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MINERAL CHEMISTRY OF BIOTITE FROM GRANITES ASSOCIATED WITH DIFFERENT MINERALIZATION IN THREE STAGES OF YANSHANINA PERIOD IN THE SOUTHERN-MIDDLE PARTS OF THE DA HINGGAN LING MOUNTAINS AND ITS PETROGENETIC AND METALLOGENIC SIGNIFICANCE

LU Zhi-cheng 1, 2, DUAN Guo-zheng 2, DONG Guang-hua 2(1. Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences ,Guiyang 550002,China; 2. Changchun University of Science and Technology, Changchun 130026,China)  
Based on the mineralogical composition OF biotite occurring in Yanshanian granites in the southern-middle parts of the Da Hinggan Ling Mountains, it is suggested that the biotites in the Yanshanian granites are mainly lepidomelance and Fe-rich biotite, and they belong to the lepidomelance-annite series. The major composition of biotite shows that its host rocks are alkalic and calc-alkaline series rocks, and the Yanshanian granites have characters of the Nanling granite series and Yangtze river granite series, manifesting the granites in the region are of the mantle-crust mixing type. The granites, which evolved in three different stages of the Yanshanian period, stemmed from the same magma source. Biotites from the granites associated with different mineralization in three stages of the Yanshanian period are different in composition. The biotite is characterized by high contents of Mg and low contents of Fe 2+, which is from granites associated with Cu mineralization in the early stage of the Early Yanshanian period. And the biotite enriched in Fe and depleted in Mg is from granites related to Sn-polymetal mineralization at the early stage of the Late Yanshanian period. The biotite from the late stage of the Early Yanshanian granites related to lead-zinc-silver mineralization is similar to the biotite from the early stage of the Early Yanshanian granites and to that from the early stage of the Late Yanshanian granites.
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