THE ORIGIN AND GEOLOGY OF THE TUWAISHAN GOLD DEPOSIT IN HAINAN PROVINCE

The Tuwaishan gold deposit occurs in felsic mylonite. The orebodies are controlled by the Gezhen brittle and ductile superimposed shear zone. The gold-carrying minerals are represented by fissure gold and interstitial gold.The oreforming substances of the deposit involve the components of rock formations in pre-geosynclinal, geosynclinal and geodepressional stages. Mineralization and mineralization stages show distinct reconstitution and superimposition, i.e., there occurred both the evolutional concentration of ore substances resulting from dynamometamorphic differentiation of rock formations in the pre-geosynclinal and geosynclinal stages and the superimpositional concentration of ore substances brought by multiple intrusions of granites of the geodepressional stage. Therefore, the Tuwaishan gold deposit is a polygenetic composite ore deposit formed by superimposition of magmatic hydrothermal mineralization and dynamometamorphic mineralization related to the long-continued evolution of the shear zone. The metallogenic epoch was mainly Late Indosinian and Yanshanian（Mesozoic）.