闽北羊角尾萤石矿成因:来自稀土、微量元素地球化学的证据
投稿时间:2021-12-06  修订日期:2022-01-24  点此下载全文
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金松 中化地质矿山总局地质研究院

河北地质大学地球科学学院
 
100101
王春连 中国地质科学院矿产资源研究所
自然资源部成矿作用与资源评价重点实验室 
高立湧 中化地质矿山总局地质研究院 
张成信 中化地质矿山总局地质研究院 
王占兵 中化地质矿山总局地质研究院 
王畅 中化地质矿山总局地质研究院 
孟都 中化地质矿山总局地质研究院 
商朋强 中化地质矿山总局 
中文摘要:闽北浦城羊角尾萤石矿产于侏罗系梨山组火山碎屑岩中的断裂破碎带内,对其地质矿产特征和矿石、围岩及矿区内黑云母正长花岗岩的岩石地球化学特征进行了研究。羊角尾萤石矿矿石∑REE为65.17×10-6~125.87×10-6,重稀土相对富集,δEu和Ce无明显异常;Ni、Cd、Pb和As等中低温微量元素相对地壳富集。围岩梨山组火山碎屑岩轻重稀土分馏不明显,Eu负异常明显,Sm/Nd值与萤石接近,微量元素相对地壳的含量曲线趋势与萤石基本一致。黑云母正长花岗岩则显示轻稀土富集、重稀土亏损,Eu正异常和Ce负异常的特征,Sm/Nd值远小于萤石矿。结合稀土微量元素特征及矿床成因判别图解,认为羊角尾萤石矿的主要成矿物质来源为梨山组火山碎屑岩。成矿流体在形成后经历了长期的演化,在此过程中与围岩发生了充分的水岩反映,使Ca、F、REE等重新活化,最终在构造破碎带就位沉淀形成矿体,矿床成因类型为中-低温热液充填型。羊角尾萤石矿的矿床成因研究表明晚侏罗世火山-沉积岩系是区域萤石矿成矿的重要物源基础,在区域找矿工作中应重点关注。
中文关键词:萤石矿  稀土元素  地球化学  成矿作用  羊角尾
 
Evidence from REE and micronutrient geochemistry for genesis of Yangjiaowei fluorite deposit in northern Fujian
Abstract:The Yangjiaowei fluorite deposit occurs in the fracture zone of Jurassic Lishan formation pyroclastic rocks in Pucheng,northern Fujian. In this paper, the geological and mineral characteristics and the rock geochemistry characteristics of the ores, wall rocks and biotite granites in the mining area are studied. The ∑REE of fluorite ore is 65.17×10-6~125.87×10-6, the HREE is relatively enriched, the δEu and δCe are not obviously abnormal, and the Ni, Cd, Pb and As are relatively enriched in the crust in the micronutrient. The fractionation of LREE and HREE in the pyroclastic rocks of the Lishan Formation in the wall rock is not obvious, the negative anomaly of Eu is obvious, the Sm/Nd ratio is close to that of fluorite, and the curve of the content of micronutrient in the crust is basically consistent with that of fluorite.The biotite granite shows LREE enrichment, HREE depletion, Eu positive anomaly and Ce negative anomaly, and the Sm/Nd ratio is much less than that of fluorite. According to the characteristics of REE and micronutrient ,and the diagrammatic interpretation of the Genesis of the deposit, it is considered that the main source of ore-forming materials of Yangjiaowei fluorite ore is the Lishan formation pyroclastic rock, which is not obviously related to the late Jurassic syenite granite. The ore-forming fluid underwent a long-term evolution after its formation, during which it was fully reflected by water and rock with the surrounding rock, and the Ca, F and REE were reactivated, and finally the ore bodies were deposited in the structural fracture zone, therefore, Yangjiaowei fluorite deposit is a mesothermal-epithermal filling deposit. The study on the ore-forming material source of Yangjiao fluorite deposit indicates that the late Jurassic volcanic-sedimentary rock series is the important material source of the regional fluorite mineralization and worth paying attention to mineral exploration.
keywords:Fluorite deposit  REE  Geochemistry  Mineralization  Yangjiaowei
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