Affiliation:
1. BRGM, BP 6009, 45060 Orléans cedex 2
Abstract
AbstractA combined stable-isotope and microthermometric study was applied to wolframite-bearing and arsenopy-rite-bearing quartz-tourmaline veins, quartz-tourmaline veins associated with leucogranite, schist and the two types of granite – massive monzogranite and leucogranite stocks – of the tungsten Châtaigneraie district, in order to estimate pressure-temperature formation conditions of quartz-tourmaline veins and determine the origin of mineralizing fluids.Pressure-temperature conditions of barren-quartz-tourmaline-veins are estimated at 1.4 ± 0.4 kbars (around 5 km depth under lithostatic regime) and 487 ± 34°C. Oxygen and hydrogen isotopic compositions of mineralizing fluids indicate a dominant component of leucogranite-derived fluids in wolframite-bearing veins whereas arsenopyrite-bearing veins are strongly equilibrated with host schist.
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