Geochemical Characteristics of Trace Elements and REE in Zhangcuo Fluorite Deposit in Shaowu Area, Fujian Province
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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。Abstract: 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.
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Key words:
- fluorite ore /
- trace and rare earth elements /
- geochemical /
- material source /
- Zhangcuo, Shaowu
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