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Keywords:

Geochemistry & Geophysics

Abstract:

Chlorite-quartz veins have been examined at the southern border of the Stavelot-Venn Massif. Pressure and temperature conditions during the formation of these veins can be deduced by a combined study of fluid inclusions and chlorite geothermometry. Total homogenization temperatures of the H2O-CO2-NaCl inclusions give temperature estimates of 300-415°C. Chlorite temperatures calculated from two empirical models and one thermodynamic model range from 380 to 435°C. From the intersection of the isochores (equal density lines) of the H2O-CO2-NaCl system with the independent geothermometers, pressures of 175-280 MPa can be obtained. These pressures are higher than the general metamorphic pressure range of 100-200 MPa in this region.