GEOLOGICAL CHARACTERISTICS AND GENESIS OF THE TSUNKHEG TUNGSTEN DEPOSIT IN ALTAY AREA OF WESTERN MONGOLIA

The Tsunkheg tungsten deposit is located in the Altay W-Mo-Cu-Pb-Zn-Ag polymetallic metallogenic belt of western Mongolia. The wall rock of orebody is the volcanic sedimentary rock of Middle-Upper Ordovician Bakhriuk Formation and Early Devonian Taitaogushi complex, with the orebody occurred as vein, vein-like and lenticular forms. The wall rock alterations mainly include silicification, greisenization, fluoritization, albitization, chloritization and carbonatization, among which the former three are closely related to tungsten mineralization. The metallic minerals are mainly wolframite, scheelite, pyrrhotite, chalcopyrite, pyrite, molybdenite, bismuthinite and sphalerite, and the mineral assemblages have a certain zonation both horizontally and vertically. It is concluded from the preliminary analysis that the Tsunkheg tungsten deposit is of meso-hydrothermal quartz vein type, which is related to the intrusion of Hercynian acid-intermediate magma.