贵州威宁地区鱼坝剖面稀土含矿岩系特征

Characteristics of the Ore-bearing Rock Series in Rare Earth of Yuba Section of Weining Area,Guizhou

黔西北地区晚二叠世稀土矿产于峨眉山玄武岩与上伏宣威组假整合面附近。在威宁地区稀土矿分为上、下两层,下含矿层为浅灰白色高岭石粘土岩,上含矿层为浅灰色高岭石粘土岩与铝质高岭石粘土岩,含矿岩系厚度在区域上变化较大,威宁鱼坝剖面含矿岩系完整且厚度较大。通过对威宁县鱼坝剖面含矿岩系的岩矿鉴定、稀土元素分析、XRD测试结果研究,初步认为本区稀土矿形成于温暖、潮湿的环境,海水频繁升降,原地或近源玄武岩/凝灰岩发生风化作用,形成高岭石粘土岩、铝土质高岭石粘土岩,碎屑状粘土岩和粘土质铝质岩的含矿性好,是稀土矿的标志性岩层。

The late Permian rare earth mine in northwest Guizhou are located near the disconformity surface of the bottom of the Xuanwei formation.In Weining area,the rare earth deposits are divided into the upper and the lower layer,and the lower layer is consist of light-gray kaolinite clay rock,and the upper layer is light-gray kaolinite clay rock and aluminum kaolinite clay rock,the thickness of ore-bearing rock series change greatly in this area.In Yuba section,the ore-bearing rock series is complete and thick,the rare earth elements analysis,rock ore appraisal and X-ray powder diffraction quantitative analysis results shows that the Rare earth elements occur as ions in kaolinite clay/aluminite clay,and the rare earth mine formed in the warm,moist and frequent water lifting environment,the kaolinite clay rock and aluminum kaolinite clay rock formed by the weathering and hydrolysis of the basalt and tuff.The clastic clay rock and clayey aluminous rocks have good ore bearing property,they are the typical rock stratum of rare earth mine.