华南造山带北东端萤石矿床地球化学特征  

Geochemical characteristics of the fluorite deposits in Northeastern end of the South China orogenic belt

作　　者：钱建民 华杰雄 Qian Jianmin;Hua Jiexiong(Institute of Geophysical and Geochemical Exploration of Zhejiang Province,Hangzhou,Zhejiang,310005,China;Suichang gold mine Co.Ltd of Zhejiang,Lishui,Zhejiang,323304,China)

机构地区：[1]浙江省地球物理地球化学勘查院,浙江杭州311115 [2]浙江省遂昌金矿有限公司,浙江丽水323304

出　　处：《化工矿产地质》2022年第3期193-200,共8页Geology of Chemical Minerals

基　　金：浙江省地勘资金浙江省萤石矿产资源调查(项目编号:2012001)。

摘　　要：为了探讨华南造山带北东端萤石矿床的成矿机理、成矿物质来源,以30个大、中型萤石矿床为基础,对地质背景、微量和稀土元素地球化学特征进行了研究。不同矿床萤石矿石的微量元素配分型式基本一致,亏损K、P、Ti,富集Li、Sb;萤石矿石∑REE为18.4×10^(-6)~185.5×10^(-6),平均87.5×10^(-6);∑LREE/∑HREE为0.3~3.9,平均0.9;(La/Yb)_(N)为1.0~14.9,平均6.1;(La/Sm)_(N)为1.4~5.6,平均2.5;δEu为0.3~1.16,平均0.9;δCe为0.71~1.12,平均0.9;稀土元素配分模式曲线有平缓型、缓右倾型、明显Eu负异常的“飞雁型”、右倾型4种分布模式。研究区为中低温构造热液成因—断裂带充填成矿,成矿环境主要为弱氧化还原条件,部分为还原条件,成矿物质Ca、F物质源区相似,主要来自片麻岩为主的变质基底。In order to probe the metallogenic mechanism,ore source and evolution of the fluorite deposit in the Northeastern end of the South China orogenic belt.The geological background,trace,and geochemical characteristics of rare earth elements were studied based on the 30 large and medium-sized fluorite deposits.The trace element distribution pattern of fluorite ore in different deposits is basically identical.Li,Sb are enriched and K,P,Ti are depleted.∑REE of fluorite ores:18.4×10^(-6)~185.5×10^(-6),average is 87.5×10^(-6);∑LREE/∑HREE is 0.3~3.9,average is 0.9;(La/Yb)_(N) is 1.0~14.9,average is 6.1;(La/Sm)_(N) is 1.4~5.6,average is 2.5;δEu varies at 0.3~1.16,average is 0.9;δCe varies at 0.71~1.12,average is 0.9.REE distribution pattern of fluorite ores are shown as“Gentle type”,“Gently rightward”,“Flying Geese”,“Rightward type”.The medium and low temperature hydrothermal fluid is filled into the fracture zone to form a fluorite ore in this district.The minerlogenic environment is mainly weak redox condition and partly reducing conditions.The source areas of minerals Ca and F are similar,mainly from metamorphic basement made of gneiss.

关 键 词：华南造山带北东端 萤石矿 地球化学特征 

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