豫西铝土矿矿床地质特征

Geological Characteristics of Bauxite Deposits in Western Henan Province

通过对支建、贾家洼、石寺铝土矿床综合对比研究,认为豫西铝土矿是赋存于上石炭统本溪组,产在古岩溶侵蚀面上的一水硬铝石沉积型铝土矿床。矿体呈(似)层状、透镜状,长100～3500m,厚0.5～52.79m,Al2O343.8%～78.59%,A/S2.2～36.9。矿石化学组分:剖面上矿层中部Al2O3、A/S高,SiO2低;上下部Al2O3、A/S低,SiO2高;Fe2O3和S底部高,中上部低。平面上矿层中部Al2O3、A/S高,SiO2低;边部Al2O3、A/S低,SiO2高,矿石品位与矿体厚度成正相关。此分析,对豫西地区铝土矿的地质找矿及发现新矿床具有一定的指导意义。

Based on the comprehensive comparison among bauxite deposits of Zhijian, Jiajiawa and Shisi. The authors believe that the bauxite deposits in western Henan Province belong to diasporite sedimentary bauxites deposit which exist in Benxi Formation of Upper Carboniferous and form on the erosion surface of ancient karst. The orebody, 100 to 3 500 m long and 0.5 to 52.79 m thick,is layered and lenticular with the ratio of A1203 ranged from 43.8% to 78.59% while A/S from 2.2 to 36.9. As the chemical components of ores in section are concerned ,the Al2O3 and the ratio of A to S are high in the middle part and low in the upper and lower part, SiO2 low in the middle part and high in the upper and lower part. Fe2O3 and S are high in the lower part and low in the middle and upper part. As the chemical components of ores in plane are concerned,the Al2O3 and the ratio of A to S are high in the middle and low at the edge;the SiO2 is low in the middle and high at the edge, ore grade is positive correlation with thickness of ore body. It is of certain guiding significant for geological prospecting and new deposit discovery of bauxite in western Henan Province.