| 鲍淼,韩家家,朱斗圣,谢方旭,林权富,刘刚.黔北务正道地区铝土矿稀土元素地球化学特征与富集规律研究[J].矿产勘查,2020,11(5):936-943 |
| 黔北务正道地区铝土矿稀土元素地球化学特征与富集规律研究 |
| Geochemical characteristics and enrichment laws of rare earth elements in different types of bauxite in Wuzhengdao area,northern Guizhou Province |
| 投稿时间：2019-12-20 |
| DOI： |
| 中文关键词: 铝土矿 稀土元素 地球化学特征 富集规律 务正道 黔北 |
| 英文关键词: bauxite,rare earth elements,geochemical characteristics,enrichment law,Wuzhengdao,northern Guizhou Province |
| 基金项目:贵州省地质矿产勘查开发局地质科研项目(编号:黔地矿科台[(2018)20]号)资助。 |
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| 中文摘要: |
| 稀土元素(REE)特征差异分析,可探寻铝土矿成矿期相关地质信息。通过大量的野外地质调查,含矿岩系不同类型的铝土矿取样,采用电感耦合等离子质谱仪(ICP-MS)对采集样品进行测试分析得出:铝土矿REE总量(ΣREE)具有碎屑状＞土状＞致密块状＞豆鲕状＞黑色炭质页岩的特点；铝土矿在成矿期及成矿后期可能受到淋滤作用导致铝土矿层中的稀土元素轻稀土相对富集,重稀土相对亏损；豆鲕状铝土矿中的金红石、锐钛矿等矿物富集可能是导致重稀土元素的相对富集的主要原因；不同类型铝土矿REE球粒陨石标准化配分模式具有δEu<1,表示Eu负异常,δCe＞1,表示Ce正异常。综合分析认为研究区沉积环境为被动大陆边缘近海湖陆相氧化沉积环境。 |
| 英文摘要: |
| The difference analysis of REE characteristics can explore the related geological information of bauxite mineralization period. In this paper, through a large number of field geological investigations, samples of different types of bauxite in ore bearing rock series are taken, and the samples are tested and analyzed by ICP-MS. It is concluded that the total REE of bauxite (∑REE) is clastic:Clastic bauxite ∑REE＞earthy bauxite ∑REE＞dense massive bauxite∑REE＞pisolitic bauxite∑REE＞black carbon shale ∑REE； The bauxite may be caused by leaching in the mineralization period and later stage of mineralization Rare earth elements in bauxite are enriched in light rare earth, and heavy rare earth elements are relatively deficient； Rutile, anatase and other minerals in pisolite like bauxite may be the main reason for the relative enrichment of heavy rare earth elements；Standardized distribution patterns of REE chondrites in different types of bauxite are δEu<1, indicating negative Eu anomaly,δCe>1, indicating positive Ce anomaly. Based on the comprehensive analysis, the author thinks that the sedimentary environment of the study area is the continental oxidation sedimentary environment of the offshore lake on the passive continental margin. |
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