| 翟媛媛.内蒙古商都县双井子层控金矿床的成矿流体特征[J].地质与勘探,2016,52(3):438-450 |
| 内蒙古商都县双井子层控金矿床的成矿流体特征 |
| Characteristics of ore-forming fluids of the Shuangjingzi strata bound gold deposit in Shangdu County, Inner Mongolia |
| 投稿时间：2015-10-22 修订日期：2016-04-26 |
| DOI： |
| 中文关键词: 流体包裹体 层控性金矿床 石英脉期次 双井子 内蒙古 |
| 英文关键词: fluid inclusion, strata bound ore deposit, quartz vein stages, Shuangjingzi, Inner Mongolia |
| 基金项目:中国科学院地质与地球物理研究所所地合作项目（11351760） |
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| 中文摘要: |
| 内蒙古双井子金矿为赋存于浅变质含碳细碎屑岩系地层中的层控型金矿床，其直接赋矿围岩为白云鄂博群中的比鲁特组碳质板岩/碳质千枚状板岩和褐铁矿化的石英岩。这种浅变质含碳细碎屑岩系中广泛存在多期次与金矿化相关的石英脉。本文划分这些与金矿化相关的石英脉体的期次，应用冷热台和原位激光拉曼光谱等分析技术，探讨双井子层控金矿的成矿流体特征。结果表明，根据石英脉体野外穿插关系可将其划分为两个期次：第Ⅰ期是产于比鲁特组碳质板岩中的顺层石英脉，第Ⅱ期石英脉产于比鲁特组褐铁矿化的石英岩中，部分为切过第Ⅰ期碳质板岩顺层石英脉的石英细脉。流体包裹体均一温度集中在180℃～280℃，盐度集中在4.0 wt% NaClequiv～15.0wt% NaClequiv，流体的密度范围0.76 g/cm3～0.98 g/cm3，推测双井子金矿为中低温、中低盐度层控型热液矿床。激光Raman光谱分析结果表明，双井子矿区成矿流体属于CO2-CH4-SO2-H2O-NaCl体系。两期流体均具有中温、中盐度及弱还原性的特征，且成分复杂，第Ⅰ期可能为深源岩浆与浅部壳体岩层相互反应而产生的混源流体，使地层中成矿组分发生弱富集；第Ⅱ期为主成矿期，其流体很有可能是区内混合了地表水的岩浆期后热液。 |
| 英文摘要: |
| The Shuangjingzi gold deposit is a strata bound ore deposit occurring in metamorphic carbonaceous clastic rock. The host rock of this deposit is carbonaceous slate and carbonaceous phyllitic slate of Bilute Formation where the quartz veins, correlated gold mineralization are exposed extensively. This work made a division of the stages of quartz veins, and used the application of hot and cold platforms and laser Raman spectra classification technology to reveal characteristics of fluid inclusions and to explore features of ore-forming fluids of the Shuangjingzi deposit. The results show that quartz veins can be divided into two stages: stage I hosted in the carbonaceous slate of Bilute Formation, and stage II hosted in the limonitization quartz rock of Bilute Formation, where partial quartz veins cutting through the first stage of quartz vein. The homogenization temperature of fluid inclusions concentrates in 160℃~280℃ with the salinity concentrating in 4.0wt% NaClequiv to 15.0wt% NaClequiv , and density of fluid concentrating in 0.76 ~ 0.98g/cm3. It indicates that the Shuangjingzi gold deposit formed in medium-low temperature and low salinity. With respect to the composition of fluid inclusions, the laser Raman spectrum analysis shows that the ore-forming fluid could be the system CH4-CO2-SO2-H2O-NaCl. The fluids of these two stages are characterized by medium- low temperature, medium salinity and weak reducibility. The former is mixed with water which was interacted by deep source magma rock and shallow crust. Weak enrichment of ore-forming components occurs in the stratum.The latter occurred in the main?gold deposit-forming period, which was probably post-magmatic hydrothermal mixed with surface water. |
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