| 内蒙古东七一山萤石矿床的稀土元素地球化学特征及成因 |
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| 引用本文：.2002.REE Geochemistry and Genesis of Dongqiyishan Fluorite Deposit,Inner Mongolia [J].Mineral Deposits,21(3):311~317 |
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| 基金项目:国家地质大调查项目(编号： K1.3.32) |
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| 中文摘要:运用等离子质谱和等离子体光谱对内蒙古东七一山萤石矿的萤石矿石和围岩样品的稀土元素进行了系统分析。结果表明，矿石的∑REE<30×10-6，LREE为5×10-6～15×10-6，HREE<5×10-6，Y<20×10-6；而围岩的∑REE>290×10-6，LREE>240×10-6，HREE>40×10-6，Y>70×10-6。可将萤石矿石的稀土元素的分布型式分为轻、重稀土富集型两类：一类矿石的∑REE多小于29×10-6，LREE/HREE和La/Yb分别大于7和12，δEu、δCe的变化范围分别为0.85～1.10，Ce、Eu基本不显异常；另一类的∑REE 约18×10-6，LREE/HREE和La/Yb分别小于3和2，δEu为0.45～0.70，δCe为0.70～0.90，具明显的负Eu异常，Ce微具负异常。矿石与围岩的稀土地球化学研究显示，该萤石矿系岩浆热液成因。 |
| 中文关键词:稀土元素 萤石 热液流体 东七一山 内蒙古 |
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| REE Geochemistry and Genesis of Dongqiyishan Fluorite Deposit,Inner Mongolia |
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| Abstract:ICP-MS and ICP-AES methods were used to analyse ore and wall rock samples from the Dongqiyishan fluorite deposit,inner Mongolia. The analytical results are as follows: for ore samples, ∑REE<30×10-6, LREE: 5×10-6～15×10-6, HREE<5×10-6, and Y<20×10-6; for wall-rock samples, ∑REE>290×10-6, LREE>240×10-6, HREE>40×10-6, and Y>70 ×10-6. According to the REE chondrite_normalized graphs, this paper divides the distribution patterns of rare earth elements from the ores into two types: LREE_enriched type and HREE_enriched type. As far as the former type ore is concerned, ∑REE is often lower than 29×10-6, and LREE/HREE and La/Yb are usually higher than 7 and 12 respectively. δEu and δCe range from 0.85 to 1.10. As a rule, neither Ce nor Eu has abnormal content. For the latter type ore, however, ∑REE≈18×10-6, LREE/HREE and La/Yb are frequently lower than 3 and 2 respectively. δEu lies between 0.45 and 0.70,δCe occurs between 0.70 and 0.90, Ce displays weak negative anomaly, and Eu exhibits obvious negative anomaly. Based on the study of the REE geochemistry of the ores and wall rocks, the authors consider that the fluorite deposit originated from magmatic hydrothermalism. The paper also probes into the metallogenic mechanism of the fluorite deposit. |
| keywords:rare_earth element, fluorite,hydrothermal fluid, Dongqiyishan, Inner Mongolia |
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