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A STUDY OF PETROLOGY AND METALLOGENETIC EPOCH OF GOLD IN JIANCHALING DEPOSIT,SHAANXI PROVINCE

Huang Wankang;Gan Xianping;Shan Zuxiang;Chen Lixiang;Liu Yan(Guangzhou Institute of Geochemisitry,Chinese Academy of Sciences,Guangzhou 510640)(No.711 Team of Northwest CNNC)(Northwest Institute of Non-Ferrous Metal Geology,CNNC)  
After the emplacement of ultrabasic rock in Jianchaling gold mine area,Shaanxi Province,the harzburgites were altered to serpentites under the action of CO2-rich fluid during the later structure-magma stage.Then,the progressive metamorphism of antigorite were happened in the rocks on the condition of green schist to low amphibolite facies,and the mafic rock in the area were metamorphized to form the rodingite.The K-Ar isotope age of albite phenocryst in albitophyre vein is 372Ma,while that of the ground mass in the rock is 337Ma.It means that the acid magmatic activity occurred mainly during 337-400Ma in this area.The K-Ar isotope age of chrome-hydromica associated with the gold mineralization is 144Ma.This implies that the metallogenetic epoch of gold in Jianchaling might be happened in Middle to Later Yanshan movement and related to the later tension of the deep-rift.The gold deposit related to the altered ultramafite of ophiolite is formed by the repeated actions of structure-magma in that structure zone over a long period of time.
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