Evolution and Metallogenic Specificity of Ore-Forming Porphyry in Dexing Copper Deposit
Dexing copper deposit is a porphyry copper deposit that has attracted much attention in China and even the world.From northwest to southeast,it can be divided into three mining areas:Zhushahong,Tongchang and Fujiawu.Granodiorite porphyry is recognized as the main source of its mineralization.Based on the previous research results,the characteristics of granodiorite porphyry in the three mining areas were compared through field geological exploration,petrology and rock geochemistry,and the magmatic evolution law and metallogenic specificity were discussed.The results show that the porphyry from the northwest to the southeast has the characteristics of increasing acidity and alkalinity,the late enrichment of some large ion lithophile elements,and the consistency of rare earth element distribution patterns.It shows that the granodiorite porphyry magma of the three mining areas has homology,and evolved in the process of magmatic intrusion,and the evolution direction is from Zhushahong to Fujiawu.However,it is found that the trace elements in the Fujiawu rock mass are slightly different from those in the Zhushahong and Tongchang rock masses,and the rare earth element ratio shows that the Fujiawu rock mass is not homologous to the other two,which indicates that the Fujiawu porphyry is mixed with foreign materials or more complex geological mixing during the differentiation and evolution of magma.Combined with the comparison of the evolution stage of magma and the characteristics of metallogenic specificity,it is found that the better stage of mineralization is often the late stage of diagenesis,which has practical significance for the follow-up prospecting and exploration work.
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