Hydrogen and Oxygen Isotope Study on the Water-Rock Interaction of the Yinshan (Cu-) Pb-Zn-Ag Ore Deposit, Jiangxi Province  

作　　者：Zhang Ligang, Liu Jingxiu, Yu Guixiang and Chen Zhensheng Yichang Institute of Geology and Mineral Resources, CAGS, Yichang, Hubei Jiang Minxi 

出　　处：《Acta Geologica Sinica(English Edition)》1996年第3期274-289,共16页地质学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China (Grant No. 49473176);the Chinese Foundation for the Development of Geological Science and Technology(Grant No. 89042)

摘　　要：The δ18O values of vein quartz of different stages from the Yinshan ore deposit are constant around 16‰ and the calculated δ18OH2O values attain 8‰± ; the δDH2O values of fluid inclu-sions in vein quartz are constant at about-60‰. From the surface down to 1200 m below the δ18O values of altered rocks gradually decrease from 15‰± to 11‰± . Various water-rock inversion calculations indicate that the ore fluids were formed by the interaction between meteoric water and phyllite at 350℃ and the effective W/ R value of around 0.1. When the water-rock exchange in the upper mineralization system took place, the effective W / R value increased to 5.0 or more. As a result, an evolution and mineralization model of a buffered open system with two-stage water-rock interactions is proposed in this study.The δ18O values of vein quartz of different stages from the Yinshan ore deposit are constant around 16‰ and the calculated δ18OH2O values attain 8‰± ; the δDH2O values of fluid inclu-sions in vein quartz are constant at about-60‰. From the surface down to 1200 m below the δ18O values of altered rocks gradually decrease from 15‰± to 11‰± . Various water-rock inversion calculations indicate that the ore fluids were formed by the interaction between meteoric water and phyllite at 350℃ and the effective W/ R value of around 0.1. When the water-rock exchange in the upper mineralization system took place, the effective W / R value increased to 5.0 or more. As a result, an evolution and mineralization model of a buffered open system with two-stage water-rock interactions is proposed in this study.

关 键 词：H and O isotopes water-rock exchange buffered open system Yinshan of Jiangxi Province 

分 类 号：P618.41[天文地球—矿床学]