LI Yu-jiao1,2, ZHANG Zheng-wei1, ZHOU Ling-jie1,2, WU Cheng-quan1,2
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: Zunyi metallogenic area is one of the main metallogenic areas of bauxite in Guizhou deposit occurred within the Lower Carboniferous Jiujialu Formation mostly. Researches on bauxite of mineralogical characteristics such as mineral composition, content and crystal morphology were carried out, by means of thin section analysis, X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) analysis. Result shows that there is difference between the crystal morphology of diaspore in different horizon in the process of bauxite mineralization. In addition, the content of diaspore increases with decreasing contents of clay mineral and quartz. At the same time, systematical study on fabric and element geochemistry of ore-bearing rock series shows that the source of Zunyi bauxite deposit is homologous and relates to the basement. In the process of bauxite mineralization, the parent rock has full homogenization in the alternation of oxidation-reduction of sedimentary environment, showing that the mineralization process is consistent with ancient weathering crust. Therefore, the mineralogicaland geochemical features indicate prospecting and mineral processing indication meaning for bauxite deposit.
Key words: bauxite; mineralogy; geochemistry; Zunyi; Guizhou Province
ACTA MINERALOGICA SINICA Vol. 34, No. 2, 2014, Page 234-246
