湖南三岔镍钼多金属矿床矿物学特征研究

湖南张家界三岔镍钼多金属矿床是华南下寒武统黑色岩系矿床中的典型实例,是国内外学者的研究热点。目前,对该地区的岩石矿物微观形态特征、矿物间的关系以及形成次序研究不够深入。本次研究对矿床矿石矿物进行了详细的矿相显微镜、电子探针以及扫描电子显微镜的观察与分析。结果显示,镍的主要赋存形式为针镍矿、辉砷镍矿、针镍矿与黄铁矿紧密共生,形态主要呈脉状、浸染状以及碎块状;而钼的赋存形式主要以碳硫钼矿为主,以竹叶状、团块集合体、椭球体形式存在。通过对矿物间的穿插、包裹关系进行研究,其形成次序依次为黏土类矿物、石英、磷酸盐矿物-碳硫钼矿-针镍矿、辉砷镍矿-方解石、重晶石、石英,而黄铁矿伴随着整个成矿过程,其成矿期阶段可划分为-沉积阶段-热液阶段-再改造阶段。

Mineralogical Characteristics of Ni-Mo Polymetallic Deposits in Sancha,Hunan Province

The Sancha nickel-molybdenum polymetallic deposit in Zhangjiajie of Hunan Province is a typical example of the Lower Cambrian black shales of South China and is a hotspot of scholars at home and abroad.By the relatively comprehensive analyses including mineral microscopicobservation,electron microprobe analyses and scanning electron microscope observation, the results showthat the main forms of nickel are millerite and gersdorffite;the morphology is mainly veins or disseminated and fragments filled in the early formation of minerals, or with pyrite, sphalerite and other closely symbiotic; and the forms of molybdenum mainly include MoSC, which is existence in the form of breccia, block aggregates or ellipsoid. Through the study of the relationship of mineral interspersed, the formation order of these mineralsis:clayminerals,quartz,phosphateminerals;molybdenumore;millerite,gersdorffite;calcite,