| 胶东地区金矿床流体包裹体的He、Ar同位素组成及成矿流体来源示踪 |
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| 引用本文： | 张连昌,沈远超,等.胶东地区金矿床流体包裹体的He、Ar同位素组成及成矿流体来源示踪[J].岩石学报,2002,18(4):559-565. |
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| 作者姓名： | 张连昌 沈远超 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 中国科学院创新工程重大项目 ( KZCX1 - Y- 0 3)，国家“973”项目“大陆深俯冲作用”( G1 9990 7550 4 )资助 |
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| 摘 要： | 关于胶东地区金矿床成因，多年来一直存在较大的争议。代表性金矿床中黄铁矿流体包裹体的He-Ar组成表明，胶东金床黄铁矿流体包裹体的^3He/^4He比值为0．43－2．36R／Ra。该值可分为两组：一组如蓬家夼金矿和发云夼金矿^3He/^4He比值＜1．0R／Ra；另一组如邓格庄和焦家金矿^3He/^4He比值＞1．0R／Ra。蓬家夼－发云夼金矿成矿流体的^40Ar/^36Ar比值为393－310，比较接近于大气氩的同位素组成（^40Ar/^36Ar=295.5），而焦家金矿成矿流体的^40Ar/^36Ar比值为500－1148。He-Ar同位素系统显示了蓬家夼－发云夼金矿成矿流体来源以大气降水为主，邓格庄、焦家金矿成矿流体来源以地幔流体为主。进一步研究表明，胶东金矿成矿流体H－O和He-Ar同位素系统对流体来源的示踪具有一致性。
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| 关 键 词： | 成矿流体 He－Ar同位素 地幔流体 金矿床 胶东地区 大气降水 |
| 文章编号： | 1000-0569/2002/018(04)-0559-65 |
| 修稿时间： | 2001年6月14日 |
Helium and argon isotopic compositions of fluid inclusions and tracing to the source of ore-forming fluids for Jiaodong gold deposits |
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| ZHANG LianChang,SHEN YuanChao,LI HouMin,ZENG QingDong,LI GuangMing and LIU T ieBing Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China.Helium and argon isotopic compositions of fluid inclusions and tracing to the source of ore-forming fluids for Jiaodong gold deposits[J].Acta Petrologica Sinica,2002,18(4):559-565. |
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| Authors: | ZHANG LianChang SHEN YuanChao LI HouMin ZENG QingDong LI GuangMing and LIU T ieBing Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China |
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| Abstract: | The Jiaodong gold deposits have attracted the attention of many geologists and t heir metallogenesis has long been in dispute. The authors choose pyrite samples from some gold deposits in Jiaodong area to analyze their helium and argon isot opic compositions of fluid inclusions. The analytical results show that 3 He/ 4 He ratios of Jiaodong gold deposits are 0.43~2.36 R/Ra, and 3 He/ 4 He <1.0 R/Ra for Pengjiakuang and Fayunkuang gold deposit , 3 He/ 4 He >1.0 R/Ra for Denggezhuang and Jiaojia gold deposi t. 40 Ar/ 36 Ar ratios of ore-forming fluids are 393~310 for P engjiakuang and Fayunkuang gold dcposits, similar to the isotopic components of atmosphere helium ( 40 Ar/ 36 Ar=295.5); 40 Ar/ 36 Ar ratios of Jiaojia and Denggezhuang gold deposits are 500~1148. The compos itions of He-Ar isotopic system suggest that the source of ore-forming fluids is mainly meteoric water for Pengjiakuang and Fayunkuang gold deposits, and mant le fluids for Denggezhuang and Jiaojia gold deposits. The relation between H-O and He-Ar isotopic systems of ore-forming fluids show consistency in Jiaodong gold deposits. |
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| Keywords: | Ore-forming fluids He-Ar isotope Mantle fluids Gold ore deposits Jiaodong |
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