中国萤石矿床锶同位素、氢氧同位素地球化学特征  

Geochemical characteristics of strontium and hydrogen and oxygen isotopes in fluorite deposits in China

作　　者：朱敬宾 王吉平[1] 商朋强 石秋圆 Zhu Jingbin;Wang Jiping;Shang Pengqiang;Shi Qiuyuan(Geological Institute of China Chemical Geology and Mine Bureau,Beijing,100101,China;China Chemical Geology and Mine Bureau,Beijing,100013,China)

机构地区：[1]中化地质矿山总局地质研究院,河北涿州072754 [2]中化地质矿山总局,北京100013

出　　处：《化工矿产地质》2021年第1期7-16,共10页Geology of Chemical Minerals

基　　金：中国地质调查局“中国矿产地质与区域成矿规律综合研究”(中国矿产地质志)项目(1212011220369);“江西赣南-福建浦城地区战略性萤石硼资源调查”(DD20190816);“东部地区硼磷萤石等重要非金属矿产调查”(DD20160057)。

摘　　要：通过对前人所做典型萤石矿床和区域萤石矿床锶、氢氧同位素地球化学资料的综合研究,从锶、氢氧同位素地球化学特征角度分析了中国萤石矿床的物质来源和萤石矿形成时成矿流体的性质及来源。由锶同位素地球化学资料综合分析得出:以灰岩为主要围岩的沉积改造型及部分热液充填型萤石矿床成矿物质主要来源于其围岩灰岩;以火山岩、火山碎屑岩为主要围岩的热液充填型萤石矿床其成矿物质主要来自于围岩火山岩、火山碎屑岩;以花岗岩为主要围岩的热液充填型萤石矿其成矿物质来源于围岩花岗岩。由氢氧同位素地球化学资料综合分析得出:以灰岩、花岗岩为主要围岩的沉积改造型萤石矿床其成矿流体既有岩浆水和大气降水的混合液,也有大气降水,所有萤石矿床中的巨晶萤石的氢氧同位素组成都落在大气降水线附近,其成矿流体以大气降水为主。Based on a comprehensive study on strontium and hydrogen and oxygeon isotope geochemical data of typical and regional fluorite deposits,the material sources of fluorite deposits in China and the properties and sources of ore-forming fluids during the formation of fluorite deposits are analyzed from the geochemical characters of Sr,H and O isotopes.Based on the comprehensive analysis of Sr isotope geochemical data,it is concluded that ore-forming materials of sedimentary alteration type of limestone as main wall rocks and some of the hydrothermal filled fluorite deposits mainly come from the limestone as wall rock,the ore-forming materials of hydrothermal filled fluorite deposits with volcanic rock and pyroclastic rock as main wall rocks mainly come from volcanic rocks and pyroclastic rocks,the ore-forming materials of hydrothermal-filled fluorite deposits with granite as the main wall rock come from granite.According to the comprehensive analysis of H and O isotope geochemical data,the ore-forming fluid of sedimentary reformed fluorite deposits with limestone and granite as the main wall rocks includes both the meteoric water and the mixture of magmatic water and meteoric water.The hydrogen and oxygen isotopic compositions of giant crystal fluorite in all fluorite deposits are near the meteoric water line ofδD-δ18 O scatter diagram,and the ore-forming fluid is mainly meteoric water.

关 键 词：中国萤石矿床 锶同位素 氢氧同位素 物质来源 成矿流体性质 

分 类 号：P619.215[天文地球—矿床学] P59[天文地球—地质学]