靖西三合铝土矿铝矿物特征及成因机制分析  

Mineral Feature of Bauxite Mine in Sanhe Town of Jingxi County and Its Analysis of Genesis Mechanism

作　　者：俞缙[1] 李普涛[2] 于航波[3] 

机构地区：[1]华侨大学岩土工程研究所,福建厦门361021 [2]桂林理工大学,广西桂林541004 [3]南京大学地球科学系,江苏南京210093

出　　处：《东华理工大学学报（自然科学版）》2009年第4期344-349,共6页Journal of East China University of Technology(Natural Science)

基　　金：华侨大学高层次引进人才科研基金资助项目(08BS414)

摘　　要：以光薄片观察、粉晶X射线衍射分析等多种方法为手段,对靖西县三合铝土矿的硬水铝石和三水铝石的矿物特征进行研究,并探讨其成因机制。分析发现矿石主要由铝矿物、粘土矿物、铁矿物、钛矿物和石英等组成,这些矿物主要以细小微粒或单矿物集合体赋存于矿体中。其中硬水铝石和三水铝石是最主要的铝矿物。硬水铝石主要存在于沉积型铝土矿和堆积型铝土矿矿石中,三水铝石与硬水铝石伴生,主要赋存于堆积铝土矿矿层红土中。研究认为本区三水铝石主要为表生条件下,含铝母岩经红土化风化作用形成,硬水铝石主要为三水铝石经变质作用脱水形成,形成硬水铝石的三水铝石是地质历史上含铝母岩红土化作用形成的。The mineral feature and its genesis mechanism of diaspore and gibbsite in Sanhe mine of Jingxi County are studied with observation of polished thin section, X-ray diffraction in the paper. The analysis shows that the bauxite ores are composed of the aluminium,clay,iron,titanium and quartz ,and the occurrence of those mineral is particle or aggregate in the orebody. The diaspore and gibbsite are the major mineral. The diaspore exists in the ore of sedimentary and accumulation bauxite. The gibbsite exists in the laterite soil of accumulation bauxite bed. It shows that gibbsite in the area is formed from matrices containing alumina through laterization weathering under hypergene conditions and diaspore is mainly formed from degenerated and dewatered gibbsite.

关 键 词：铝土矿 硬水铝石 三水铝石 成因机制 

分 类 号：TD164[矿业工程—矿山地质测量]