| 四川甲基卡新三号超大型锂矿脉稀土元素地球化学 |
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| 引用本文： | 刘丽君,王登红,代鸿章,侯江龙.四川甲基卡新三号超大型锂矿脉稀土元素地球化学[J].地球科学,2017,42(10):1673-1683. |
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| 作者姓名： | 刘丽君 王登红 代鸿章 侯江龙 |
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| 作者单位： | 1.中国地质大学地球科学与资源学院，北京100083 |
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| 基金项目： | 中国地质调查局项目DD20160346中国地质调查局项目DD20160055中国地质调查局项目DD20160056 |
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| 摘 要： | 四川甲基卡新三号(X03) 超大型锂矿脉是近年发现且价值巨大的锂矿化伟晶岩脉，但相对缺少地球化学的研究，利用ICP-MS测试手段对该矿脉ZK1101钻孔中44件样品进行分析测试，发现该矿脉稀土总量很低(∑REE为0.180×10-6~8.613×10-6，平均值为2.543×10-6)，配分曲线呈右倾斜型，相对富集轻稀土，总体表现铕负异常.围岩的稀土含量与一般片岩相近(∑REE为160.134×10-6~265.881×10-6，平均值为230.718×10-6)，稀土配分曲线总体呈右倾平滑趋势，富集轻稀土，铕为负异常.铕的分布具有特殊性，表现为铕在伟晶岩脉的边部具有显著的正异常.∑REE与Li呈负相关性，δCe与Li则表现为弱正相关性.这一首次发现的低稀土总量和矿脉边部Eu显著正异常的特殊性，对于甲基卡伟晶岩的含矿性评价可能具有重要意义.
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| 关 键 词： | 甲基卡 新三号锂矿脉 稀土元素 铕异常 地球化学 |
| 收稿时间： | 2017-04-18 |
Geochemical Characteristics of REE and Its Implications to X03 Super-Large Lithium Pegmatite Vein,Jiajika, Sichuan |
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| Abstract: | The super-large new No.3 (X03) lithium ore vein is a lithium mineralized pegmatite vein of great value. This paper summarizes the rare earth element (REE) geochemical characteristics by studying the typical drill ZK1101. Results show that the X03 lithium-mineralized pegmatite vein has a very low total amount of rare earth elements (∑REE =0.180×10-6~8.613×10-6, average=2.543×10-6, n=24), the distribution curve is right-inclined type, which means the samples are enriched in LREE and depleted in HREE, and the pegmatite shows negative anomalies of Eu. The host rocks have general REE content (∑REE=160.134×10-6~265.881×10-6, average=230.718×10-6, n=20). The rare earth distribution curve is generally inclined to the right, showing the enrichment of LREE and negative anomalies of Eu. The distribution of Eu in rare earth elements is specific, and Eu has a strong positive anomaly at the edge of the pegmatite vein. ∑REE is negatively correlated with Li, δCe and Li show a slight positive correlation, revealing the inverse correlation between rare earth element and lithium. It also means that the low content of REE is an important prospecting sign for rare metals mineralized pegmatites. |
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