GRANITIC EVOLUTION IN TIANSHAN, CHINA
Li Peiji, Li Songling and Zhang Zhide ( The 1st Regional Gecologcal Reconnaissance Brigade, Bureau of Geology and Mineral Resources of Xinjiang )
In the Tianshan region, a high peak of magmatism was in Hercynian period . Its products was called "Tianshan granite" , which can be distin-gushed into the metasomatic, type and the anatexis type. They have a mig rational law from southern to northern in time, and from the upwarping region to the down warping in space. Granitic evolution of Tianshan was plagio granite→biotite granite→ada-mellite→potash feldspar granite in lithology, and was intermediate→acidite→alkaline in chemical composition. The kinds of frace element are from few to many, and their existic from dispersion to concentration and from simple to complication . The accessory mineral association from simple to complication , minerals containing metallic and volatile component increase gradually . The redioactive intensity of rocks stranthen . The types of mineralize were successively irod→iron , coppkr and polymetal→copper and iron→copper and polymetal from the east to the west of region. The mineralize time from the east to the west and from the middle to the south or the north was getting late. The ore forming temperature was from high to low, etc .