东准噶尔贝勒库都克铝质A型花岗岩岩石化学特征

he research area is a tin metallogenic belt in Kalamaili region,East Junggar,Xinjiang, distribution has many types of granite, The Beilekuduke biotite granites there have long been thought to be of S-type. The preliminary research conducted by the authors shows that biotite granites are actually typical aluminous A-type granites characterized by high silicon (SiO2=76.67%～72.70%),low aluminium (Al2O3=11.91%～13.30%), depleted calcium and magnesium (CaO=0.39%～1.11%, MgO=0.02%～0.29%) and abundant alkali (the average Na2O+K2O=8.72%),the value of the FeOt/MgO is high (10.70～85.32),that different from I- and S-type.The biotite granite of these are not directly derived from depleted mantle, but are probably derived from the mantle and was buried young partial melting of crustal material and the crystallization of the product differentiation. Trace elements in granite tectonic discriminant diagram shows that they are a post-collisional granite, sign the Late Carboniferous Kalamaili district the end of orogenesis and plate tectonic evolution of the beginning.