| 福建余朋—南口火把山萤石矿地质特征及成因 |
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| 引用本文：刘殿鹤,王春连,张雪花,余小灿,颜开,刘思晗,周博文,游超,刘雪,尹传凯.2022.福建余朋—南口火把山萤石矿地质特征及成因[J].地球学报,43(3):383-392. |
| DOI：10.3975/cagsb.2022.042001 |
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| 基金项目:中央级公益性科研院所基本科研业务费专项(编号: KK2005);中国地质调查局地质调查项目(编号: DD20190816; DD20190606) |
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| 中文摘要:笔者总结了福建余朋—南口地区火把山萤石矿床的地质特征, 并通过萤石的微量元素及稀土元素地球化学特征, 探讨了矿床的成因及成矿物质、流体来源。萤石矿石的微量元素及稀土元素结果显示: 火把山萤石呈中等Eu负异常及弱Ce异常, 稀土元素配分模式具有轻稀土富集型及轻稀土弱亏损的平缓型等两种曲线型式。根据萤石矿石特征、微量元素、稀土元素等特征及Y/Ho-La/Ho图解, 可知萤石存在至少三期成矿地质作用。依据M?ller的Tb/La-Tb/Ca成因判别图解, 结合常口萤石矿床的萤石及围岩的稀土元素特征, 认为火把山萤石成矿流体一方面与常口大型萤石矿床受同一成矿流体场控制, 并在有利的部位富集成矿; 另一方面, 成矿热液流体流经下峰岩组发生了淋滤、萃取、交换作用, 形成了不同地球化学特征的另一成矿期次的萤石。综合分析认为, 火把山萤石矿床为受断裂控制的大气降水成因的中低温热液充填矿床。 |
| 中文关键词:微量元素 稀土元素 矿床成因 萤石矿床 福建火把山 |
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| Geological Characteristics and Genesis of Huobashan Fluorite Deposit in Yupeng–Nankou Area, Fujian Province |
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| Abstract:This paper has comprehensively summarized the geological characteristics of Huobashan fluorite deposit in Yupeng–Nankou area, Fujian Province. It also discusses the genesis, metallogenic materials, and fluid sources of the deposit on the basis of the trace elements and rare earth elements found in fluorite. The results of the trace elements and rare earth elements found in fluorite ore reveal that fluorite has medium Eu negative anomaly and weak Ce anomaly. The REE distribution pattern has two curve types: a light rare earth enrichment type and gentle type with a weak deficit of light rare earth. According to the characteristics of the fluorite ore, the trace elements, the rare earth elements and the Y/Ho-La/Ho diagram, it can be concluded that there are at least three stages of mineralization in the fluorite. Based on the M?ller’s Tb/La-Tb/Ca genetic discrimination diagram, combined with the rare earth element characteristics of the fluorite and the surrounding rock of the Changkou fluorite deposit, it can be proposed that the Huobashan fluorite ore-forming fluid is controlled by the same ore-forming fluid field as the large Changkou fluorite deposit. It was also shown that it was enriched in a favorable position. On the other hand though, the ore-forming hydrothermal fluid flowed through the Xiafengyan Formation, leaching, extracting and causing metasomatism to take place. This formed another ore-forming fluorite with different geochemical characteristics. Comprehensive analysis shows that the Huobashan fluorite deposit in this study area is a fault zone filling deposit of middle-low temperature meteoric water from a hydrothermal origin. |
| keywords:trace elements rare earth elements deposit genesis fluorite deposit Huobashan, Fujian Province |
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