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山西省原平市石墙区铝土矿属于典型的喀斯特型铝土矿。含矿岩系自下而上包括铁质粘土层、铝土矿层、粘土层,且含矿岩系一般包含两个明显的沉积旋回。矿体主体呈层状、似层状产出,矿石结构以隐晶质结构为主,局部出现碎屑和豆鲕粒结构。矿石构造大都为块状构造。矿物学分析显示,硬水铝石、针铁矿、锐钛矿、高岭石是主要的组成矿物,另外还含有石英、伊利石、绿泥石等矿物。地球化学分析显示,主量元素主要包括Al2O3、SiO2、Fe2O3、H2O+及TiO2,微量元素中碱性和碱土元素Li、Sr、Be、Cs、Ba及酸土元素Zr、Hf、Nb、Ta、W均表现为明显富集,且Zr和Hf之间以及Nb和Ta之间具有高度的相关性。地球化学指标Zr/Hf、Nb/Ta以及Eu/Eu*-TiO2/Al2O3图解显示,底板碳酸盐岩是山西省原平市石墙区铝土矿的重要源岩。
Shanxi Province Yuanping stone wall bauxite belongs to the typical karst bauxite. The ore-bearing rocks include iron clay, bauxite and clay from bottom to top, and the ore-bearing rocks generally contain two distinct sedimentary cycles. The main body of the orebody is layered and appears to be stratified. The ore structure is dominated by cryptocrystalline structure, and the debris and bean oolitic structure appear locally. Most of the ore structure is massive structure. Mineralogical analysis shows that diaspore, goethite, anatase and kaolinite are the main mineral components, and quartz, illite and chlorite minerals are also included. Geochemical analysis shows that the main elements include Al 2 O 3, SiO 2, Fe 2 O 3, H 2O + and TiO 2. The contents of trace elements alkaline and alkaline earth elements such as Li, Sr, Be, Cs, Ba and acid earth elements Zr, Hf, Nb, Ta, W All showed obvious enrichment with a high degree of correlation between Zr and Hf and between Nb and Ta. Geochemical indicators Zr / Hf, Nb / Ta and Eu / Eu * -TiO2 / Al2O3 diagram show that the floor carbonate rock is an important source rock in the boulder wall area of Yuanping City, Shanxi Province.