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吉林省敦化市松江河金矿床流体包裹体特征及其成矿物理化学条件
- 秦臻|孙德有|张继林|李临位|汪振甬|李绪俊
- 作者单位：
- 吉林大学地球科学学院|吉林大学地球科学学院&国土资源部东北亚矿产资源评价重点实验室|中国黄金集团资源有限公司|中国黄金集团资源有限公司|中国黄金集团资源有限公司|吉林大学地球科学学院
基金项目：
- 中国黄金集团公司科研项目（WKY201605）
详细信息：
- 作者简介：
- 秦臻(1993—），男，重庆人，硕士研究生，研究方向为矿物学、岩石学、矿床学；长春市建设街2199号，吉林大学地球科学学院，130061；E-mail:qinzhen678@163.com
- 通讯作者：
- E-mail:sundy@jlu.edu.cn,13500807923
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Characteristics of fluid inclusions and metallogenic physicochemical conditions of Songjianghe Gold Deposit in Dunhua,Jilin Province
- English Author：
- College of Earth Sciences,Jilin University|College of Earth Sciences,Jilin University&Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Land and Resources|China Gold Group Resources Co.,Ltd.|China Gold Group Resources Co.,Ltd.|China Gold Group Resources Co.,Ltd.|College of Earth Sciences,Jilin University
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
松江河金矿床位于夹皮沟—海沟金成矿带的中部，矿体主要产于新太古界色洛河岩群中部岩性段的底部,其热液成矿作用可划分为石英-黄铁矿、多金属硫化物-石英、石英-碳酸盐3个阶段。流体包裹体岩相学研究表明，多金属硫化物-石英阶段主要发育气液二相包裹体、含CO2三相包裹体及少量纯CO2包裹体。测温结果显示，成矿流体具有低盐度（1.38 %～6.81 %NaCleqv）、低密度（0.41～0.86 g/cm3）的特点，成矿温度集中于260 ℃～390 ℃，成矿压力为70～106 MPa，成矿深度为6.8～8.7 km。成矿过程中，流体经过了H2O-CO2-NaCl体系的不混溶，导致金在成矿流体中的溶解度降低，发生沉淀作用并富集形成金矿床。
关键词:
松江河金矿床；地质特征；成矿流体；流体包裹体；物理化学条件
Abstract:
The Songjianghe Gold Deposit is located in the central region of Jiapigou-Haigou Gold Belt.The ore bodies mainly occur in the bottom of the middle lithologic part of Seluohe Group of the Neoproterozoic.The hydrothermal mineralization can be classified into three stages: quartz-pyrite,polysulfide-quartz and quartz-marble.The petrographic study of the fluid inclusions shows that there are three types of fluid inclusions that develop in polysulfide-quartz stage including gas-aqueous two-phase inclusions,CO2-bearing three-phase inclusions and a small amount of pure CO2 inclusions.The micro-thermometric research reveals that the ore-forming fluids show the features of low salinity(1.38 %-6.81 % NaCleqv) and low density(0.41~0.86 g/cm3).Mineralization temperature is concentrated in the range from 260 ℃ to 390 ℃,and the pressure ranges from 70 MPa to 106 MPa,the mineralization depth ranges from 6.8 km to 8.7 km.During mineralization,fluid immiscibility occurred in H2O-CO2-NaCl system in the ore-forming process,leading to lower gold solubility in ore-forming fluids,precipitation and enrichment to gold deposit.
Keywords:
Songjianghe Gold Deposit;geologic characteristics;ore-forming fluid;fluid inclusion;physicochemical condition
