贵州遵义镍-钼富集层中独居石的发现及成因意义

Discovery of monazite in the Ni-Mo sulfide layer of Zunyi,Guizhou Province,and its genetic significance

对贵州遵义天鹅山-黄家湾镍-钼富集层中镍-钼矿石进行了电子探针研究,在镍-钼矿石中发现了稀土独立矿物——独居石,呈不规则的细粒、蠕虫状分布于矿石中,并与镍、钼的独立矿物共生;独居石La和Ce的含量高(La2O3含量变化范围为25.70%～30.52%,Ce2O3含量变化范围为22.96%～27.68%),贫Sm、Th(Sm2O3含量的变化范围为0.49%～0.80%,ThO2含量的变化范围为0%～0.19%),具有热液成因独居石的化学成分特征。镍-钼矿石中稀土矿物独居石的发现为镍-钼矿层的热液成因提供了直接的矿物学证据。

A REE-bearing mineral, i. e., monazite, was discovered in the Ni-Mo ore from the Tian＇ eshanHuangjiawan Ni-Mo sulfide layer of Zunyi, Guizhou Province, on the basis of electron microprobe analysis. The monazite is distributed as fine scattered particles and vermicular aggregates in the Ni-Mo ore, coexistent with Ni- and Mo-bearing minerals. High La and Ce contents （La2O3 ： 25.70% --30.52%, Ce2O3 ： 22.96% --27.68% ） and low Sm and Th contents（Sm203 ： 0.49 % -0.80 %, ThO2：0 % -0.19 % ）of the monazite show the characteristics of hydrothermal generated monazite.