Geoscience ›› 2011, Vol. 25 ›› Issue (3): 531-544.
• Water Resource and Environment • Previous Articles Next Articles
JIAN Jian-Beng, XIE Biao-Wu, CHEN Hong-Yi, BAI Yan-Ping, TUN Xiao-Lei
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Through the field investigation and structural maping of the Jinshan AuAg mining area in Guangxi Province,the orecontrolling structural regularities have been summarized. On this basis, the prospecting study of geochemistry was carried out in the main orecontrolled fault zone. There are two deposit types in the mining area,one is altered rock type gold deposit which was hosted in the main orecontrolled fault zone,and the other is quartz vein type gold deposit which was hosted in the flank pinnate tension fracture. The different mineralization types were controlled by the different tectonic environment,and they can be a prospecting criteria for each other. The orebody was controlled by the tectonic interface. The mineralization have obviously subenrichment regularity because the orecontrolling fault opened heterogeneously in the mineralization period. The tectonic activities in mineralization period shows the hanging wall of the main fault obliqueslipped toward southeast, accordingly the orebody is SWlateral trending and its depth is greater than extension. The middle of orebody is thicker than both sides,and the exploration line No11 is the enrichment center of mineralization. The concentrations of metallogenic elements,Ag,Au,Cu,Pb,and Zn increased with increasing alteration. Factor analysis show the main metallogenic elements association is Ag,Au,Cu,Pb,and Zn,which can be used as indicator elements.The elements distribution patterns,combination analysis and fractal dimension statistics show that multistage silver and gold mineralization. The zoning sequence of tectonogeochemical primary halo is AuHgAsBiSnSb→MnVAgNiTiCrCoW→MoPbZnCu from upper to down,which shows that the deposit is a shallow denudated deposit and may be superimposed by latestage hydrothernal fluids. On the basis of the analysis of oreforming structures,the magmatic activities,the characteristics of alteration zone and tectonogeochemical primary halo zoning,it can be proposed that the deep and periphery of the mining area have still better prospecting potential. The key zone of prospecting is in the southwest of the exploration line No11.
Key words: AuAg ore deposit, Jinshan,Guangxi, orecontrolling regularity of structure, tectonogeochemistry, metallogenic prognosis
JIAN Jian-Beng, XIE Biao-Wu, CHEN Hong-Yi, BAI Yan-Ping, TUN Xiao-Lei. Analysis of Orecontrolling Structure and Prospecting of Tectonogeochemistry in Jinshan AuAg Mining Area,Guangxi[J]. Geoscience, 2011, 25(3): 531-544.
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