滇西北鹤庆松桂铝土矿地球化学特征  

GEOCHEMCIAL CHARACTERISTICS OF THE SONGGUI BAUXITE DEPOSIT IN HEQING, NORTHWESTERN YUNNAN PROVINCE

作　　者：吴春娇[1,2] 张莉[3] 王根厚[1] 孟献真[4] 桑学镇 周洁[1] 

机构地区：[1]中国地质大学,北京100083 [2]武警黄金第二支队,内蒙古呼和浩特010010 [3]韩国延世大学,韩国首尔120749 [4]安徽省地质测绘技术院,安徽合肥230022 [5]山东鲁地矿业投资有限公司,山东济南250013

出　　处：《地质与资源》2014年第4期383-388,共6页Geology and Resources

基　　金：云南省铝土矿成矿规律与找矿选区研究项目(20100610)资助

摘　　要：研究区矿体产于三叠系中窝组底部油页岩与下伏中三叠统北衙组灰岩、白云质灰岩不整合面上,矿体呈透镜状、漏斗状,受岩浆侵入、岩溶发育影响,矿层厚度不稳定.主要矿石矿物有一水硬铝石和三水硬铝石,呈鲕状、致密豆状、松散状(土状).该矿床的Al/Si比值等岩石化学数据总体反映出Al2O3与SiO2、TiO2含量均成正相关关系.矿石样品∑REE富集,δCe显示正异常,δEu负异常明显.微量元素研究显示出沉积成因特征和成矿物源的多源性,铝土矿矿石结构构造、沉积特点及生物组成反映其形成环境主要为海相沉积环境.The orebodies of researched area are hosted in the unconformity between the Triassic oil shale at the bottom of the Zhongwo Formation and the underlying limestone and dolomitic limestone of Beiya Formation,showing as lenticnlar and funnel-shaped.Impacted by magma intrusion and karst development,the thickness of ore bed is unstable.The ore minerals are mainly diaspore.According to the structure,the ore types can be divided into oolitic bauxite,dense bean-like bauxite and loose （soil-like） bauxite.The lithochemical data of the deposit such as Al/Si ratio generally reflect the positive correlation between Al2O3,SiO2 and TiO2.The ore samples show enrichment of ΣREE,positive anomalies of δCe and negative anomalies of δEu.The study of trace elements indicates the characteristics of sedimentary origin,showing the multi-source of oreforming materials.It could be inferred that the bauxite was deposited in a marine environment.

关 键 词：铝土矿 地球化学元素 鹤庆松桂 滇西北 

分 类 号：P595[天文地球—地球化学]