桂东北黄关萤石矿床稀土元素和氢氧同位素特征  

Characteristics of the REE and H‑O isotopes in Huangguan fluorite deposit at the Northeast Guangxi,southern China

作　　者：黄振男 方贵聪 李根[1] 杨蕊嘉 王绪涛 Huang Zhennan;Fang Guicong;Li Gen;Yang Ruijia;Wang Xutao(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,College of Earth Science,Guilin University of Technology,Guilin,Guangxi 541004;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources By the Province and Ministry,Guilin University of Technology,Guilin,Guangxi 541004)

机构地区：[1]桂林理工大学地球科学学院,广西隐伏金属矿产勘查重点实验室,广西桂林541004 [2]有色金属矿产勘查与资源高效利用省部共建协同创新中心,桂林理工大学,广西桂林541004

出　　处：《地质科学》2023年第3期910-923,共14页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点研发计划项目(编号:2021YFC2900100);广西自然科学基金项目(编号:2022GXNSFFA035025,2020GXNSFAA159154)资助。

摘　　要：桂东北地区热液脉状萤石矿床数量众多,但萤石矿床的成矿流体性质和矿质来源不甚清楚。本文以黄关萤石矿床作为研究对象,在详细野外地质调查的基础上开展了萤石稀土元素测试及氢氧同位素研究,并与都庞岭花岗岩的全岩稀土元素特征进行对比。结果显示:萤石ΣREE=38.08×10^(-6)~83.23×10^(-6),花岗岩围岩ΣREE=122.02×10^(6)~199.56×10^(-6),围岩花岗岩与萤石的稀土元素配分曲线均呈右倾型,具有同步性,表明矿物形成与围岩花岗岩关系密切;Eu无明显异常,Ce弱负异常或异常不明显,指示萤石在相对氧化的环境下形成;氢氧同位素测试结果显示,δDV-SMOW介于-50.4‰~-34.7‰,δ^(18)OV-SMOW介于-9.8‰~-5.5‰,认为成矿流体以大气降水为主。矿床成矿物质F来自于都庞岭花岗岩体,Ca主要来自地层,部分来自岩体。There are numerous hydrothermal vein fluorite deposits in northeast of Guangxi Province,but the nature of mineralizing fluids and the source of mineralogy in fluorite deposits are not well understood.In this paper,fluorite rare earth element tests and hydrogen‑oxygen isotope studies of fluorite were carried out on the basis of detailed field geological investigations using the Huangguan fluorite deposit as the research object,and compared with the whole‑rock rare earth element characteristics of the Dupangling granite.The results show the fluorite ΣREE=38.08×10^(‑6)~83.23×10^(‑6),the granite surrounding rockΣREE=122.02×10^(‑6)~199.56×10^(‑6),the partition curve of rare earth elements between granite and fluorite are both right‑dipping and synchronous,indicating that the mineral formation is closely related to the surrounding rock granite.There is no obvious anomaly in Eu and Ce shows weak negative anomaly or no obvious anomaly,which indicates that fluorite is formed in a relatively oxidized environment.The research results of hydrogen and oxygen isotopes show that δDV‑SMOW-50.4‰~-34.7‰,δ^(18)OV‑SMOW-9.8‰~-5.5‰,suggesting that the ore‑forming fluid is mainly atmospheric precipitation.The ore‑forming materials F comes from the Dupangling granitic pluton and the Ca mainly comes from the stratum,partly from the granite pluton.

关 键 词：桂东北 黄关萤石矿床 稀土元素 氢氧同位素 成矿流体 

分 类 号：P618[天文地球—矿床学] P619[天文地球—地质学]