Geologoical and Geochemical Characteristics of the Shiqiang Bauxite Deposit in Shanxi Province

详细信息   

• 责任者：Sun Silei(State Key Laboratory of Geological Processes arut Mineral Resources ; China University of Geoscienees ; Beijing 100083 ; China) ; Wang Qingfei
• 刊名：Geology and Prospecting
• 出版年：2012
• 卷期：48(3)
• 关键词：铝土矿 ; bauxite deposit ; 山西 ; Shanxi Province
• 页码：p.487-501
• 图表：illus., 44 tables, 2 refs.
• 分类号：1001,1002
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

摘要

The Shiqiang bauxite deposit in Yuanping City of Shanxi Province is a typical karst one. The ore-hosted strata are ferruginous clay layer, bauxite layer and clay layer in an upward sequence, which comprise two obvious sedimentary cycles. The orebodies mainly occur as stratified or stratoid beds and the ore textures are predominantly cryptocrystalline with elastic or oolitic texture being locally present. The massive structure is dominated in bauxite ores. Mineralogical analysis reveals that diaspore, goctbite, analase and kaolinite are the major minerals in bauxite ores with small amounts of quartz, illite and chlorite. Geochemical analyses indieate that Al2O3 , SiO2 , Fe2O3 , H2O＋ and TiO2 are the main components of the bauxite ores, and trace elements such as alkaline and alkaline earth elements Li, Sr, Be, Cs, Ba and acid earth elements Zr, Hf, Nb,Ta, W were significantly enriched during the banxitization process. In addition, Zr vs. Hf and Nb vs. Ta show a high degree of correlation. The diagram of geochemical indexes such as Zr/Hf, Nb/Ta and Eu/Eu ＊ -TiO2/Al2O3 illustrates that the carbonatite is the primary material source of the bauxite ores in this deposit.