胶东蓬莱大柳行金矿田燕山金矿床流体包裹体特征和氢- 氧同位素研究
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本文为山东省地矿局深部找矿创新团队项目“胶东深部金矿资源评价方法与预测(编号KY2018002)”资助成果。


Fluid inclusions and stable isotopes study of Yanshan gold deposit in the Penglai area, eastern Shandong Province
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    摘要:

    燕山金矿床分布在胶东栖霞- 蓬莱成矿带上的大柳行金矿田内,它是一座典型的石英脉型金矿床,矿体呈脉状或透镜状产于中生代花岗岩内部的断裂体系中。该矿床成矿热液过程至少可划分为4个成矿阶段,从早到晚分别是钾长石- 黑云母- 石英阶段、石英- 黄铁矿阶段、多金属硫化物阶段及石英- 碳酸盐阶段,其中2、3阶段为主成矿阶段。成矿阶段的流体包裹体有5种类型,分别是气液两相包裹体(Ⅰ型)、纯液相包裹体(Ⅱ型)、含CO2三相包裹体(Ⅲ型)、纯气相包裹体(Ⅳ型)及含子矿物三相包裹体(Ⅴ型);激光拉曼探针分析显示成矿流体气相成分主要为CO2,另含少量CH4、N2、H2S及有机质等,总体属于CO2- H2O- NaCl体系。通过显微测温获得主成矿阶段成矿流体完全均一的温度在167~393℃之间,盐度为2. 04%~11. 51%NaCleq,密度为0. 54~0. 91g/cm3,整体呈现中低温、低盐度、低密度特点;对应的δ18O H2O值为2. 9‰~6. 6‰,δD值为-82. 9‰~-70. 5‰,显示成矿流体来源于深部流体,以岩浆水为主,其次有少量大气水加入。综合特征揭示,该矿床应属于中低温热液脉型金矿床。

    Abstract:

    Yanshan gold deposit is located within the Daliuhang gold field of the Qixia- Penglai metallogenic belt in the Jiaodong Peninsula. It is a typical quartz vein type gold deposit with orebodies occurring in the Mesozoic granite rocks, controlled by faults and present in lenticular or vein forms. Hydrothermal mineralization can be divided into four stages: potash feldspar- biotite- quartz stage, pyrite- quartz stage, polymetallic sulfide stage and quartz- calcite stage, with stages 2 and 3 as the main mineralization stages. The characteristics of the fluid inclusions from gold ores show that they can be divided into five types: two- phase vapor inclusions (Ⅰ), liquid inclusions (Ⅱ), liquid CO2- rich inclusions (Ⅲ), vapor inclusions (Ⅳ), and high saline halite- bearing inclusions (Ⅴ). The results of Laser Raman spectra study show that the composition of volatile phases is mainly CO2, less CH4, N2, H2S, organic matter and so on. The ore- forming fluid belongs to NaCl- H2O- CO2 brine system. The homogenization temperatures range from 167 ~393℃, the peaks from 260~320℃, the salinities from 2. 04%~11. 51%NaCleq. NaCland the density range from 0. 54~ 0. 91g/cm3. These evidences from the fluid inclusions suggest that the ore- forming fluid was medium- low temperature, medium- low salinity and medium- low density. The values of δ18OH2O and δD are 2. 9‰~6. 6‰ and -82. 9‰~-70. 5‰ respectively. The composition of the oxygen and hydrogen isotope demonstrates that the ore- forming fluid is derived from mainly magmatic water and mixed with parts of meteorological water. On the basis of the geological and fluid inclusion features, we conclude that the Yanshan deposit is a medium- low thermal gold deposit.

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马顺溪,白宜娜,孙永联,舒记德.2020.胶东蓬莱大柳行金矿田燕山金矿床流体包裹体特征和氢- 氧同位素研究[J].地质学报,94(11):3391-3403.
MA Shunxi, BAI Yina, SUN Yonglian, SHU Jide.2020. Fluid inclusions and stable isotopes study of Yanshan gold deposit in the Penglai area, eastern Shandong Province[J]. Acta Geologica Sinica,94(11):3391-3403.

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  • 收稿日期:2019-07-19
  • 最后修改日期:2020-05-08
  • 录用日期:2020-02-08
  • 在线发布日期: 2020-10-16
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