闽中地区次火山-热液金（银）矿床成矿系列及资源潜力

闽中地区是福建省金银成矿集中区,其上规模成矿主要集中于晚侏罗世次火山活动阶段。次火山-热液金(银)矿床的形成,矿、热、水“三源”是基本必要条件,北西、北东向两组构造带的复合是成矿定位的关键。在断隆带、坳中隆、坳中凹不同构造环境中,相应地递次形成(次)辉绿岩-闪长玢岩、(次)英安斑岩、(次)流纹斑岩等区域次火山-热液金(银)矿床成矿系列的3个亚系列;在垂向空间分布上,自上而下构成(微)细粒浸染型、石英脉型、破碎带蚀变岩型、隐爆角砾岩型、次火山岩型等工业矿床类型分带序列。金矿资源潜力在50t以上。

Mineralization series and resource potential of subvolcanic-hydrothermal Au (Ag) deposits in central Fujian

Central Fujian is an Au-Ag ore deposit concentration area in Fujian Province, and mineralization mainly occurred during Late Jurassic subvolcanic activity. Three sources (mineral, heat and water) were prerequisites for the formation of subvolcanic-hydrothermal Au (Ag) deposits and compounding of the NW and NE sets of structure was the key to the localization of ore deposits. Three sub-series (namely, diabase-dioritic porphyrite, dacite porphyry and rhyolite sub-series) of the subvolcanic-hydrothermal Au (Ag) mineralogenetic series formed in their respective related tectonic environments-the fault uplift zone, uplift in a depression and subbasins in a depression. From above to downward, there occur vertical zoning of industrial ore deposit types, i.e. the fine- and very fine-grained disseminated type deposit, quartz vein type deposit, fractured zone alteration type deposit, cryptoexplosive breccia type deposit and subvolcanic type deposit. The Au resource potential is estimated at more than 50 tons in the study area.