广西南部与东南亚红土型三水铝土矿床的成因初探  

A preliminary study on the genesis of lateritic gibbsite deposits in southern Guangxi and Southeast Asia

作　　者：张如放 黄卫仁 邓权 张忠伟 ZHANG Rufang;HUANG Weiren;DENG Quan;ZHANG Zhongwei(Guangxi Geological Society,Nanning 530029,Guangxi,China;Guangxi Geological and Mineral Exploration and Development Bureau,Nanning 530022,Guangxi,China)

机构地区：[1]广西地质学会,广西南宁530029 [2]广西地质矿产勘查开发局,广西南宁530022

出　　处：《矿产与地质》2018年第2期269-275,共7页Mineral Resources and Geology

摘　　要：广西南部和东南亚各国风化壳红土型高铁三水铝土矿,其成矿母岩均为高铝岩浆岩及沉积高铝泥岩,在热带—亚热带,高温湿热条件下强烈红土化及化学分解作用,矿物迅速分解,在高原台地排水良好的环境下,活泼的Ca、Mg、K、Na被地表和地下流水迅速带走,而较为惰性的Fe、Al元素残积下来,抱团聚集而形成结核状、粒状、皮壳状、不规则状团块混杂堆积于红土层中,便成了高铁三水铝土矿层,年长月久便达到工业品位,构成具经济价值的风化壳红土型三水铝土矿床。但由于各个成矿区(带)的自然、地理、日照、平均降雨量等等条件不同、成因大体相同,但矿床地质矿产条件殊异。For the laterite-type hydratgillite deposits of high-iron in weathered crust in southern Guangxi and Southeast Asia,the metallogenic hosted-rocks are characterized by high-aluminum magmatic rocks and sedimentary high-alumina mudstones.They are strongly terracialized and chemically decomposed under the conditions of high-temperature moist heat in the tropical and subtropical areas.The strong lateritization and chemical decomposition take place under high temperature,rapid decomposition of minerals,and rapid removal of the active Ca-Mg-Mg-K-Na elements by surface and underground water in the good-drainage plateau terrace.However,the relatively inert Fe-Al elements have accumulated and gathered together to form nodule,granular,crust and irregular lumps mixed up in the laterite layer.With the formation of high iron bauxite layer over a long period of time,ore bauxite grade reaches the industrial grade.The weathered crust laterite type gibbsite deposit with economic value is formed.However,due to the different conditions of nature,geography,sunshine,average rainfall and so on,the geological and mineral conditions of the bauxite deposits are different,but the deposit genesis is similar to each other.

关 键 词：红土型三水铝土矿床 矿化特征 成因 东南亚 广西南部 

分 类 号：P618.45[天文地球—矿床学]