Based on rock-mineral identification and electron probing analysis of three types of granite systems in Xiangdong tungsten mining area of Hunan,it is verified that the feldspar in early Yanshanian granites is alkali feldspar,in albite An<5,and in most samples An<3.The anorthose in Indosinian granites has An=10~15,and it is oligoclase.Hence,the lithology of Denghuxian complex massif is coarse grained porphyritic biotite monzonitic granite,early Yanshanian medium grained porphyritic muscovite alkali-feldspar granite and fine grained alkali-feldspar granite.The systematic geochemical research on macro-elements and trace el-ements shows that early Yanshanian magmatism is characterized by silica-rich,meta-aluminic and calc-alka-line-rich which is apparently different from Indosinian granites.Early Yanshanian granite is alkali-feldspar granite,and it is consistent with alkali-feldspar granite related to vein type tungsten deposit in Nanling area. The mineralization is related to magmation of early Yanshanian granites.
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