广西平果堆积铝土矿岩溶地貌演化与成矿作用  

Karst landform evolution and mineralization of accumulative bauxite in Pingguo Bauxite Ore,Guangxi

作　　者：祝瑞勤[1,2] 奚小双[1] 吴堑虹[1] 杨震[1,2] 

机构地区：[1]中南大学地球科学与信息物理工程学院,湖南长沙410083 [2]长沙有色冶金设计研究院,湖南长沙410011

出　　处：《中南大学学报（自然科学版）》2011年第3期744-751,共8页Journal of Central South University:Science and Technology

基　　金：中国铝业集团重要科研项目(GX2007CAQB01)

摘　　要：研究了广西平果堆积铝土矿岩溶地貌演化与成矿作用。研究结果表明:广西平果堆积铝土矿风化程度的发展对应于矿区岩溶地貌的演化;地貌分带是矿区岩溶演化的基本规律之一;随着地貌演化过程中岩溶类型的顺序发展,地貌分带形态的变化趋向于不规则;矿区岩溶类型分带对应不同的水系结构,分带地貌演化反映水系发展过程,从水系演化关系指示矿区岩溶在地壳抬升过程中多旋回活动的特征;通过对比那豆与太平—教美矿区,发现堆积矿的分布形态随地貌演化趋向于分散和不均匀,堆积矿成分的变化趋势符合风化过程的一般规律;堆积矿的氧化铝含量经历了从上升到下降的变化过程,与地下岩溶演化程度密切相关;根据岩溶地貌初步恢复了矿区地下小流域水系分布形态,发现岩溶水系发育程度是形成地貌差异和堆积矿变化的基本原因。The karst landform evolution and mineralization of accumulative bauxite in Pingguo,Guangxi was studied.The results show that the weathering degree of accumulative bauxite deposit in Pingguo Bauxite Ore corresponds to the evolution of karst landform.The landform zonation is one of karst evolution laws.With the development of karst types in geomorphic evolution process landform,zonation morphology tends to be irregular.Zonations of karst landform corresponds to different underground stream structures,and the evolution of landscape zonation reflects the development process of stream system.Therefore,evolution of underground stream system indicates the features of karst multi-cycle activities during the process of crustal uplift.Compared with the characteristics of Nadou and Taiping-Jiaomei accumulative bauxite deposits,the distribution patterns of accumulative bauxite gradually become disperse and heterogeneous with the evolution of topography.The changing trends of accumulative bauxite composition meet the basic laws of weathering process.Al2O3 content changes from up to down during the evolution of the accumulative bauxite.This is closely related to the evolution degree of underground karst.Based on the karst landform patterns,the distribution patterns of underground stream system is reconstructed in small karst watershed,the degree of development of karst stream system is the basic reason for topography differences and accumulative bauxite changes.

关 键 词：广西平果铝土矿 岩溶地貌演化 塔状峰林 岩溶流域水系 

分 类 号：P611.2[天文地球—矿床学]