摘要
扶绥铝土矿区位于广西铝土矿成矿带南带的核心区,存在大量火山灰,为更深入地剖析火山灰及其对成矿作用的意义,通过野外地质调查、室内显微镜鉴定及X射线衍射分析法进行研究.结果表明,沉积型铝土矿分为块状、碎屑状和致密状3种类型,堆积铝土矿为沉积铝土矿地表风化、堆积产物,继承了前者的矿石矿物、结构构造特征.铝土矿石中火山灰种类可分为岩屑、晶屑、玻屑和火山尘4种,为玄武岩、安山岩岩屑,长石、石英等基性-中性-酸性矿物.火山灰铝土矿化强烈,常生成水铝石、高岭石、赤铁矿等微细矿物,矿石中总含量大于50%,为铝土矿的重要物质来源.
Abstract
Fusui bauxite mining area is located in the core area of the southern bauxite metallogenic belt in Guangxi,and there is a large amount of volcanic ash.In order to further analyze the volcanic ash and its significance to mineralization,field geological survey,laboratory microscopic identification and X-ray diffraction analysis were used to study the volcanic ash.The results show that sedimentary bauxite can be di-vided into three types:massive,clastic and dense.The accumulated bauxite is the product of weathering and accumulation on the surface of sedimentary bauxite,which inherits the ore mineral and structural character-istics of the former.The types of volcanic ash in bauxite ores can be divided into 4 kinds of rock debris,crys-tal debris,glass debris and volcanic dust,basalt,andesite debris,feldspar,quartz and other basic-medi-um-acid minerals.Volcanic ash bauxite is strongly mineralized,which often produces hydrobauxite,kaolin-ite,hematite and other fine minerals,the total content of ore is more than 50%,which is an important mate-rial source of bauxite.
基金项目
广西地矿局项目(2019-2023)(桂组通字[2019]85号)
广西科技厅项目(桂科AB21196028号)
广西矿产地质志续编与产品服务项目(KD-[2023]-XZ-050)
NETL
NSTL
万方数据