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Fluid inclusions and he-ar isotopes in pyrite from the Yinjiagou deposit in the southern margin of the North China Craton:A mantle connection for poly-metallic mineralization

Fluid inclusions and He-Ar isotopes in pyrite from the Yinji...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Ming-Tian Zhu Lian-Chang Zhang Guang Wu Huai-Yu he Min-Li Cui Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Institute of Mineral Resources Chinese Academy of Geological Sciences Key Laboratory of the Earth's Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences

The Yinjiagou poly-metallic deposit is located at the southern margin of the North China Craton(SMNCC).Pyrite, the most economically important mineral,is associated with Cu,Mo,Au,Pb,Zn and Ag *** main mineralization stages have been identified and studied:a porphyry stage,including the quartz-molybdenite and quartz-sericite-pyrite(QSP)veins,and a vein stage,including the early and the late(economically most important) pyrite stages. Three types of fluid inclusions arc distinguished in quartz and pyrite,including liquid-rich,vapor-rich biphase (LV)and halite-bearing *** transmitted and infrared microthermometry produced several results. (1)Each of the three types of fluid inclusions is trapped in the quartz of the porphyry stage,with homogenization temperatures of 335-419℃and salinities of 4.7-49.6 wt.%NaCl *** coexistence of halite-bearing inclusions and low density,vapor-rich biphase(LV)inclusions indicates that the fluid was boiling. The boiling elevated the Fe and S levels in the hyper-saline fluid,as reflected by the development of pyrite, chalcopyrite and S daughter minerals in the halite-bearing inclusions.(2)The fluid in the early pyrite also displays features characteristic of boiling,with homogenization temperatures of 352->400℃and salinities of 3.7-42.4 wt.%NaCl *** the late pyrite only contains liquid-rich biphase(LV)inclusions,with homogenization temperatures of 263-354℃and salinities of 6.0-21.3 wt.%NaCl *** relationship between the decreasing salinity and the corresponding decreasing homogenization temperature clearly indicates extensive mixing and dilution.(3)Finally,the infrared calibration indicates that the impact of infrared light intensity on the microthermometric results for the Yinjiagou pyrite-hosted fluid inclusions is limited The he-ar isotopic analysis of the fluid inclusions in the pyrite indicates two different fluid sources that involve abundant mantle *** he/he ratios in the porphyry

关键词： Fluid inclusions he-ar isotopes Pyrite Mantle-derived fluid Yinjiagou deposit SMNCC

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