黔东南凯里—黄平地区古喀斯特地貌特征及其对铝土矿成矿的控制

Geomorphic characteristics of the Palaeo-Karst and its ore-controlling process on the bauxite deposit in the Kaili-Huangping area,southeastern Guizhou

凯里—黄平地区铝土矿床位于扬子准地台与华南褶皱带的交接地带,属于黔北台隆遵义断拱的贵阳复杂构造变形区,赋矿层位为中二叠统梁山组。通过搜集大量的工程数据,利用Surfer软件分析铝土物质沉积时的古喀斯特地貌,统计赋存于不同地貌的典型矿体特征,发现古喀斯特与铝土矿体规模、形态及矿石质量关系密切。据此,笔者研究了古喀斯特对铝土矿成矿的控制作用,认为其对于铝土物质的形成、沉积保存以及铝土矿的次生富集均起着重要的作用。

The Bauxite deposits located in the Kaili-Huangping area,are distributed in the junction part between Yangzi plat-form and Huanan fold belt,which belongs to the Guiyang complex deformation area,the host rock of Bauxite deposits is the Liangshan formation of Permian.By collecting large amount of data,the authors analyze the geomorphic landform of the palaeo-karst where the bauxite deposit formed using Surfer software.By summarizing characteristics of the typical bauxite deposits located in the different karst areas,it is concluded that the palaeo-karst geomorphology is closely related to the scale of the bauxite orebody and the quality of bauxite ore.Thus,the authors analyze the ore-control process of the bauxite deposition,and concluded that the palaeo-karst played an important role on the formation of the bauxite material,deposition,preservation,and secondary bauxite enrichment.