鄂东南石煤钒矿地质特征及找矿标志

Geological Characteristics and Prospecting Indicators of Stone-like Coal Vanadium Ore in Southeastern Hubei

鄂东南地区黑色岩系主要赋存在寒武系,黑色页岩中蕴含着丰富的Mn,p,Ag,Au,V,U等矿种,调查发现在下寒武统水井沱组多处发育石煤钒矿段。已有工作成果显示,在狮古尖矿段和石坳金矿段具有工业意义的钒矿体有3个,经岩矿鉴定,钒矿石自然类型为炭质泥岩型,矿石的结构主要为泥状结构,且普遍被炭质渲染,其次有微粒泥状、微粒团粒、球粒等结构,矿石构造以层状、片状为主;矿石成分主要由炭质、石英、绢云母组成,其次为高岭石、黄铁矿等以及其它微量矿物;石煤与钒矿共生,两者厚度成正相关关系,即石煤发育的地段钒矿也发育。研究认为鄂东南石煤钒矿床是典型的黑色岩系中发育的沉积矿床,其沉积时的古地理环境为扬子古地台东南侧大陆边缘浅海盆地,盆地处于缺氧的还原环境,藻类生物茂盛,沉积物以陆源碎屑为主;寒武系下统水井沱组为本地区石煤钒矿的找矿标志。

The black rock series is mainly hosted in Cambrian System in southeastern Hubei. In the black shale contains abundant ores of Mn, P, Ag, Au, V and U elements. Prospecting has found in the lower Cambrian Shuijingtuo Formation developed vanadium ore sector in stone-like coal in many places. Available data have demonstrated that in the Shigujian and Shiao vanadium ore sectors have 3 ore bodies with commercial significance. The rock and mineral analyses have considered that the natural type of vanadium ore belongs to carbargillite. Ore textures have mainly carbonaceous rendering muddy texture, then microgranular, micropellet and spherulitic textures. Ore structures are mainly stratified and schistose. Ore composition is mainly carbonaceous matter, quartz and sericite, secondly kaolinite, pyrite and other trace minerals. Vanadium ore is associated with stone-like coal, both formed a positive relationship, that is to say where stone-like coal developed, vanadium ore too. The study has considered that the ore is typical sedimentary mineral deposit developed in black rock series, paleogeographical environment was a shallow sea basin stood in an anoxic reducing environment on the southeast margin of the Yangtze platform with luxuriant algae; sediment is mainly terrigenous clastic debris. The lower Cambrian Shuijingtuo Formation is a prospecting indicator of stone-like coal vanadium ore.