贵州道真县还打岩地区铝土矿床地球化学特征

摘要

贵州道真县还打岩——陈家榜铝土矿研究区为中国地质调查局铝土矿远景调查项目的新发现矿产地之一，该铝土矿产于石炭系黄龙组（C：h）灰岩侵蚀面上的二叠系大竹园组（P2d）；地球化学研究显示，矿床中Al2O3与TiO2含量成正相关关系，与SiO2含量成负相关关系；不同岩矿石的稀土总量（EREE）含量变化大，LREE／HREE均大于1，轻稀土较富集，重稀土存在不同程度的亏损；铝土矿中Al2O3含量和稀土总量（EREE）呈负相关关系；矿床成因属古风化壳沉积型铝土矿。%Haidayan - Chenjiabang bauxite target area in Daozhen is one of the newly found mineral depos- its of the program ' bauxite exploration potential' of China Geological Survey, this bauxite deposit occurs in Dazhuyuan formation of Permian on the limestone erosion surfaeeof Huanghong formation, Carboniferous Sys- tem. The geochemical study shows the content of A12O3 has positive correlation with TiO2, has negative corre- lation with Si02, the REE content of different rocks changes a lot, both LREE and HREE are more than 1, light REE concentrated and heavy REE has lost of different degree. The content of A12O3 has negative correla- tion with REE in bauxite deposit, the deposit genesis is ancient crust sedimentary bauxite deposit.