汉阴北部吴家湾金矿地质特征及流体包裹体研究

闫馨云; 焦建刚; 董一博; 祁东; 冷馨; 刘超

汉阴北部吴家湾金矿地质特征及流体包裹体研究

1. 长安大学地球科学与资源学院, 陕西西安 710054;

2. 西部矿产资源与地质工程教育部重点实验室, 陕西西安 710054;

3. 国土资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054

基金项目:
中央高校基本科研业务费项目“中酸性小岩体岩浆作用与成矿”（300102278401），国家自然基金资助项目“阿拉善成岩成矿”（211027160237）联合资助的成果

详细信息

作者简介: 闫馨云(1995-),女,硕士研究生,现主要从事矿床学及地球化学研究工作。E-mail:yanxinyun@chd.edu.cn

通讯作者: 焦建刚(1976-),男,教授,主要从事矿床学研究与教学。E-mail:jiangang@chd.edu.cn

中图分类号: P624;P618.51

收稿日期: 2019-04-01

修回日期: 2019-08-12

Geological Characteristics and Fluid Inclusions of the Wujiawan Gold Deposits in Northern Hanyin, Shaanxi

1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China;

2. Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, Shaanxi, China;

3. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, Xi'an, 710054, Shaanxi, China

More Information

Corresponding author: JIAO Jiangang, jiangang@chd.edu.cn

Received Date: 01 April 2019

Revised Date: 12 August 2019

摘要

摘要: 吴家湾金矿是汉阴北部地区的一个重要的金矿床，处于南秦岭石泉-神河韧性滑脱逆冲推覆带。对其进行野外地质研究发现，吴家湾金矿赋矿层位为梅子垭组第一岩性段第四岩性层（S₁m₁⁴），岩性主要为含碳绢云片岩夹硅质岩；控矿构造主要为RFa和RFb 2条顺层韧性剪切带，大致可分辨出S₁、S₂及S₃ 3期构造面理，S₀几乎全部被置换，S₂期变形与金矿成矿关系密切，金矿体主要于该期形成的韧性剪切带中产出。在地质研究基础上，可将吴家湾金矿区石英脉划分为3期，对流体包裹体的研究表明，包裹体类型以气液两相包裹体为主，纯气相、纯液相及三相包裹体较少见；均一温度范围介于176.8~344.4℃，集中于230~280℃。盐度范围为0.35%~13.51%，集中于2%~10%，成矿流体属于中-低温、低盐度流体。流体捕获深度在1.38~3.47 km，集中于1.5~2.8 km，于中浅部成矿。S₂期石英脉流与成矿关系紧密，流体包裹体均一温度主要集中在240~280℃，为主成矿期流体。激光拉曼光谱分析表明气液两相包裹体液相成分以H₂O为主，含少量CO₂和CH₄；气相成分主要为CO₂，其次为CH₄、N₂及H₂S；包裹体类型主要为富含CO₂的H₂O-CO₂体系包裹体。对汉阴北部不同地区流体包裹体的性质进行对比研究后发现，流体包裹体均一温度为190~260℃，盐度为6%~10%，在这个区间内有利于成矿。
- 南秦岭 /
- 吴家湾金矿 /
- 流体包裹体 /
- 找矿方向
Abstract: The Wujiawan gold deposit is an important gold deposit in northern Hanyin, Shaanxi. It is located at the Shiquan-Shenhe thrust-napped ductile shear zone in South Qinling. The field geological study found that the ore-bearing horizon of the Wujiawan gold deposit is the fourth lithological layer (S₁m₄¹) of the first lithology section of the Meiziya Formation, and this layer is mainly composed of carbon-bearing sericite schist with siliceous rocks; The structure is mainly composed of two layer ductile shear zones (RFa and RFb), which can roughly distinguish the three-phase structural facies of S₁, S₂ and S₃. In which, S₀ is almost completely replaced, and S₂ deformation is closely related to gold mineralization. Gold ore body was mainly formed in the ductile shear zone during S₂ deformation. Based on geological research, the quartz veins from the Wujiawan Gold Mine can be divided into three phases. The study of fluid inclusions shows that these inclusions are dominated by gas-liquid two-phase inclusions, with rare pure gas phase, pure liquid phase and three-phase inclusions. Their homogeneous temperatures range from 176.8℃ to 344.4℃, which is concentrated at 230~280℃. Their salinity vary from 0.35 wt% to 13.51 wt% and are concentrated in 2~10 wt%. The ore-forming fluid belongs to medium-low temperature and low salinity fluid. The fluid capture depth is 1.38~3.47 km and is concentrated at 1.5~2.8 km, and the mineralization is occurred in the middle and shallow parts. The fluid inclusions of quartz vein in S₂ stage are closely related to mineralization, their homogeneous temperatures are mainly concentrated at 240~280℃, which are the fluid in the main ore-forming period. Laser Raman spectroscopy analysis shows that the liquid phase composition of gas-liquid two-phase inclusions is dominated by H₂O, containing a small amount of CO₂ and CH₄. The gas phase components are mainly CO₂, followed by CH₄, N₂ and H₂S. The inclusion types are mainly H₂O-CO₂ system inclusions with rich CO₂. Compared to the properties of fluid inclusions in different areas of northern Hanyin, it is found that the homogeneous temperatures of fluid inclusions range from 190℃ to 260℃, and their salinities vary form 6 wt% to 10 wt%, which are beneficial to mineralization.
- South Qinling /
- Wujiawan gold deposit /
- fluid inclusion /
- prospecting direction

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