贵州务川濯水地区铝土矿床地球化学特征

贵州务川濯水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之一,该铝土矿产于志留系韩家店组(S1-2hj)页岩或石炭系黄龙组(C2h)灰岩侵蚀面上的二叠系大竹园组(P2d),赋矿围岩主要为炭质页岩和铝土质粘土岩,矿床分布受向斜构造控制;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(ΣREE)含量变化大,LREE/HREE均大于1,显示轻稀土较富集,铝土矿中Al2O3含量和稀土总量(ΣREE)呈负相关关系;矿床成因属古风化壳沉积型铝土矿。

The Geochemistry Feature of Aluminum Deposit in Zhuoshui Area,Wuchuan,Guizhou

The study area of Zhuoshui aluminum in Wuchuan of Guizhou is one of the new finding, which is found by the item of aluminum deposit＇s prospective study in Chinese Geological Survey. This aluminum deposit comes from the P2 d up the erosion surface of the shale in S1-2hj or the limestone in C2 h. The mostly host volcanic rock of the deposit is calcareous shale and alumina claystone. And the distribution of the deposit is controlled by the synclinal structure. The research of the geochemistry shows that, the content of Al2O3 is correlated positive with the TiO2, while negatively with the SiO2. The total of the rare earth element is various from different rock. And the value of the LREE/HREE is more than 1 in usual. The LREE is relative rich. In the rock, the content of the Al2O3 is correlated negative with the total of the rare earth element. And the origin of the deposit belongs to the sediment aluminum deposit in the old crust of weathering.