Fluid inclusion studies of the Felbertal scheelite deposit

Abstract

Fluid inclusion measurements on quartz, scheelite, beryl, fluorite and calcite in the metamorphosed Felbertal scheelite deposit display two main types of fluid inclusions: 1. H2O-CO2 fluid inclusions are characterized by variable amounts of CO2 up to 18 wt.%. They show two or three phases at room temperature. The bulk homogenization temperatures for the inclusions range between +269 °C and +357 °C. The calculated salinities are between 2.2 and 7.8 wt.% NaCl equivalent. For the late CO2-bearing fluid inclusions a methane component is evident from microthermometrical data (Tmclath >10.0 °C combined with TmCO2<−56.6 °C) and from Raman microprobe analyses. 2. Aqueous, two-phase fluid inclusions with salinities in the range between 0 and 11 wt.% NaCl equivalent. Their homogenization temperatures are scattered between 100 °C and 360 °C.