桂西二叠纪喀斯特型铝土矿地质成矿过程

桂西二叠纪喀斯特型铝土矿是第四纪萨伦托型铝土矿的矿源层，但是其具体成矿地质过程并不清楚.在矿带东部平果矿田1∶5万区域地质调查基础上，针对性地对二叠纪铝土矿床进行了合山组含铝岩系基本层序、铝土矿成矿物质来源、古喀斯特地貌对铝土矿的控制作用及含铝矿物生成顺序的研究，并阐述了该类型铝土矿从源岩风化到搬运沉积的具体成矿过程.综合前人研究成果，提出桂西二叠纪喀斯特型铝土矿的四阶段成矿模式，分别为孤立台地隆升接受火山喷发沉积物阶段、原地深度风化阶段、积水潜育化阶段和埋藏成矿阶段. 

Mineralization Process of Permian Karst Bauxite in Western Guangxi

The Permian karst bauxites in western Guangxi are the source material of the Quaternary Salento bauxites,but their specific mineralization process is still unclear. Based on the 1:50 000 regional geological survey,this paper reveals concrete mineralization process of Permian bauxite from source rock weathering to transport deposition in western Guangxi by focusing on basic sequence of bauxitic series in Heshan Formation,source materials of bauxitic ore,paleokarst control of bauxite mineralization and generation sequence of aluminous minerals of the Permian bauxite deposits and occurrences. Integrating previous studies,it is proposed that geological process of Permian karst bauxite in western Guangxi includes four mineralization stages,namely uplifting of isolated platform and receiving volcanic materials,in-situ deep weathering,waterlogging gleization and buried mineralization.