几内亚共和国博凯地区红土型铝土矿地质特征和成矿机理初探  

Geological character and ore mechanism of lateritic bauxite depositsin Boke,Guinea

作　　者：徐红伟[1] 张先忠[1] 

机构地区：[1]河南省地质矿产勘查开发局第二地质队,郑州454001

出　　处：《长春工程学院学报（自然科学版）》2009年第1期87-91,共5页Journal of Changchun Institute of Technology：Natural Sciences Edition

摘　　要：几内亚博凯地区红土型铝土矿为基性火山岩经风化淋滤形成的残积型铝土矿,其地质特征为地表形成铁铝质风化壳(铁帽),下部为松散状铁红土,其形成机理为:在植被发育,微生物滋生的炎热潮湿环境,随着富铝质岩石的分解,"SiO2"在碱性溶液环境中形成硅酸胶体活化迁移,铁铝沉淀富集形成红土型铝土矿。In Boke, Guinea, the lateritic bauxite is residual bauxite formed from basic lava with weathering and leaching. The geologic feature is that the surface is Fe -Al weathering crust （iron cap）, and the bottom is loose ferruginous laterite, whose formation mechanism is： in hot humid environment that vegetation developing and microbes breeding, along with Al -enriching rock＇s breaking down, SiO2 forms silicic acid colloid activating migration in alkaline solution, and Fe -Al deposits and enriches, then forming lateritic bauxite.

关 键 词：几内亚 红土化作用 红土型铝土矿 铁质壳 成矿机理 

分 类 号：P571[天文地球—矿物学]