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阿尔泰东南缘布尔根地区造山带型金矿床硫铅同位素特征及地质意义
Geochemical features of sulfur and lead isotopes and their geological implications for orogenic gold deposits in Buergen area,southeastern margin of the Altay Mountain.
【Author】 ZENG QingDong,LIU TieBing,SHEN YuanChao,LI GuangMing and SHEN Ping Key laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
【机构】 中国科学院地质与地球物理研究所中国科学院矿产资源研究重点实验室；
【摘要】 阿尔泰东南缘布尔根地区造山带型金矿床受韧性剪切带控制,有两种矿化类型:一为石英脉型,另一种为糜棱岩型。糜棱岩型金矿硫化物的δ34S值变化于-10.009‰～-2.819‰,平均值为-5.29‰,石英脉型金矿硫化物的δ34S值变化于-0.062‰～-1.688‰,平均值为-1.0575‰。布尔根地区金矿床的金属硫化物样品具有较窄的206Pb/204Pb比值,变化于17.71～18.35;相对较高的207Pb/204Pb比值为15.31～15.64和208Pb/204Pb比值为37.13～38.07,铅同位素分析结果表明,该区金矿床成矿物质铅来源于地幔及下地壳。硫、铅同位素特征反映了布尔根地区金矿床成矿物质具有多来源特征。
【Abstract】 The orogenic gold deposits in Buergen region in southeastern margin of the Altay Mountain are controlled by ductile shear zone,and two gold ore subtypes（quartz vein type and mylonite type） are defined.Theδ34S values of pyrite within the ores of the mylonite gold deposit change from -10.009‰～-2.81‰,with an average of -5.29‰;Theδ34S values of sulfides within the ores of the quartz vein gold deposit change from -0.062‰～-1.688‰,with an average of -1.0575‰.Theδ34S values of sulfides from quartz vein gold ores are higher than those in mylonite gold ores,and they are similar to values in meteorites.The 206Pb/204Pb,207Pb/ 204Pb and 208Pb/204Pb of sulfide ores range within 17.71～18.35,15.31～15.64,and 37.13～38.07,respectively.These sulfur and lead compositions indicate that the ore-forming materials originated from mantle and lower crust,it indicates that a feature of multiple resources of the ore-forming materials.
【Key words】 Orogenic gold deposit； Sulfur and lead isotopes； Southeastern margin of Altay Mountain； Xinjiang；
- 【会议录名称】 中国科学院地质与地球物理研究所2007学术论文汇编(第三卷)
- 【会议名称】中国科学院地质与地球物理研究所2007学术年会
- 【会议时间】2008-01-01
- 【会议地点】中国北京
- 【分类号】P597.2
- 【主办单位】中国科学院地质与地球物理研究所(Institute of Geology and Geophysics,Chinese Academy of Sciences)