福建邵武地区张厝萤石矿微量、稀土元素地球化学特征  

Geochemical Characteristics of Trace Elements and REE in Zhangcuo Fluorite Deposit in Shaowu Area,Fujian Province

作　　者：周博文 王春连[2] 游超 刘殿鹤 刘思晗 余小灿 颜开 刘雪 刘延亭 ZHOU Bo-wen;WANG Chun-lian;YOU Chao;LIU Dian-he;LIU Si-han;YU Xiao-can;YAN Kai;LIU Xue;LIU Yan-ting(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan,Hubei 430074;School of Earth and Space Sciences,Peking University,Beijing 100871;Faculty of Earth Science,University of Iceland,Reykjavík,Iceland 101;School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]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,北京100037 [3]中国地质大学(武汉)地质调查研究院,湖北武汉430074 [4]北京大学地球与空间科学学院,北京100871 [5]冰岛大学地球科学学院,冰岛雷克雅未克101 [6]东华理工大学地球科学学院,江西南昌330013

出　　处：《地球学报》2022年第3期393-403,共11页Acta Geoscientica Sinica

基　　金：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:DD20221684,DD20190816,DD20190606)联合资助。

摘　　要：张厝萤石矿是福建邵武地区典型萤石矿床之一,萤石矿体赋存于晚侏罗世似斑(少斑)中细粒(细粒)正长花岗岩的断裂构造中,矿体产状严格受断裂控制。本文对萤石矿石及围岩的微量元素及稀土元素进行了系统分析。微量元素分析结果显示:亏损高场强元素Nb、Zr及大离子亲石元素Sr、Ba,富集高场强元素U、Hf、Ti和大离子亲石元素Rb。萤石和围岩稀土配分曲线具有相似同步性,因此认为研究区萤石的成矿物质来源是相同的,物源具有相似性。萤石矿稀土元素分布模式为右倾的轻稀土富集型,Eu处出现一个明显“V”形,表现为负Eu异常、Ce弱正异常,表明其形成于还原环境中。通过Tb/Ca-Tb/La关系图分析,说明该萤石矿为热液充填型萤石矿床。综合分析,认为该萤石矿的成矿物质F和Ca主要来源于热液对围岩的淋滤和萃取,成矿热液主要来源于大气降水。Zhangcuo fluorite deposit is one of the typical fluorite deposits in Shaowu area,Fujian Province.The fluorite ore body occurs in the fault structure of Late Jurassic porphyry(little porphyry)medium-fine grain(fine grain)syenogranite,and the occurrence of the ore body is strictly controlled by the fault.In this study,trace elements and rare earth elements(REE)in fluorite ore and surrounding rock were systematically analyzed.The results of trace element analysis showed that the depletion of high field strength elements Nb and Zr and large ion lithophile elements Sr and Ba,and enrichment of high field strength elements U,Hf,Ti and large ion lithophile elements Rb.The REE distribution curves of fluorite and surrounding rock have similar synchronization,therefore it is considered that the sources of ore-forming materials of fluorite in the study area are the same and the provenance is similar.The results revealed that the REE distribution pattern of fluorite ore is a right-leaning LREE enrichment type,with an evident“V”shape in Eu,negative Eu anomaly and weak Positive Ce anomaly,indicating that the ore was formed in a reductive environment.The Tb/Ca-Tb/La diagram shows that the fluorite deposit is hydrothermal filled type.Comprehensive analysis shows that F and Ca are mainly derived from leaching and extraction of surrounding rock by hydrothermal solution,and the ore-forming hydrothermal solution is primarily derived from meteoric water.

关 键 词：萤石矿 微量和稀土元素 地球化学 物质来源 邵武张厝 

分 类 号：P619.215[天文地球—矿床学] P595[天文地球—地质学]