The identification of the Guqiong orogenic Ag–Au polymetallic deposit in southern Tibet: Evidences from mineralogy, geochronology and fluid evolution

Guqiong is an Ag–Au polymetallic deposit located in the eastern part of the Au–Sb ore belt along the Indus-Yarlung Zangbo suture in the North Himalaya. In this study, we have identified three major alteration/mineralization stages for Guqiong based on the mineral assemblages and their paragenetic relationships, namely the (I) pre-ore alteration, forming mainly ore-barren thick quartz veins and vuggy quartz; (II) main ore stage that comprises...