江西修水县梅子坑钼矿床地质特征及成因初探

梅子坑钼矿位于九岭钨钼成矿带,为中型石英脉型钼矿床。矿区内地层和岩浆岩钼元素含量分别是克拉克值的43倍和21倍。矿体赋存于双桥山群修水组浅变质岩系中及北西向断裂控制的裂隙密集带中;矿石主要类型为石英脉型,矿石有益组分为辉钼矿,形成于石英-黄铁矿-辉钼矿-黄铜矿早期矿化阶段。矿床可能与隐伏的燕山期细粒花岗岩、花岗斑岩岩脉有成因关系,属与燕山期岩浆活动有关的中-高温热液矿床。北西向断裂密集带,硅化、云英岩化、黄铁矿化围岩蚀变,燕山期花岗岩类及双桥山群浅变质岩系,是其主要找矿标志。

Geological characteristics and genesis of the Meizikeng molybdenum deposit,Xiushui county,Jiangxi Province

Meizikeng molybdenum deposit,located in the Jiuling tungsten-molybdenum mineralization belt,is a medium-sized quartz vein-type molybdenum deposit.Mo abundance of strata and magmatic rocks is 43 and 21 times of Clark value,respectively.Ore-bearing quartz veins are hosted in dense fissure belts controlled by NW-trending faults in the low metamorphic rocks of Proterozoic Xiushui Formation, Shuangqiaoshan Group.Ore types are mostly quartz veins.The useful component is molybdenite formed in the quartz-pyrite-molybdenite-chalcopyrite of early mineralization stage.It is a mesothermal to hyperthermal deposit related to the blinded Yanshanian fine-grained granite or granite-porphyry dykes.The main prospecting indicators include intensive NW-trending dense fissure belts,silication,greisenization and pyritization rock alterations,as well as metamorphic rocks of Shuangqiaoshan Group intruded by Yanshanian granitoid.