河南灵宝市小秦岭金矿田流体包裹体特征及地质意义  

Characteristics and geological significance of fluid inclusionsin Xiaoqinling gold ore field,Lingbao City,Henan

作　　者：杨生强 张苏坤 王鹏飞 王辉 黄昊 薛志强 丁毅 陈柯颖 王红军 孙保花 YANG Shengqiang;ZHANG Sukun;WANG Pengfei;WANG Hui;HUANG Hao;XUE Zhiqiang;DING Yi;CHEN Keying;WANG Hongjun;SUN Baohua(The First Geological Survey Institute of Mineral Resources,Bureau of Geology and Mineral Exploration and Development of Henan Province,Luoyang 471023,Henan,China;Key Laboratory of Precious Metal Analysis and Exploration Technology of Ministry of Natural Resources,Luoyang 471023,Henan,China;Key Laboratory of Gold and Silver Polymetallic Ore-forming Series and Deep Prediction of Henan,Luoyang 471023,Henan,China)

机构地区：[1]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023 [2]自然资源部贵金属分析与勘查技术重点实验室,河南洛阳471023 [3]河南省金银多金属成矿系列与深部预测重点实验室,河南洛阳471023

出　　处：《矿产与地质》2022年第1期111-119,128,共10页Mineral Resources and Geology

基　　金：灵宝市政府和河南省地矿局战略合作的项目“河南省灵宝市小秦岭金矿田成矿规律及深部找矿预测研究项目”(编号:122)资助。

摘　　要：小秦岭金矿田河南段累计查明金数百吨,先后建成文峪、秦岭、大湖等大中型国有矿山数十座,但浅部资源枯竭、深部找矿效果不佳。通过对小秦岭金矿田流体包裹体系统研究,发现小秦岭金矿田南中矿带流体包裹体类型可划分为C型、V型、V+L型、S型和L型5种,而北矿带与之存在一定差异,基本不发育S型包裹体;矿田内众多矿床流体系统上关系密切,总体表现为以中温为主的中高温热液矿床,且至少存在4个成矿阶段,流体性质为中-低盐度流体,且北矿带包裹体盐度和温度跨度较南矿带更高;成矿流体中阳、阴离子含量随矿脉矿化类型的变化由多金属型→黄铜矿-黄铁矿型→黄铁矿(少硫化物型)变化时,K^(+)、Cl^(-)离子含量有逐渐增高趋势,SO^(2-)_(4)离子含量有逐渐减少趋势,显示出多期多阶段成矿过程中流体成分的变化。CO_(2)/H_(2)O、Na^(+)/K^(+)、Cl^(-)/SO^(2-)_(4)比值的空间变化特征,对金矿的评价具有一定的借鉴意义。More than several hundred tones of gold mineral resources have been found in the Xiaoqinling gold ore field(Henan section),and dozens of large and medium-sized state-owned mines have been built successively,such as Wenyu,Qinling,Dahu mine.But the shallow mineral resources are exhausted and the prospecting effect is poor in the deep area.Through the study of fluid inclusion system in Xiaoqinling gold ore field,it is found that the fluid inclusion types in the central and south ore belts of Xiaoqinling gold ore field can be divided into five types,C-type,V-type,V+L-type,S-type and L-type.The fluid system of many deposits in the ore field is closely related to each other,and the overall performance is the medium high temperature hydrothermal deposits dominated by medium temperature,and there are at least four mineralization stages.The fluid feature is shown as medium low salinity,and the salinity and temperature range of inclusions in the north ore belt is higher than those in the south ore belt.With the change of mineralization type of ore vein,the contents of cation and anion in ore-forming fluid change from polymetallic type to chalcopyrite pyrite type,to pyrite(less sulfide)type,the contents of K+and Cl-ions gradually increase,and the content of SO^(2-)_(4) ion gradually decreases,indicating the variation of fluid composition in multi-stage mineralization process.The spatial variation characteristics of CO_(2)/H_(2)O,Na^(+)/K^(+),Cl^(-)/SO^(2-)_(4)ratios have the certain significance for the gold deposit evaluation.

关 键 词：金矿 流体包裹体特征 地质意义 小秦岭矿田 河南 

分 类 号：P618.51[天文地球—矿床学]