Zhuokeng molybdenum deposit is a medium-sized porphyry deposit located in Zhe(zhejiang)-Min(Fujian)volcanic fault depression structural unit in Youxi county,Fujian Province.17 Mo ore bodies all occur in Late Jurassic porphyritic fine-grained monzonitic granite.In this paper material migration law in the ore-forming process is defined,and the element migration characteristics are shown by the stand-ardized Isocon diagram calculation method.During hydrothermal alteration Au,Ag,As,Na2O are moved out,SiO2,K2O,CaO,MgO,P2O5,Cu,Pb,Zn,Co,Sn,and Bi introduced indicating that the alteration is the main mechanism of Mo precipitation.Mo mineralization is closely related to silicification K-feldsparization.Based on the Mesozoic tectonic setting in South China Zhuokeng molybdenum deposit is considered a porphyritic molybdenum deposit formed under background of subduction of the Pacific plate under Eurasian plate.The ore fluid moves along primary cracks and structural cracks to shallow part to precipitate as ore.NE faults and their sub-faults are the structural mark,overprint of K-feldsparization and silicification developed in the porphyritic fine-grained monzoitic granite the alteration mark,and quartz veins and network fractures the rock vein marks for Mo exploration.
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