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吉林二道沟金矿床地质特征及成矿物理化学条件研究
- 作者：
- 叶柄杨|高茂凯|?跤钚鵿杨贺|张超
- 作者单位：
- 白城师范学院土木工程学院|白城师范学院旅游与地理科学学院|吉林大学《吉林大学学报（地球科学版）》编辑部|白城师范学院旅游与地理科学学院&吉林大学地球科学学院|山东理工大学资源与环境工程学院
基金项目：
- 吉林省自然科学基金项目（YDZJ202401533ZYTS）；吉林省科学技术协会重点科普项目（KPCX3）
详细信息：
- 作者简介：
- 叶柄杨（1994—），男，讲师，硕士，从事热液金属成矿理论研究工作；E-mail：435839166@qq.com
- 通讯作者：
- 张超（1986—），男，副教授，博士，从事岩浆活动与构造运动研究工作；E-mail：czhang@sdut.eud.cn
- PDF下载
Geological characteristics and physicochemical ore-forming conditions of Erdaogou Gold Deposit,Jilin Province
- English Author：
- School of Civil Engineering,Baicheng Normal University|School of Tourism and Geographic Sciences,Baicheng Normal University|Editorial Department of Journal of Jilin University(Earth Science Edition),Jilin University|School of Tourism and Geographic Sciences,Baicheng Normal University&College of Earth Sciences,Jilin University|School of Resources and Environmental Engineering,Shandong University of Technology
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
二道沟金矿床是中国金矿的重要产区之一，但前人对其成矿物理化学条件研究程度较低。为进一步探究矿床成因，本次工作在前人研究的基础上，通过构建热力学模型，揭示成矿过程中物理化学条件的状态。通过建立二道沟金矿床及邻近的3个金矿床（本区、三道岔和八家子）主成矿阶段温度和压力的热力学模型，估算了4个矿床主成矿阶段成矿物理化学条件分别为：本区金矿床pH值为4.314~7.186,lg fO2为-35.617~-40.825；二道沟金矿床pH值为3.04~7.228,lg fO2为-40.576~-49.646；八家子金矿床pH值为4.041~7.137,lg fO2为-36.829~-42.315；三道岔金矿床pH值为4.405~7.181,lg fO2为-34.469~-39.277。结果表明：主成矿阶段成矿流体的pH值逐渐由低变高，流体性质由酸性向中性演化，lg fO2出现由高氧逸度向低氧逸度转变，结合流体包裹体及H-O同位素研究结果，表明成矿流体与大气降水具有密切联系。
关键词:
流体地球化学；热力学模拟；成矿；物理化学条件；二道沟金矿床；流体包裹体；pH
Abstract:
Erdaogou Gold Deposit is one of China’s source areas of gold production,but its physicochemical ore-forming conditions have been insufficiently studied.To further explore the deposit genesis,based on previous research,this study constructed thermodynamic models to analyze the physicochemical conditions during ore formation.Thermodynamic models of temperature and pressure for the main ore-forming stages of Erdaogou Gold Deposit and 3 nearby deposits (Benqu,Sandaocha,and Bajiazi) were established to estimate the physicochemical parameters during the main ore-forming stage of the 4 deposits,which were as follows:pH 4.314-7.186,lg fO2-35.617 to-40.825 for Benqu Gold Deposit; pH 3.04-7.228,lg fO2-40.576 to-49.646 for Erdaogou Gold Deposit;pH 4.041-7.137,lg fO2-36.829 to-42.315 for Bajiazi Gold Deposit; pH 4.405-7.181,lg fO2-43.469 to-39.277 for Sandaocha Gold Deposit.The results indicate that during the main ore-forming stage,the fluid’s pH gradually increased from low to high,evolving from acidic to neutral.The lg fO2 showed a transition from high to low oxygen fugacity.Combined with fluid inclusion and H-O isotope studies,the findings suggest a close relationship between ore-forming fluids and meteoric water.
Keywords:
fluid geochemistry;thermodynamic simulation;ore formation;physicochemical conditions;Erdaogou Gold Deposit;fluid inclusions;pH
