黔中—渝南岩溶型铝土矿含矿岩系特征、控制条件及生成发展模式  

Characteristics of ore-bearing rock series,control conditions and generative development model of karst bauxite deposit in central Guizhou—southern Chongqing

作　　者：刘平[1] 韩忠华[1] 聂坤[1] LIU Ping;HAN Zhonghua;NIE Kun(No.106 Geological Party,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Zunyi,Guizhou,563000)

机构地区：[1]贵州省地质矿产勘查开发局106地质大队,贵州遵义563000

出　　处：《地质论评》2022年第6期2147-2174,共28页Geological Review

摘　　要：早石炭世九架炉组与晚石炭世大竹园组,皆属黔中—渝南岩溶型铝土矿含矿岩系。按岩溶形态组合特征,主要可分为溶蚀洼地型和岩溶湖泊型,两种类型的含矿岩系下段,皆以铁质黏土岩、绿泥石黏土岩为主,间夹赤铁矿层,时夹白云岩、石灰岩透镜体,二者均为永久性、低能、浅水、海源湖泊沉积产物。溶蚀洼地型含矿岩系上段的铝土矿、铝土岩和黏土岩等,皆产于陆地上各种形态的溶蚀洼地中。岩溶湖泊型含矿岩系上段的各种铝土矿、铝土岩和黏土岩等,皆为间歇性、洪控、高能、浅水、陆源湖泊中沉积而成的。因距海较近,在海泛和强风暴潮的影响下,含矿岩系上段的陆相沉积物中时显海相、过渡相沉积特征。在赤道附近有利的地质、气候、水文、植物等条件下,母岩经红土化形成的风化壳物质,被流水短距离搬运到溶蚀洼地和岩溶湖泊中,沉积形成的岩溶型铝土矿含矿岩系,是在同一时间段内连续发生、发展和演化的过程,其间没有明显的间断时期。Jiujialu Formation of Early Carboniferous and Dazhuyuan Formation of Late Carboniferous belong to karst bauxite ore-bearing rock series in central Guizhou and southern Chongqing.According to the characteristics of karst morphology combination,it can be divided into dissolution depression type and karst lake type.The lower part of the two types of ore-bearing rock series are mainly iron clay rock and chlorite clay rock,interbedded with hematite layer,and sometimes intercalated with dolomite and limestone lens.Both are permanent,low energy,shallow water and marine lake sedimentary products.The bauxite,bauxite and clay rocks in the upper part of the dissolved depression-type ore-bearing rock series occur in various forms of dissolved depressions on land.All kinds of bauxite,bauxite and clay rocks in the upper part of karst lake-type ore-bearing rock series are deposited in intermittent,flood control,high energy,shallow water and terrestrial lakes.Due to the close distance from the sea,under the influence of flooding and strong storm surge,the sedimentary characteristics of marine and transitional facies in the continental sediments of the upper part of the ore-bearing rock series.Under favorable geological,climatic,hydrological,plant and other conditions near the equator,the weathering crust material formed by the lateritization of parent rock is transported to the dissolution depressions and dissolution lakes in short distance by flowing water.The karst bauxite ore-bearing rock series formed by deposition is a continuous occurrence,development and evolution process in the same period,during which there is no obvious discontinuous period.

关 键 词：岩溶型 铝土矿含矿岩系特征 控制条件 生成发展模式 黔中—渝南 

分 类 号：P618.45[天文地球—矿床学]