摘要
Abstract
The bauxite deposits in southeastern Yunnan Province are typical karst bauxite deposits.The orebo-dies occur in the Upper Permian Wujiaping Formation (Longtan Formation).It is significant to analyze geo-chemical characteristics of this deposit for the material source of bauxite ores.Whole rock analysis reveals Al2 O3 ,Fe2 O3 ,SiO2 and TiO2 are the main components of the bauxite ores.And Al2 O3 has a negative relation-ship with Fe2 O3 and SiO2 .Trace elements such as Cr,Zr,Hf,Ta,Th,U and REE were enriched during the bauxitization process.Elements of Zr and Hf,Nb and Ta display significant correlation with each other.Studies of bivariate plots of lgCr-lgNi,immobile elements ratios such as Zr/Hf,and REE pattern suggest that the Emeishan basalts are the major source of materials for the bauxite formation.And the underlying limestones may provide some source of materials for the formation of bauxite ores.关键词
铝土矿/地球化学/物质来源/滇东南Key words
bauxite/geochemistry/source of ore-forming materials/southeastern Yunnan Province分类
天文与地球科学
