On the Geological Characteristics and Genesis of Yangwuchang Tungsten (Gold) Deposit in the Yangxie-Fengbeihe Metallogenetic Belt, East Qinling

The Yangwuchang tungsten (gold) deposit is located in the eastern part of the Yangxie-Fengbeihe gold-tungsten metallogenetic belt, east Qinling. Through field survey, ore identification and comprehensive studies, this paper clarified the geological characteristics and ore-controlling factors of the deposit, discussed genesis of ore deposit, and preliminarily established the trinity prospecting prediction model, which provides a direction for further W-Au prospecting in Yangxie area. The results show that the ore bodies occur in the NE-NEE faults in the Shangdanfault zone, and are hosted in the Neoproterozoic Yangxie gneiss suite. The metal minerals are medium-high temperature mineral assemblages of pyrite, wolframite, scheelite, chalcopyrite, sphalerite, galena and tetrahedrite. Ore-forming process includes hydrothermal mineralization and supergene periods. The former can be divided into three metallogenic stages: quartz-fine-grained pyrite stage, quartz-wolframite-scheelite-polymetallic sulfide stage and quartz-calcite-sericite stage. Wall-rock alteration is mainly silicification, pyritization and muscovitization. The genesis of this deposit is considered to be a post-magmatic hydrothermal deposit, controlled by the Indosinian granite, faults and wall rock.