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《Earth Science(Journal of China University of Geosciences)》 2009-02
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Tectono-Magmatic Evolution Related to Metallogenic System in Gejiu Ore-Concentration Area,Southeast Yunnan of China

XU Qi-dong1,2,XIA Qing-lin1,2,CHENG Qiu-ming1,21.Faculty of Earth Resources,China University of Geosciences,Wuhan430074,China2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan430074,China  
Gejiu ore-concentration area is one of the most important occurrences of Sn-Cu polymetallic mineralization in Southeast Yunnan.Sn-Cu polymetallic system of mineralization in the area includes Sn-W greisen-quartz vein type,Cu-massive-sulfide cassiterite type,Cu-Sn altered-basic-rock type,and Sn-Pb-Zn vein types of deposits.The study of the relationship between the tectono-magmatic evolution and the Gejiu system of mineralization shows that Sn-Cu polymetal enrichment occurred in and near the contact zone between granite and wall rock through contact metamorphism,metasomatic and filling processes,when the composite granites invaded into folded limestones of Middle Triassic(Gejiu Formation).These metals may come from two reservoirs,i.e.granitic magma originated from the middle-lower crust in the Yenshan period and basalt-diabase-gabbro from the mantle in the Indo-Chinese period.Pulsatory magmatic activities are believed to be the main driving force for the formation of the hydrothermal system for the ore-forming progress.A regional model of mineralization is proposed in this study for assisting mineral exploration and prediction for new types of mineral deposits in this area.
【Fund】: 中国地质调查局项目“重要矿产资源三维预测评价方法与示范”(No.1212010633810);; 教育部创新团队基金(No.IRT0755);; 地质过程与矿产资源国家重点实验室科技部专项经费资助
【CateGory Index】: P618.4
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