Porphyry Cu-Mo-Au mineralization related to adakite and Himalayan type granite in the northern margin of West Qinling
西秦岭北缘与埃达克岩和喜马拉雅型花岗岩有关的斑岩型铜-钼-金成矿作用

Adakite is one of intermediate and acidic magamatite related to mineralization, and it has been taken the special attention and interest during the latest 20 years; Himalayan granite is a term which is introduced recently to describe a kind of granite related to crust thickening. The study results in this essay show that in the northern edge of West Qinling exist Indosinian adakite and Himalayan type granite which are related with mineralization of gold, copper and molybdenum. The adakite and Himalayan type granite in Ayishan and Dewulu-Heihe area are characterized by the high value of Mg#,which may be caused by the mixing of mantle magma and crustal magma in the bottom of thickening crust, but the low value of Mg#,which adakite and Himalayan granite in Wenquan and Chijiazhaung area have, should be caused by partial melting of thickened low crust. In this paper, the geological setting of porphyry Cu-Mo-Au ore-belt in the northern section of West Qinling is introduced, the characteristics of adakite and type granite, and the relation with mineralization are analyzed. The study work reveal that orogenic zone of west Qinling formed in Triassic Period should be a favorable area for finding Cu-Mo-Au deposit due to the thick crust and frequently magmatic activities.