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大兴安岭北段八里房金矿床流体包裹体特征及矿床成因
- 作者：
李向文1，2，张富程3*，王冠1，2，刘世明1，2，韩添1，2
- 作者单位：
- （1. 黑龙江科技大学矿业工程学院；2. 黑龙江省昂昂溪实物地质资料野外科学观测研究站； 3. 中国地质调查局海口海洋地质调查中心）
基金项目：
- 中国地质调查局地质调查项目（〔2023〕02-44-11/DD20230395）和 2024 年度黑龙江省省属高等学校基本科研业务费项目（2024-KYY⁃WF-1110）
详细信息：
- 作者简介：
- 李向文（1976—），男，高级工程师，博士，从事固体矿产勘查教学与研究工作；E⁃mail:872416149@qq. com
- 通讯作者：
- 张富程（1990—），男，工程师，硕士，研究方向为地质信息化与找矿；E⁃mail：1109590617@qq. com
- PDF下载
Fluid inclusion characteristics and genesis of the Balifang Gold Deposit in the northern Greater Khingan Mountains
- English Author：
Li Xiangwen¹，², Zhang Fucheng³, Wang Guan¹，², Liu Shiming¹，², Han Tian¹，²
- Unit：
- （1. School of Mining Engineering, Heilongjiang University of Science and Technology； 2. Ang’angxi Physical Geological Data Field Observation & Research Station of Heilongjiang Province； 3. Haikou Marine Geological Survey Center of China Geological Survey）
- 摘要
- 在线预览
- 参考文献
摘要:
八里房金矿床位于大兴安岭北段漠河盆地西部，矿体主要受韧性剪切带次级断裂控制，矿化类型主要为石英脉型。热液期 4个成矿阶段中Ⅱ、Ⅲ阶段为主成矿阶段，其中，Ⅱ阶段流体包裹体较为发育，除气液两相包裹体外，还有含CO2三相包裹体、富CO2包裹体和纯CO2包裹体，而Ⅲ、Ⅳ阶段仅发育气液两相包裹体。气液两相包裹体中主要由CO2、N2、CH4和H2O组成，属于CO2-N2-CH4-H2O体系，含有少量有机质。Ⅱ～Ⅳ阶段气液两相包裹体完全均一温度峰值分别集中于200 ℃～260 ℃、180 ℃～240 ℃、160 ℃～190 ℃，盐度峰值分别集中于 5 %～8 %、4 %～7 %、5 %～6 %，温度和盐度均呈逐渐降低趋势；基于流体压力-温度估算，主成矿阶段成矿深度为1.35～2.36 km。综合对比分析认为，八里房金矿床形成于蒙古—鄂霍茨克洋造山晚期伸展环境，成因类型更接近浅成造山型，可能存在浅成低温热液的叠加或改造。
关键词:
八里房金矿床；流体包裹体；浅成造山型；矿床成因；大兴安岭北段；成矿温度；矿床类型
Abstract:
The Balifang Gold Deposit is located in the western part of the Mohe Basin, in the northern segment ofthe Greater Khingan Mountains. The orebodies are mainly controlled by secondary faults within a ductile shear zone,and the mineralization is dominated by quartz vein⁃type. Among the 4 hydrothermal stages, stages Ⅱ and Ⅲ are themain ore⁃forming stages. Stage Ⅱ features well⁃developed fluid inclusions, including not only gas⁃liquid two⁃phaseinclusions but also CO₂⁃bearing three⁃phase, CO₂⁃rich, and pure CO₂ inclusions, whereas stages Ⅲ and Ⅳ only developgas⁃liquid two⁃phase inclusions. The gas⁃liquid two⁃phase inclusions are primarily composed of CO₂, N₂, CH₄, and H₂O,constituting a CO ₂ -N ₂ -CH ₄ -H ₂O system, with traces of organic matter. The homogenization temperature peaks ofgas⁃liquid inclusions in stages Ⅱ-Ⅳ are concentrated at 200 °C-260 °C, 180 °C-240 °C, and 160 °C-190 °C,respectively; the corresponding salinity peaks are 5 %-8 %, 4 %-7 %, and 5 %-6 %, indicating a gradual decline inboth temperature and salinity over time. Based on fluid pressure-temperature estimates, the ore⁃forming depth duringthe main mineralization stage is approximately 1.35-2.36 km. Comprehensive analysis suggests that the Balifang GoldDeposit formed in an extensional setting during the late stage of the Mongol-Okhotsk ocean orogenic belt evolution.The genesis is more closely related to an epizonal orogenic⁃type system, with possible overprinting or modification byepithermal low⁃temperature fluids.
Keywords:
Balifang Gold Deposit; fluid inclusions; epizonal orogenic type; deposit genesis; northern GreaterKhingan Mountains; ore⁃forming temperature; deposit type
