赣南楂山里超大型萤石矿床成矿流体特征研究  

Ore-forming Fluids Characteristics of the Zhashanli Ultra Large Fluorite Deposit in Southern Jiangxi Province.

作　　者：廖志权 陈斌锋 陈伟 贺根文 LIAO Zhi-Quan;CHEN Bin-Feng;CHEN Wei;HE Gen-Wen(School of Earth Sciences,East China University of Technology,Nanchang 330013,Jiangxi,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China;The Seventh Geological Brigade of Jiangxi Bureau of Geology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [3]江西省地质局第七地质大队,江西赣州341000

出　　处：《华南地质》2025年第1期63-74,共12页South China Geology

基　　金：江西省赣州市科技局科技计划专项(2022B-GY9938);江西省地质局青年科学技术带头人培养项目(2024JXDZKJRC01)。

摘　　要：楂山里超大型萤石矿床位于武夷山成矿带中部,是近年来在赣南新发现的矿床,矿体严格受南华系变质基底与白垩系红层盆地接触地带发育的北北东向的F1断裂构造带控制。本文划分了萤石成矿阶段,开展了详细的萤石流体包裹体岩相学、均一温度、激光拉曼光谱成分研究,讨论了该矿床成矿流体的性质、来源、演化,对矿床成因进行了初步探讨。研究表明,萤石流体包裹体具有相似的特征,均发育纯气相、气液两相、纯液相3种类型的原生包裹体,其中以富液两相包裹体为主,均一温度变化在123~409℃之间,平均224℃,盐度变化于0.02~2.38%NaCleq之间,平均0.42%NaCleq,密度变化于0.43~0.95 g/cm^(3)之间,平均0.82 g/cm^(3)。由早阶段至主阶段,均一温度有由高至低的趋势,密度略有增高趋势,包裹体成分以H_(2)O为主。总体而言,成矿流体属于中低温、低盐度、低密度的NaCl-H_(2)O体系,成矿流体有大气降水加入,萤石沉淀机制为流体冷却、古地热水与大气降水流体混合。楂山里萤石矿属浅成中低温热液充填型萤石矿床。The recently discovered Zhashanli ultra-large fluorite deposit in the southern Jiangxi is located in the central part of the Wuyi Mountains metallogenic belt.The ore body occurs along and is strictly controlled by the F1 fault structure,which strikes NNE and is situated at the boundary between the metamorphic basement of the Nanhuan Group and the Cretaceous red-bed basin.This paper divides the fluorite metallogenic stages and conducts detailed studies on the petrography of fluid inclusions,homogenization temperatures,and the composition of laser Raman spectra of fluorite.It discusses the properties,sources,and evolution of the metallogenic fluids and provides a preliminary exploration of the genesis of the deposit.The study shows that the fluorite fluid inclusions exhibit similar characteristics,developing pure gas-phase,gasliquid two-phase,and pure liquid-phase inclusions.The predominant type of fluid inclusion is the liquid-rich two-phase inclusion.The homogenization temperature ranges from 123℃to 409℃,with an average of 224℃.The salinity varies from 0.02%Nacleq to 2.38%NaCleq,with an average of 0.42%NaCleq.The density ranges from 0.43 g/cm^(3) to 0.95 g/cm^(3),with an average of 0.82 g/cm^(3).From the early stage to the main stage,the homogenization temperature shows a decreasing trend,while the density slightly increases.The composition of the inclusions is primarily H_(2)O.Overall,the metallogenic fluids belong to a low-to-moderate temperature,low-salinity,and low-density NaCl-H_(2)O system.Atmospheric precipitation is involved in the metallogenic fluids,and the fluorite precipitation mechanism is primarily fluid cooling,with mixing of ancient geothermal water and atmospheric precipitation.The Zhashanli fluorite deposit is an epithermal medium-tolow temperature hydrothermal filling-type fluorite deposit.

关 键 词：楂山里超大型萤石矿床 流体包裹体 浅成中低温热液矿床 充填型矿床 赣南 

分 类 号：P619.215[天文地球—矿床学]