河北张宣地区中山沟金矿成矿流体特征及其对侵入岩型碲金矿床的限定  

Characteristics of ore-forming fluids of the Zhongshangou gold deposit,Zhangjiakou-Xuanhua area,Hebei Province:Limitation on the intrusive rock related telluride-gold deposits

作　　者：甄世民[1,2,3] 查钟健 王大钊 刘家军 庞振山[1,2] 程志中[1,2] 薛建玲 王江[3] 白海军 李阳[6] 陈超 ZHEN Shimin;ZHA Zhongjian;WANG Dazhao;LIU Jiajun;PANG Zhenshan;CHENG Zhizhong;XUE Jianling;WANG Jiang;BAI Haijun;LI Yang;CHEN Chao(Development and Research Center of China Geological Survey,Beijing 100037,China;Technical Guidance Center for Mineral Resources Exploration,Ministry of Natural Resources,Beijing 100120,China;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;State Key Laboratory of Nuclear Resource and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China;Third Geological Brigade of Hebei Geological and Mineral Bureau,Zhangjiakou,075000,Hebei,China;College of Resources,Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]自然资源部矿产勘查技术指导中心,北京100120 [3]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [4]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [5]河北省地矿局第三地质大队,河北张家口075000 [6]河北地质大学资源学院,河北石家庄050031

出　　处：《中国地质》2023年第2期605-621,共17页Geology in China

基　　金：中国地质调查局项目(DD20160052,DD20190570,DD20190159,DD20190166);河北省自然科学基金项目(D2019403015,ZD2019003)联合资助。

摘　　要：【研究目的】中山沟金矿位于华北克拉通北缘、尚义—崇礼—赤城深大断裂的南侧,是河北省张宣金矿集区典型金矿床之一。本文探讨了矿床成矿流体特征和演化,以期为该矿床找矿勘查提供理论依据。【研究方法】本文总结了中山沟金矿的成矿背景、矿区地质特征、矿体及矿石特征,选取4个阶段的代表性样品,开展了流体包裹体岩相学和显微测温、氢氧同位素、氦氩同位素等研究。【研究结果】研究发现中山沟金矿可划分为4个成矿阶段:钾长石-黄铁矿-石英阶段(Ⅰ)、乳白色石英-黄铁矿阶段(Ⅱ)、烟灰色石英-硫化物阶段(Ⅲ)和贫硫化物-碳酸盐阶段(Ⅳ)。各成矿阶段主要发育气液两相原生流体包裹体。流体包裹体测温数据表明,其主成矿阶段均一温度为210~250℃、盐度为6.01%~13.62%NaCleqv。氢、氧同位素研究表明,δ^(18)O水和δDV-SMOW值分别为-2.97‰~6.96‰和-94.6‰~-80.2‰,具有明显向大气降水线发生漂移而呈线性变化的特征。黄铁矿氦、氩同位素研究表明,^(3)He/^(4)He值为1.82×10^(-7)~9.24×10^(-7),^(40)Ar/^(36)Ar值为699.9~2200.4,R/Ra值为0.13~0.66,放射成因^(40)Ar^(*)为55.89%~86.57%,幔源He为2.00%~10.86%。【结论】中山沟金矿成矿流体经历了从中高温、中低盐度至低温、中低盐度的持续演化过程。其主成矿阶段发生了强烈的沸腾作用,成矿晚期有大量的大气降水的混入。随着成矿作用的进行,幔源物质参与成矿的比例逐渐升高。成矿流体具有壳幔混合的特点。综上所述,中山沟金矿的成矿流体具有侵入岩型碲金矿床的特点。This paper is the result of mineral exploration engineering.[Objective]The Zhongshangou gold deposit is located in the north margin of North China Craton and the south side of Shangyi−Chongli−Chicheng deep fault.It is one of the typical gold deposits in Zhangjiakou-Xuanhua gold concentration area,Hebei Province.This paper discusses the characteristics and evolution of ore-forming fluids,in order to provide a theoretical basis for the exploration of the deposit.[Methods]This paper summarizes the regional mineralizing setting,geological characteristics of the mining area,ore body and ore characteristics.Representative samples from four metallogenic stages were selected to conduct research on fluid inclusion petrography and micro thermometry,hydrogen and oxygen isotopes,and helium and argon isotopes.[Results]The results indicate that it can be divided into four metallogenic stages:K−feldspar−pyrite−quartz stage(I),milky white quartz−pyrite stage(II),smoky gray quartz−sulfide stage(III)and sulfide−poor−carbonate stage(IV).Gas−liquid two-phase primary fluid inclusions are mainly developed in each mineralization stage.The temperature measurement data of fluid inclusions show that the homogenization temperature and salinity of main ore-forming stage are respectively 210-250℃and 6.01%-13.62%NaCleqv.Hydrogen and oxygen isotope show thatδ^(18)OH_(2)O andδDV-SMOW values are respectively-2.97‰-6.96‰and-94.6‰--80.2‰,which show that theδ^(18)OH_(2)O values drift to the atmospheric water line and show a linear change.Helium and argon isotope of the pyrite show that ^(3)He/^(4)He values are 1.82×10^(-7)-9.24×10^(-7),^(40)Ar/^(36)Ar values are 699.9-2200.4,R/Ra values are 0.13-0.66,radiogenic ^(40)Ar^(*)values are 55.89%-86.57%,and mantle derived helium values are 2.00%-10.86%.[Conclusions]The ore-forming fluid has experienced a continuous evolution process from medium−high temperature and medium−low salinity to low temperature and medium−low salinity.The main ore-forming stage experienced

关 键 词：金矿 成矿流体 流体包裹体 同位素 地质调查工程 中山沟 张宣地区 河北 

分 类 号：P618.51[天文地球—矿床学]