摘要
黎塘碳酸盐岩的红土风化壳成熟度较高，赋存有牧厚的高钦三水型铝土矿。本文分析了红土风化壳分布的地貌单元与碳酸盐岩之间在化学成分和矿物组成上呈渐变关系，认为三水型铝土矿是碳酸盐岩不溶残渣在原地经红土化作用的产物。还通过一个挖穿风化壳的浅井系统采集样品化学分析资料，并与在风化条件下相对稳定的化学组分Ａｌ＿２Ｏ＿３进行对比，计算出基岩与风化壳各层之间的组分得失率及其活动顺序，进而推断红土风化壳形成的物理化学条件和地球化学过程，对该区高铁三水型铝土矿的成因、物质来源和指导找矿具有实际意义。
The maturity of carbnate laterite weathering crust at Litang inGuangxi is higher.Thecrust contains much thicker iron－high gibbsite. Because the crust only lies in the karst plainand the crust has the gradual relation to the carbonate rock in the chemical composition andminerals, it is considered that the gibbsite is the product of autochthonous laterization of thecarbonate rocks. Compared with the relatively stable chemical composition Al_2O_3 under theweathering， the gain and loss ratio of composions between the bed rocks and the crust and ac-tive sequence are calcuIated with the chemical analysis data of the samples from the shaftsacross the weathering crust．And thus the physical－chemical conditions and geochemical processof crust fOrmtion are inferred． The genesis and sources of the iron-high gibbsite ore are de-scribed，which is of practical significance for guiding prospecting ores.
基金
广西壮族自治区科学技术委员会科学研究与技术开发资助
关键词
碳酸盐岩
红土风化壳
三水型铝土矿
地球化学过程
广西
：carbonate rock，laterite weathering crust，gibbsite，geochemical process The paper from one part of the results of the project financed by the scientific research and technologydevelopment of the committee on science and technology of Guangxi Zhuang Aut
