Fluid Inclusion Characteristics and Metallogenic Model of the Aqishan Pb-Zn (Cu) Deposit, Shanshan County, Xinjiang
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摘要: 阿奇山铅锌(铜)矿床是东天山觉罗塔格成矿带西段新发现的大型铅锌(铜)矿床,具有超大型矿床潜力。在分析矿床地质特征的基础上,对主成矿阶段的矿石矿物(闪锌矿、石英、方解石、石榴子石)进行流体包裹体测温和盐度测试。结果表明:包裹体以气液型两相为主,含子晶的三相包裹体少量,气液两相包裹体气液比为5%~10%,均一温度与盐度分别为94.8~440.1℃和4.8%~44.32%;其中闪锌矿明显分为高温闪锌矿(331℃)和低温闪锌矿(145~181℃),盐度主要分布在8%~14%和18%~22%。通过对流体包裹体的研究,结合矿床地质地球化学研究成果,显示阿奇山铅锌(铜)矿床主要存在早期硅酸岩热液和晚期碳酸盐热液2个成矿阶段,二者叠加部位为主成矿阶段,成矿流体具有低温、中盐度的特征,进而总结了矿床成矿模式。Abstract: The Aqishan Pb-Zn (Cu) deposit is a newly discovered large-scale Pb-Zn(Cu) deposit in the western section of the Jurassicta metallogenic belt in eastern Tianshan Mountains,with the potential of super-large deposits. Based on the analysis of the geological characteristics of the deposit,the ore minerals (sphalerite,quartz,calcite,garnet) in the main ore-forming stage were tested by fluid inclusion temperature and salinity. The results show that the inclusions are mainly two-phase of gas-liquid; three-phase inclusions containing seed crystals are few. The gas-liquid ratio in gas-liquid two-phase inclusions is 5%~10%,and the uniform temperature is 94.8~440.1°,the salinity is 4.8%~44.32% respectively. Sphalerite is obviously divided into high-temperature sphalerite (331℃) and low-temperature sphalerite (145~181℃). Salinity is mainly distributed in 8~14% and 18~22%.The study of fluid inclusions,combined with the geological and geochemical research of the deposits,shows that The Aqishan Pb-Zn (Cu) deposit mainly exists in the early stage of silicate hydrothermal fluid and in the late stage of carbonate hydrothermal fluid. The interacted part of the two is the main ore-forming stage, with the characteristics of low-temperature and medium salinity in the ore stage,and thus summarizing the ore-forming model of the deposit.
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Keywords:
- Skarn /
- fluid inclusion /
- genesis /
- metallogenic model /
- Aqishan Pb-Zn (Cu) ore
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