| 林 宇.桂西念寅铝土矿稀土元素地球化学特征及物质来源分析[J].地质与勘探,2014,50(1):58-66 |
| 桂西念寅铝土矿稀土元素地球化学特征及物质来源分析 |
| REE Geochemical Characteristics and Material Source of the Nianyin Bauxite Deposit in Jinxi County, Western Guangxi Province |
| 投稿时间：2012-08-30 修订日期：2013-02-06 |
| DOI： |
| 中文关键词: 桂西 铝土矿 稀土 地球化学 |
| 英文关键词: western Guangxi, bauxite ores, REE, geochemistry |
| 基金项目:中国地质科学院岩溶地质研究所基本科研业务费项目(编号2011010)资助 |
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| 全文下载次数: 1926 |
| 中文摘要: |
| [摘要]桂西靖西念寅铝土矿不整合于早二叠茅口灰岩之上，分析其稀土元素地球化学特征对研究其物质来源具有重要意义。对念寅原生铝土矿、堆积型铝土矿及其围岩的11个样品进行稀土元素含量测试，并同靖西、平果等地各类铝土矿、茅口灰岩等样品对比分析,结果表明: （1）念寅铝土矿主量元素主要SiO2、Fe2O3、Al2O3、TiO2组成，Al2O3与Fe2O3和SiO2呈负相关；（2）念寅铝土矿球粒陨石标准化曲线与茅口灰岩配分曲线趋势一致，具有ΣREE富集、LREE与HREE分异且LREE相对富集、Eu负异常等显著特征；（3）念寅铝土矿显示出被动大陆边缘地带海相沉积的典型特征，原生铝土矿成矿物质来源主要为下伏的茅口灰岩。 |
| 英文摘要: |
| Abstract: The Nianyin bauxite deposit in Jingxi county of western Guangxi Province overlies unconformably on the Maokou Formation limestones. It is significant to analyze REE geochemical characteristics of this deposit for the material source of bauxite ores. REE content analysis was performed on 11 samples from accumulation bauxite, primary bauxite and surrounding rocks in the Nianyin deposit, and comparison was made with bauxite samples and limestone samples from Jingxi and those from Ping-guo. The geochemical analyses indicate that the main components of the ores are SiO2, Fe2O3, Al2O3 and TiO2 , and Al2O3 were negatively correlated both with SiO2 and Fe2O3. Chondrite –normalized REE patterns of the bauxite are similar to the Maokou Formation limestone, characterized by the enrichment of ΣREE, differentiation of LREE from HREE, relative enrichment of LREE, and negative Eu anomalies. The bauxite deposit in Nianyin exhibits some typical characters of marine deposition on a passive continental margin, and the Maokou Formation limestone is the major material source for primary bauxite deposits. |
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