滇东南南秧田两种不同成因类型白钨矿的稀土元素地球化学特征

REE GEOCHEMISTRY OF SCHEELITE OF TWO GENETIC TYPES FROM NANYANGTIAN, SOUTHEASTERN YUNNAN

滇东南南秧田白钨矿矿石类型有两种：矽卡岩型和石英脉型。研究结果表明，不同矿石类型中的白钨矿，在∑REE、LREE／HREE比值、δEN伍和（La／Yb）N比值等地球化学率数方面有着明显的差异．反映出矿石矿物形成于不同的地质地球化学环境。而且，根据白钨矿中稀土元素的组成特征和La、Ce和Y的含量可有效地判别不同矿石类型的成因和物质来源。

There are two types of scheelite ore (skarn type and quartz vein type) in the Nanyangtian scheelite deposit. It is demonstrated that significant differences exist between the skarn type and the quartz vein type in REE geochemistry including ∑REE, LREE/HREE, δEu, (La/Yb)cn, and so on. It is suggested that the different ore types are formed in different geologic and geochemical settings. For this reason, it is effective to determine the material sources and origins of different ore types in terms,of REE geochemistry of scheelite.