西藏冈底斯成矿带南木林县浦桑果铜多金属矿床是新发现的大型铜多金属矿床,该矿床以品位高,成矿元素复杂为其特征.本文应用野外地质编录、显微镜鉴定、电子探针等手段对浦桑果矿床矿石矿物特征以及Co、Ni元素赋存状态进行了研究.矿石矿物主要由黄铜矿、方铅矿、闪锌矿、铜蓝等组成.矿石中的有用元素除了铜、铅锌、银外,钴、镍元素是伴生有益组分,矿石中主要Co-Ni元素独立矿物为镍辉砷钴矿.通过电子探针分析,Co元素含量平均为17.87％,Ni元素含量平均12.66％,Co-Ni元素同时以类质同象置换铁的形式赋存于金属硫化物中,黄铜矿平均含Co 0.04％、Ni 0.08％,黄铁矿平均含Co 0.40％、Ni 0.20％,闪锌矿平均含Co 0.14％、Ni 0.06％,磁黄铁矿平均含Co 0.79％、Ni 0.18％等.Co-Ni元素作为重要的伴生矿产,对提高矿床综合利用价值,丰富青藏高原矿床类型,指导找矿工作部署具有重要的意义.%Located in the Namling Country of Tibet, the Pusangguo copper polymetallic deposit is a skarn-hydrothermal vein type deposit and lies in the eastern part of the Gangdise belt. The ore mineral compositions and the modes of occurrence of Co-Ni were systematically studied in this paper. The ores are made up of some complex medium-low temperature hydrothermal minerals, such as chalcopyrite, pyrite, galena, marmatite, pyrrhotite and covellite. The modes of occurrence of Co-Ni revealed by means of microscope and rnscanning electron microprobe indicate that Co-Ni are mainly present as cobaltite (Co 17.87%, Ni 12.66%); and are also scattered in ferrous sulfides, such as chalcopyrite (Co 0.04%, Ni 0.08%), pyrite (Co 0.40%, Ni 0.20%), sphalerite (Co 0.14%, Ni 0.06%), and pyrrhotite (Co 0.79%, Ni 0.18%), in which Co-Ni exist in the form of isomorphous replacement of Fe. The results indicate that there exists a new type of mineralization in the Gangdise belt, and this discovery supplies important information for further exploration.
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