DAI Long-sheng1, JIN Zhong-guo2, LI Guang-chun3, WANG Rui-xue1
(1. School of land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Guizhou Nonferrous Metal & Nuclear Industry Geological Exploration Bureau, Guiyang 550005, China;
3. Guizhou Nonferrous Metals Institute of Geological Exploration, Guiyang 550005, China)
Abstract: Xinmin Bauxite Deposit in Daozhen County, Guizhou Province, China is a typical sediment deposit of ancient weathering crust. Orebodies mainly occur as stratified or stratoid beds apparently controlled by the formation, late faults undermine surface continuity of the orebody. Diaspora, boehmite and kaolinite limonite are the major minerals in bauxite ores． Al2O3, SiO2, Fe2O3 and TiO2 are the main components of the bauxite ores with contents of 31.26%－78.38%, 1.06%－47.37%, 1.21%－14.01%, and 0.75%～3.08%, respectively. The bauxite ore is enriched in Cd, Li, Cr, Pb and Ga. But Be and Sc are weak enriched elements in ore-bearing rocks. There are the most enriched elements Li, Ge and Ga in orebody with the content of Ga ranging 23×10-6－119.74×10-6, with the mean of 55.24×10-6, one time higher than the industry available level ( 20×10-6) of associated elements from bauxite. Total amount of rare earth in ore is ranging 22.01×10-6－6339.18×10-6 with HREE and LREE differentiate, and LREE are significantly enriched. Content of Eu in ore shows obvious negative anomaly. Content of Ce in ore displays obvious positive anomaly. Rare elements and REE in the form of minerals may present in aluminum-containing minerals, migration and synchronization aluminum enrichment. Compared with the limestone of Qixia Formation, the Middle Permian limestone of Huanglong Formation, the Upper Carboniferous and mudstone of Hanjiadian Formation, the Mid-Lower Silurian, mudstone of Hanjiadian Formation and bauxite have similar REE patterns and Eu and Ce anomaly characteristics, indicating that mudstone of Hanjiadian Formation is probably the ore-forming mother rock of bauxite.
Keywords: mineral composition ; geochemistry; bauxite deposit; Daozhen County; Guizhou Province
Email: gzkyjzg@sina.com
ACTA MINERALOGICA SINICA Vol. 35, No. 3, 2015, Page 411
