新疆阿克塔木金矿床流体特征及成矿时代研究
Fluid characteristics and metallogenic age of Aktamu gold deposit,Xinjiang,China
陈丽娟 1司建涛 2张广平 3李假广 3杨世权 3冉钊 2杨达2
作者信息
- 1. 河南省豫地科技集团有限公司,河南 郑州 450000
- 2. 河南省第二地质矿产调查院有限公司,河南 郑州 450001
- 3. 河南省地质局矿产资源勘查中心,河南 郑州 450006
- 折叠
摘要
新疆阿克塔木金矿床位于新疆准噶尔盆地西部,哈图山金成矿带西南缘,通过对该区域的矿床地质特征、矿床流体特征和成矿时代的研究,有助于了解该区域的矿床成因和形成机制.研究区内塔斯阔腊岩体为高钾碱性花岗岩,锆石U-Pb年代学测定其成岩年龄为(314.9±1.5)Ma,成岩时代为晚石炭纪,指示成矿时代应晚于314.9 Ma;阿克塔木金矿床含金石英脉中的包裹体有富液两相包裹体(Ⅰ型)、富气两相包裹体(Ⅱ型)和含CO2三相包裹体(Ⅲ型),以富液两相包裹体为主;成矿流体具中低温(主要峰值集中于185～325℃范围,平均256℃)和低盐度(0.18%～12.87%,平均5.21%)的特点;氢-氧同位素研究表明参与成矿的流体主要为深部来源的混合流体.研究结果表明阿克塔木金矿床为中低温热液型金矿床,对该金矿床的研究工作可为后续地质勘查工作提供理论依据,并扩大找矿成果.
Abstract
Xinjiang Aktamu gold deposit is located in the western part of the Junggar Basin in Xinjiang,which is the southwest edge of the Hatu Mountain gold mineralization belt.The study of the geological characteristics,fluid and the age of mineralization in this area will help to understand the genesis and formation mechanism of the deposit in this area.In the study area,the Taskuala rock body is a high-potassium alkaline granite,and the zircon U-Pb age is(314.9±1.5)Ma.The granite intruded in the Late Carboniferous,and the mineralization is slightly later than magmatic activity.The inclusions in the quartz at the main-mineralization stage of the Aktamu gold mine are liquid-rich two-phase inclusions(Type I),gas-rich two-phase inclusions(Type Ⅱ),and CO2-containing three-phase inclusions(Type Ⅲ),with liquid-rich two-phase inclusions predominating.The mineralized fluids are characterized by low to medium temperatures(main peaks are concentrated in the range of 185-325℃,with an aver-age of 256℃)and low salinity(0.18%-12.87%,with an average of 5.21%).Hydrogen-oxygen isotope studies sug-gest that the fluids involved in mineralization are mainly mixed fluids of deep origin.The above research work indicates that the Aktamu gold deposit is a medium to low-temperature hydrothermal gold deposit,and the study of its characteristics can provide a theoretical basis for the subsequent geological exploration work and expand the results of the mineral search.
关键词
阿克塔木金矿床/流体特征/成矿时代/新疆Key words
Aktamugold deposit/fluid characteristics/metallogenic age/Xinjiang引用本文复制引用
基金项目
河南省地质矿产勘查开发局项目(豫地矿[2020]03号)
出版年
2024
NETL
NSTL
万方数据