Rare earth element geochemistry and fluid characteristics of scheelite in the Hutti gold deposit, Hutti-Maski schist belt, Raichur district, Karnataka, India

Scheelite occurs as thin smears, isolated grains and veinlets in auriferous quartz reefs and sulfidized and auriferous biotite-chlorite schist in the Hutti deposit. Major host rocks at Hutti are mafic and sill-like felsic volcanic rocks and quartz reefs located at the shear contact of these rocks. Laser-Raman and fluid inclusion studies on scheelite show that H2O + CH4 ± CO2 + NaCl fluids, similar to gold mineralizing fluid are responsible for...