河南嵩县车村萤石矿床稀土元素特征及地质意义  

REE Geological Characteristics of Checun Fluorite Deposit in Song County,Henan Province

作　　者：董文超[1] 庞绪成[1] 司媛媛 梁贞[2] 李文明 Dong Wenchao;Pang Xucheng;Si Yuanyuan;Liang Zhen;Li Wenming(Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China;No.2 Institute of Geological,Mineral Resources Survey of Henan,Zhengzhou 450000,China)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450000

出　　处：《中国稀土学报》2020年第5期706-714,I0004,共10页Journal of the Chinese Society of Rare Earths

基　　金：中国地质调查局科研项目(12120114035401);河南省“探矿权、采矿权”项目(2015-05)资助。

摘　　要：为了探讨稀土元素地球化学特征对车村萤石矿的成矿物质来源及成矿流体特征的指示意义,通过对萤石样品稀土元素组合进行测试。研究发现,车村地区萤石矿的稀土元素地球化学研究发现萤石单矿物的稀土元素配分模式较为复杂。萤石单矿物总体具有较高的稀土元素总量,∑REE=47.3×10^-6~119.1×10^-6,δEu=0.35~0.88,呈中等负铕异常,δCe=0.90~1.37,铈弱正异常。合峪花岗岩的稀土元素配分模式曲线略微右倾,稀土元素总量较高,∑REE=17.1×10^-6~239.2×10^-6,δEu=0.32~1.95,正、负Eu异常同时存在,δCe=0.96~2.19,正Ce异常为主。萤石单矿物的Eu, Ce异常暗示车村萤石矿在形成过程中处于一个中低温、还原的成矿体系,萤石的形成经历了从相对高温向低温的演化过程。萤石Y/Ho比为12.98~42.20,呈明显的迁移分带特征,表明矿床形成过程中有大量的外源物质加入和成分交换,成矿流体对围岩发生了Ca的同化混染作用。结合成矿年代学,基本确定车村萤石矿与合峪花岗岩晚期的岩浆热液有关,矿床类型为中浅成中低温岩浆期后热液萤石矿床。This article tested the combination of rare earth elements on fluorite samples,in order to explore the indication of the geochemical characteristics of rare earth elements on the source of ore-forming materials and the characteristics of ore-forming fluids in the Checun fluorite mine. It is found that the rare earth element distribution patterns of fluorite single minerals are divided into two categories, through the REE geochemical study of fluorite ore in Checun area. The first type of fluorite single mineral has a rare earth element distribution pattern similar to that of Heyu granite;The rare earth element distribution pattern of the stone single mineral is relatively flat, with obvious characteristics of the rare earth source distribution pattern. The fluorite mineral has a high total amount of rare earth elements, ∑REE=47.3×10^-6~119.1×10^-6, δEu=0.35~0.88, which is moderately negative, δCe=0.90~1.37, weak abnormal. The REE pattern of Heyu granite is slightly right-dip, and the total amount of rare earth elements is higher. ∑REE=17.1×10^-6~239.2×10^-6, δEu=0.32~1.95, positive and negative anomalies exist simultaneously, δCe=0.96~2.19, the positive anomaly is dominant. The Eu and Ce anomalies of fluorite minerals suggest that the Checun fluorite ore is in a medium-low temperature and reduced ore-forming system during the formation process. The formation of fluorite has undergone a process from relative high temperature to low temperature. The fluorite Y/Ho ratio is 12.98~42.20, which shows obvious migration and zoning characteristics. It indicates that there is a large amount of exogenous substance addition and component exchange during the formation of the deposit. The ore-forming fluid has Ca assimilation and mixing effect on the surrounding rock. It is basically determined that the porphyrite deposit in the Checun is related to the magmatic hydrothermal fluid in the late stage of the Heyu granite,combined with the chronology of mineralization. The deposit type is the hydrothermal fluorite depo

关 键 词：稀土元素地球化学 萤石 合峪花岗岩 车村 河南 

分 类 号：P618.52[天文地球—矿床学] P595[天文地球—地质学]