Taxco-Guanajuato (Mexique)" @default.
- W2522224236 doi "https://doi.org/10.3406/bulmi.1984.7759" @default.
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