广西龙州-扶绥地区堆积铝土矿地球化学特征研究

Study of geochemical characteristics of accumulative bauxite deposit in Longzhou-Fusui area,Guangxi

广西龙州-扶绥地区铝土矿成矿带为广西三大铝土矿成矿带之一。为探讨成矿物质来源,以净矿石中粒度为准线,统计分析堆积铝土矿主量元素相关性。研究表明Al2O3与Fe2O3、SiO2均呈负相关关系;Al2O3与灼失量呈正相关关系;Fe2O3与灼失量呈负相关关系。金龙、柳桥-山圩两矿床微量元素蛛网图形态基本相同,元素Zr-Hf、Nb-Ta之间具有明显的正相关关系。成矿环境以异地沉积为主导,成矿物质具多源特征,微量元素地化特征显示了明显的半咸水-咸水沉积特征。稀土元素标准化比对,证实本区铝土矿矿源物质均主要源自下伏地层,其中金龙矿床主要物质来源于融县组,柳桥-山圩矿床主要物质来源于茅口组。

Bauxite ore belt in Longzhou-Fusui area is one of the three bauxite metallogenic belts in Guangxi.In order to study the ore-forming material sources,ore granularity for alignment,major element correlation is statistically analyzed for accumulative bauxite deposit with the criterion of middle-grain-size clean ore.The results show that Al2O3 content has a negative correlation with Fe2O3,SiO2 contents,there was a positive correlation between Al2O3 content and the loss of burning.Fe2O3 content is also negatively correlated with the loss of burning.Spider diagram form of trace elements is basically the same as each other in Jinlong and Liuqiao-Shanwei mining areas.There is an obviously positive correlation between Zr-Hf and Nb-Ta.The metallogenic environment is dominated by different place deposition.It is featured by multiple sources of mineral materials,and the geochemical fearues of trace elements show obvious characteristics of sedimentary environment of half-brackish to brackish water.REE standardized comparison,it is confirmed that ore source material of the bauxite are mainly from the underlying strata.The main ore materials of Jinlong deposit are from the Rongxian formation,and the main ore materials of Liuqiao-Shanwei deposit are from the Maokou Formation.