大团山层状铜矿床中伴生有不同规模的钼矿体.钼矿主矿体赋存于角岩夹矽卡岩和黑色含钼碳质页岩中.矿石手标本中,矿石矿物的颗粒非常细小,难以靠肉眼或矿相显微镜进行鉴别.通过电子探针面扫描,发现钼主要以微小的鳞片状辉钼矿的形式,分布于穿插切割矽卡岩或碳质页岩的石英-方解石脉中.这类石英-方解石脉形成晚于矽卡岩或碳质页岩,通常与岩浆热液活动有关,故推断钼矿化主要与岩浆热液作用有关,辉钼矿Re-Os年龄代表着岩浆热液成矿作用的时代.%Molybdenum orebodies of various sizes are associated with the Datuanshan stratiform copper deposit.The main orebody principally exists in homfels with skarns and molybdenum-bearing black shale.The grains of the molybdenite have always been so tiny that it is impossible to recognize them either with naked eye or even under a microscope.With the aid of an electron microprobe,the authors managed to identify the molybdenite for the first time in the ore rocks.The molybdenum exists in the form of molybdenite,and the micron-sized scale-shaped molybdenite grains are distributed in the quartz-calcite veins that cut through the skarns and black shale.This type of quartz-calcite veins,which formed after the skarn and black shale,were usually produced by magmatic-hydrothermal processes.Thus the molybdenite mineralization was probably derived from magmatic-hydrothermal fluids.The Re-Os ages of molybdenite must indicate the time of magmatic-hydrothermal mineralization in the orefield.
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