GEOLOGICAL CHARACTERISTICS OF THE GOLDCOPPER DEPOSITS IN WESTERN TIANSHAN

Western Tianshan,standing for the north branch of the western section of Tianshan Mountains in China,belongs to Tarim plate,induding Sailim massif,Boluokenu Early Paleozoic island arc belt and Yili Late Paleozoic rift.The area is one of the most significant Au-Cu mineralization unit within Paleozoic orogenic belt in China.The geochemical and geoph ysical fields indicate a well Au-Cu mineralizing background.The Au-Cu deposits were formed mainly in Hercynian,tectonic-magmatic geothermal events,as epithermal type and ductile shear zone type of gold deposits,and submarine volcanic exhalation-hydrothermal sedimentary type,skarn type,porphyry type and continental volcanic hydrothermal filling type of copper deposits.Five mineralizing belts are delineated,which are Sailim Cu-Au mineralizing belt,Tulasu-Yelimodun Au mineralizing belt,Chabuchar Cu-Au mineralizing belt,Awulale Cu mineralizing belt and Shenglidaban Au mineralizing belt.Main deposits are Axi gold deposit,Wangfeng gold deposit,Lamasu copper deposit and Yuxukaiputai copper deposit.