Preliminary studies of fluid inclusions in Damoqujia gold deposit along Zhaoping fault zone,Shandong province, China

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• 出版年：2007
• 作者：YANG LiQiang；DENG Jun；ZHANG Jing；WANG QingFei GAO BangFei；ZHOU YingHua GUO ChunYing；JIANG ShaoQing
• 单位1：State Key Laboratory of Geological Processes and Mineral Resources,China University of Ceosciences
• 单位2：Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education,China University of Geosciences
• 语种：英文
• 作者关键词：Damoqujia gold ore deposit；Fluid inclusion；Zhaoping Fault Zone；Jiaodong gold province；China
• 起始页：153
• 总页数：8
• 刊名：岩石学报
• 是否内版：否
• 刊频：月刊
• 创刊时间：1985
• 主办单位：中国矿物岩石地球化学学会；中国科学院地质与地球物理研究所
• 电子信箱：Ihzd@ public.tpt.tj.cn
• 卷：23
• 期：1
• 期刊索取号：P350.66357

摘要

The Damoqujia gold deposit, discovered recently and located in the north of Zhaoping fault zone, is a large altered rocktype deposit. In this paper, we report the preliminary research results of the fluid inclusions and discuss its metallogenic implications.The homogenization temperatures of fluid inclusions fall into four ranges: 310～350℃,230～270℃,160～200℃ and110～150℃；corresponding to the four stages of hydrothermal ore-forming processes: coarse grain pyrite-milk white quartz stage (Ⅰ),smoky grayAu-bearing quartz-fine grain pyrite stage (Ⅱ),Au-bearing polymetallic sulfide-quLutz stage (Ⅲ),and quartz-carbonate stage (Ⅳ).Ore-forming fluid is with low salinity and low density, ranging from 1.4 Wt_NaCl%to 13.6Wt_NaCl% and from 0.48g/cm³ to1.03g/cm³respectively. The inclusions are dominated by H₂O and CO₂ in gaseous compositions, and Na⁺ and K⁺in positive ions, SO²₄^-and Cl-in negative ions of liquid compositions. Au-S complex is the major form for transportation of gold. The pressure varied from 260MPa to340MPa during the formation of CO**2-bearing inclusions at the early mineralization；the fluids are rich in SO²₄^-and Na⁺. The pressureis 26-49r10⁵ Pa during the formation of the aqueous salt inclusions in late mineralization, the inclusions are rich in Cl^-(F^-),Na⁺.δ¹⁸O_qurrtz is 10.64～12.68‰,and the corresponding δ¹⁸ O_H2O and δD is -5.44～6.47‰and-95.52～-106.48‰。respectively. Based on the studies about compositions and hydrogen and oxygen isotopes of inclusions, it is evidenced that ore-formingfluid is magmatic hydrothermal fluid in early period, but affected by meteoric water in late.