八论贵州之铝土矿——黔中-渝南铝土矿成矿背景及成因探讨

Discussion on the Metallogenic Setting of the Qianzhong-Yu'nan Bauxite in Guizhou and Its Genesis

区域成矿地质背景研究表明 ,铝土矿的形成主要受构造和气候两大因素制约。在地质历史发展过程中 ,广西运动、紫云运动和道真运动对石炭纪沉积铝土矿的形成至关重要。通过对铝土矿为含矿岩系基底地层岩石、微量元素、矿物成分以及铝土矿中各种稳定组分富集率的研究认为 ,各矿带铝土矿都有各自的物源补给区。铝土矿的形成 ,经历了红土化、沉积和表生作用三个阶段 ,每个阶段都是排除杂质和富铝的过程 ,含三水铝石的红土风化壳是沉积铝土矿的成矿母质 ,表生作用使沉积铝土矿再次富集。

The study of the regional metallogenic setting shows that the bauxite generation is chiefly controlled by the tectonic and the climate. In the development of geologic history, three movements including the Guangxi movement, the Ziyun movement and the Daozhen movement are greatly essential for forming sedimentary bauxite of carboniferous. Dealing with the rocks of basement strata of ore-bearing rock series, trace elements, mineral composition and bauxite rate of enrichment in component, it is suggested that every mineral zone of bauxite holds its own recharge area of material sources. The bauxite generation has undergone three stages of laterization, sedimentation and supergenesis, and each of stages is the course of removing impurity and concentrating aluminium. The 3H 2O-bearing laterized crust of weathering is the metallogenic resource material, and supergenesis made the enrichment of sedimented bauxite again.