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我国是世界上一水硬铝石型铝土矿储量最多的国家.矿床主要集中于河南、山西、广西、贵州、山东和云南六省(区),约占总储量98%.笔者对这六省(区)的铝土矿床的矿物学及其成因进行了研究,获得了一些粗浅的认识.一、矿床地质概况我国铝土矿床,所在的大地构造位置,主要分布在东部准地台,即中朝地块、扬子准地台和江南古陆,均位于古陆边缘的石灰岩的侵蚀面上.其含矿岩系可分三类(见表1),成矿时代见表3.矿体为层状、似层状、透镜状和囊状.厚度在0.2～35米之间,走向和倾向随底板灰岩产状而定.矿石化学成分仅广西平果矿为低硅高铁,铝硅比9.27、铝铁比2.94;其余几乎全是高铝高硅低铁,铝硅比3.4—6.2、铝铁比6.9—30的铝矿石.各地区的矿石类
China is the country with the most diaspore bauxite reserves in the world.The deposits are mainly concentrated in six provinces (regions) of Henan, Shanxi, Guangxi, Guizhou, Shandong and Yunnan, accounting for about 98% of the total reserves. Province (area) of the bauxite mineralogy and its causes were studied, obtained some superficial understanding.Geological overview of China’s bauxite deposit, the location of the earth structure, mainly located in the eastern quasi-platform , That is, the Sino-DPRK terraces, the Yangtze Platform and the Jiangnan ancient land are located on the erosion surface of the limestone at the edge of the ancient land. The ore-bearing rocks can be divided into three types (see Table 1). The ore bodies are stratified, stratified, lenticular and cystic. The thickness is between 0.2 and 35 meters, and the trend and tendency depend on the occurrence of limestone in the bottom plate.Only the chemical composition of ore in Guangxi Pingguo ore is low-silicon high-speed rail, Aluminum-silicon ratio of 9.27, aluminum-iron ratio of 2.94; the rest are almost all high-aluminum high silicon low iron, aluminum silicon ratio 3.4-6.2, aluminum-iron ratio of 6.9-30 aluminum ore in all regions