江西银坑矿田钨钼与铅锌银成因关系研究:来自流体包裹体和同位素的证据  

Study on genetic relationship between tungsten-molybdenum and lead-zinc-sil⁃ver in Yinkeng ore field,Jiangxi Province:Evidence from fluid inclusions and isotopes

作　　者：李晓夏 赵正[1] 陈振宇[1] LI XiaoXia;ZHAO Zheng;CHEN ZhenYu(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《矿床地质》2025年第1期183-202,共20页Mineral Deposits

基　　金：国家自然科学基金地质联合基金重点项目(编号:U2344207);中国地质调查局地质调查项目(编号:DD20242254);自然资源部新一轮找矿突破战略行动科技支撑项目(编号:ZKKJ202424);中央级公益性科研院所基本科研项目联合资助。

摘　　要：银坑矿田位于南岭成矿带东段赣南地区,矿田内发育石英脉-云英岩型钨钼矿化和热液脉型铅锌银多金属矿化,两者空间上紧密共生,且成岩成矿时间上基本一致(160~150Ma),是研究岩浆热液型钨钼与铅锌银多金属共生成矿机制的理想地区。文章在矿床地质工作的基础上,重点对银坑矿田钨钼矿和铅锌银矿的成矿流体来源、流体包裹体矿相学、流体包裹体的温度-压力-密度条件进行了系统对比分析。银坑钨钼(张家地)成矿主要经历了早期黑钨矿-长石-石英阶段、辉钼矿-黄铁矿阶段、晚期硫化物-碳酸盐阶段,发育富含气液两相包裹体和含CO_(2)的三相水溶液包裹体,成矿流体主要来自岩浆水,后期有少量大气降水参与,总体为中低温、中低盐度、中等密度和中低压的CO_(2)-NaCl-H_(2)O流体体系。银坑铅锌银(牛形坝)成矿主要经历了早期石英-黄铁矿阶段、石英-多金属硫化物阶段、晚期硫化物-碳酸盐阶段,发育气液两相包裹体和纯气相包裹体以及少量含CO_(2)的三相水溶液包裹体,成矿流体主要来自岩浆水,后期有变质水和大气水的参与,总体为中低温、中低盐度、中等密度和中高压的NaCl-H_(2)O流体体系。综合分析显示,钨钼在中低温和中低压的条件下沉淀,铅锌银在中低温和中高压的条件下沉淀,银坑矿田钨钼和铅锌银成矿流体具有一定继承演化关系,推断为与花岗质侵入岩相关的同一成矿系统产物,以此提出了银坑矿田深部找矿方向,为南岭东段矿产勘查提供了新的理论基础。The Yinkeng ore field is located in the eastern part of the Nanling metallogenic belt in southern Jiangxi.The quartz vein-greisen type tungsten-molybdenum mineralization and hydrothermal vein type lead-zinc-silver polymetallic mineralization are developed in the ore field.They are closely associated with the intrusion emplacement,in space and the time and mineralization is basically the same(160~150 Ma).It is an ideal area for studying the co-generation mechanism of magmatic hydrothermal tungsten-molybdenum and lead-zinc-silver polymetallic.Based on the geological work of the ore deposits,this paper focuses on the systematic comparative analysis of the source of ore-forming fluids,the mineragraphy of fluid inclusions,and the temperature-pressure-density conditions of fluid inclusions in the tungsten-molybdenum ore and lead-zinc-silver ore in the Yinkeng ore field.The tungsten-molybdenum mineralization in Yinkeng(Zhangjiadi)mainly experienced the early wolframite-feldsparquartz stage,molybdenite-pyrite stage,and late sulfide-carbonate stage,and developed gas-liquid two-phase inclusions and CO_(2)-containing three-phase aqueous inclusions.The ore-forming fluid mainly comes from magmatic water,and a small amount of atmospheric is involved in the later stage.Overall it is a CO_(2)-NaCl-H_(2)O fluid system with medium-low temperature,medium-low salinity,medium density and medium-low pressure.The lead-zincsilver mineralization in Yinkeng(Niuxingba)mainly experienced the early quartz-pyrite stage,quartz-polymetallic sulfide stage,and late sulfide-carbonate stage.Gas-liquid two-phase inclusions and pure gas-phase inclusions and a small amount of CO_(2)-containing three-phase aqueous inclusions were developed.The ore-forming fluid mainly comes from magmatic water,and the later stage has the participation of metamorphic water and atmospheric water.Overall it is a NaCl-H_(2)O fluid system with medium-low temperature,medium-low salinity,medium density and medium-high pressure.Comprehensive analysis shows that tungsten and mo

关 键 词：成矿流体 钨钼矿床 铅锌银多金属矿床 找矿预测 银坑矿田 

分 类 号：P618.42[天文地球—矿床学]