Geochemical Characteristics and Sedimentary Environment of Li-Rich Bauxite in the Caijiaba Bauxite Deposit,Central Guizhou Province
The Caijiaba bauxite deposit in Qingzhen,Guizhou is one of the newly discovered bauxite deposits in the central Guizhou bauxite deposit area in recent years. The bauxite deposits were layered and quasi layered,and occurred in the Lower Carboniferous Jiujialu Formation. This study conducted detailed mineralogical and geochemical studies on the core profiles of aluminum bearing rock series in the Caijiaba bauxite deposit. The aluminum bearing rock series in the Caijiaba bauxite deposit exhibits obvious Li hyperaccumulation. The research results indicate that all samples of aluminum bearing rock series contain high concentrations of Li (210～2480) ×10-6. Among them,ten pieces of bauxite rock have Li content of (210～2480)×10-6 (average 1198.9×10-6),and three bauxite ores contain Li content (412～1440)×10-6 (average 980.7×10-6),showing obvious super enrichment characteristics. Optical microscopy and XRD analysis show that the lithium rich bauxite rock was mainly composed of illite,kaolinite,and chlorite,as well as a small amount of hard alumina,boehmite,pyrite,and rutile. Based on mineralogical and geochemical evidence,Li was mainly present in clay minerals such as kaolinite and illite in the study area. When the Al2O3 content in bauxite ranges from 30％ to 40％ and the Al2O3/SiO2 ratio ranges from 1 to 1.5,Li was most enriched in bauxite. Element geochemical analysis shows that the lithium rich bauxite rocks in the study area were formed in a warm,humid,and relatively oxidized terrestrial freshwater environment.
bauxiteLi-rich bauxite rockJiujialu Formationoccurrence statesedimentary environmentCaijiabacentral Guizhou Province
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维普
