Study On Microscopic And Geochemical Characteristics Of Pingguo Primary Bauxite And Spatial Pattern In Guangxi

Pingguo primary bauxite is an important reserve resources for a long time to the primary ore of the research focused on the macroeconomic environment and the forming material source, the spatial distribution of primary ore has not yet been mastered. In this thesis, on the base of the analysis of relevant papers and existing data, the author carry out the research on bauxite ore composition, structure and construction, geochemical characteristics and space distribution constraints by using X-ray diffraction, microscopic identification, main elment, trace elments, REE analysis and so on.The main work and some new understanding as follows:1.Basing on ore character analysis under the microscope, primary bauxite ore is divided into three types. The author identified the spatial distribution of different types of ore:distribution from SE to NW of dense massive ore, pebbly ore and containing a small amount of gravel ore, and summarized micro-characteristics of the three types ore.2.Using microscopy and X-ray diffraction to determine the mineral composition of the ore, the three types of ore inclusive of diaspore, anatase, kaolinite, composed of different types of ore minerals are different:a small amount of dense massive pyrite ore, shown as reducing environment; pebbly chlorite and limonite ore simultaneously, and their formation environment is relatively oxidizing environment; little gravel content of the ore is relatively low diaspore and hematite, goethite, kaolinite higher levels, showing the relative oxidation of the strongest for the mining environment.3.Through analyzing the major elments, trace elments, REE of the three types of ore, the author think the metallogenic environment of primary mine is terrestrial environment. And there by dense massive ore→pebbly ore→containing a small amount of gravel ore with the formation of ore from a relatively oxygen-free environment to oxidizing environment. 4. Making a comparative analysis of the ore composition, structure, construction and geochemical characteristics, it is found that all the referential meaning can corroborate each other. Combined with the spatial distribution of ore, the author sketched out space distribution constraints of Taiping and Nadou:from NW side to the SE side the extent of the oxidation environment gradually increased, and the corresponding surface water→interaction→partial land changes in the environment.