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《JOURNAL OF CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY》 1998-01
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THE COMPONENTS AND EVOLUTION OF THE HYDROGEN AND OXYGEN ISOTOPES OF ORE-FORMING FLUIDS FORM LA’ERMA GOLD ORE BELT

Liu Jiajun 1,Zheng Minghua 2, Zhou De′an 3, Liu Jianming 4, Zhou Yufeng 2, Gu Xuexiang 2, Zhang Bin 2, Lin Li 2 (1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002; 2. Institute of Mineral Deposit, Chengdu Institute o  
The La′erma gold ore belt, in the south subzone of western Qinling,include La′erma and Qiongmo ore deposits and Yaxiang ore occurrence.These stratabound gold deposits are closely associated with submarine exhalative sedimentation and possess many unique features. The gold deposits in the Cambrian silicalite formation composed of black chert and slate are so clearly confined by strata, host rock types and structures that their stratabound character is well accepted. The hydrothermal minerals such as quartz and barite in the gold ore belt have their δ 18 O values -3.19‰~+26.71‰, leading to ore-forming fluids with δ 18 O of -11.06‰ ~+15.34‰ (from isotope fractionation equations of quartz-water and barite-water), δD of -58.2‰ ̄-121.5‰ (from fluid inclusions). It is show through the above-described isotopic study that the oreforming solution was mainly derived from the ancient meteoric water. Oxygen and hydrogen isotopic evolution curves for water and rock system indicated that metallogenic fluids would have boiled while ore-forming materials precipitated. During the hydrothermal minerlization from, circulating groundwater (meteoric water), ore-forming materials in the silicalite formation were remobilized, migrated and re enriched, which contributed to the formation of the present ore bodies.
【Fund】: 国家自然科学基金 中国-奥地利国际合作资助 国家自然科学基金 中国博士后科学基金
【CateGory Index】: P597.2,P618.510.1
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