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现代地质 ›› 2009, Vol. 23 ›› Issue (3): 456-464.

• 矿床与矿物学 • 上一篇    下一篇

黑龙江省黑河市北大沟金矿床流体包裹体研究

吕军1,2,3,莫宣学1,2,赵志丹1,2,韩振哲1,2,3   

  1. 1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;2中国地质大学 地球科学与资源学院,北京100083; 
    3黑龙江省地质调查研究总院 齐齐哈尔分院,黑龙江 齐齐哈尔161005
  • 收稿日期:2009-01-19 修回日期:2009-04-09 出版日期:2009-06-20 发布日期:2011-12-21
  • 作者简介:吕军,男,高级工程师,博士研究生,1965年出生,矿物学、岩石学、矿床学专业,从事金属矿床地球化学研究工作。E-mail:qqlj1188@163.com。
  • 基金资助:

    国家矿产资源补偿费项目(2003-2007);中央财政补助项目(2006);中国地质大学地质过程与矿产资源国家重点实验室资助项目

Study of Fluid Inclusions of Beidagou Gold Deposit in Heihe City, Heilongjiang Province

LV Jun1,2,3, MO Xuan-xue1,2, ZHAO Zhi-Dan1,2,HAN Zhen-zhe1,2,3   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
    3Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar,Heilongjiang161005, China
  • Received:2009-01-19 Revised:2009-04-09 Online:2009-06-20 Published:2011-12-21

摘要:

黑龙江省黑河市北大沟金矿床是近年来在大兴安岭燕山期成矿带发现的小型金矿床。对石英脉中流体包裹体岩相学研究、显微测温和气液相成分分析表明:(1)主成矿阶段石英脉中发育纯液相、气液两相、富气相和纯气相4类包裹体。(2)流体包裹体均一温度在160~380 ℃之间,主要集中在260~300 ℃;成矿流体为NaCl-H2O体系;流体包裹体盐度估计在0.2%~2.0%(NaCleq)之间;成矿流体密度估计在0.550~0.912 g/cm3之间;成矿压力估计在6×105~210×105 Pa之间;估算成矿深度为0.06~2.10 km。(3)从流体包裹体成分分析获得的pH值为6.6~6.7之间,还原参数n(CH4+CO+H2)/n(CO2)(摩尔数比值)在0.027~0.271之间,表明具有浅成中偏酸性和弱还原环境成矿的特点。该矿床是与火山热液有关的浅成中—低温热液金矿床。

关键词: 北大沟金矿床, 流体包裹体, 中—低温热液, 黑龙江

Abstract:

Beidagou gold deposit is a newly-discovered small-size gold deposit, located in the Yanshanian Da-hinggan Mountain metallogenic belt.The petrographic study, microthermometry and component analysis of fluid inclusions in quartz veins show that (1) Four types of fluid inclusions were found in the mineralized quartz veins, i.e., liquid inclusions, two-phase liquid-vapor inclusions, vapor rich inclusions, and vapor inclusions; (2) Homogenization temperatures of fluid inclusions in quartz ranged from 160 ℃to 380 ℃, the ore-forming fluid belonged to NaCl-H2O system, salinity ranged from 0.2% to 2.0% (NaCleq), density ranged from 0.550 g/cm3 o 0.912 g/cm3,and pressure ranged from 6×105  Pa to 210×105  Pa, corresponding to the depth ranging from 0.06 km to 2.10 km; (3) pH values of ore-forming fluid ranged from 6. to 6.7, and (CH4+CO+H2)/n(CO2)values in mole fraction ranged from 0.027 to 0.271, indicating a weak acidity and reducing environment. All these characteristics indicate that Beidagou gold deposit is a mesothermal-epithermal gold deposit related to the Yanshanian volcanism

Key words: Beidagou gold deposit, fluid inclusion, mesothermal-epithermal, Heilongjiang Province

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