黔西北峨眉山玄武岩顶部Fe-Al岩系特征及其三稀元素富集特点  

Characteristics of Fe-Al rock series on the top of Emeishan basalt in northwestern Guizhou Province and enrichment characteristics of its three rare elements

作　　者：薛洪富 曾道国 向明坤 忙是才 张安 XUE Hongfu;ZENG Daoguo;XIANG Mingkun;MANG Shicai;ZHANG An(Academy of Geological and Mineral Exploration, Guizhou Nonferrous Metal and Nuclear Industry Geological Exploration Bureau, Guizhou Guiyang 550005, China)

机构地区：[1]贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵州贵阳550005

出　　处：《中国地质调查》2021年第5期25-34,共10页Geological Survey of China

基　　金：贵州省“新兴产业矿产资源调查评价(编号:2019-04)”项目资助。

摘　　要：黔西北峨眉山玄武岩顶部普遍发育Fe-Al岩系。为查明峨眉山玄武岩顶部Fe-Al岩系特征,探讨其三稀元素富集特点,开展了针对峨眉山玄武岩顶部Fe-Al岩系的野外调查。调查结果显示当峨眉山玄武岩上覆地层分别为宣威组或龙潭组时,峨眉山玄武岩顶部风化壳Fe-Al岩系表现出明显差异。样品测试结果表明Fe-Al岩系内Sc、Nb、REE等三稀元素含量丰富,具有很好的找矿前景,宣威组Fe-Al岩系内Sc、Nb、REE含量更高,尤其是Nb和REE。Fe-Al岩系内Sc、Nb、REE等三稀元素富集为峨眉山玄武岩风化初始富集和后期改造再次富集作用的结果。The Fe-Al rock series is widely developed on the top of the Emeishan basalt in northwestern Guizhou Province.In order to ascertain the characteristics of the Fe-Al rock series and explore the enrichment characteristics of its three rare elements,the authors carried out a field survey on it.The results show that the Fe-Al rock series as the weathering crust at the top of the Emeishan basalt is apparently different when the overlying stratum is Xuanwei Formation(P3x)or Longtan Formation(P3l).Sample test results show that the Fe-Al rock series is rich in three rare elements such as Sc,Nb,REE,with great prospecting prospects.The Sc,Nb and REE contents of the Fe-Al rock series with Xuanwei Formation(P3x)is higher than that of the Fe-Al rock series with Longtan Formation(P3l),especially Nb and REE.The Sc,Nb and REE concentration in the Fe-Al rock series is an outcome of combined action of the initial enrichment weathering and the late beneficiation reformation on the Emeishan basalt.

关 键 词：Fe-Al岩系 三稀元素 元素富集 峨眉山玄武岩 黔西北 

分 类 号：P588.22[天文地球—岩石学] P588.145[天文地球—地质学]