| 胶东夏甸金矿成矿流体及成矿物质来源:H-O、He-Ar、Sr-Nd-Pb同位素证据 |
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| 引用本文： | 杜佛光,姜耀辉,青龙,倪春雨.胶东夏甸金矿成矿流体及成矿物质来源:H-O、He-Ar、Sr-Nd-Pb同位素证据[J].高校地质学报,2019,25(5):686. |
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| 作者姓名： | 杜佛光 姜耀辉 青龙 倪春雨 |
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| 作者单位： | 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023;内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023;内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023;内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023 |
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| 摘 要： | 夏甸金矿是胶东金矿集区中一处大型焦家式矿床。文章在详尽的岩相学和矿相学研究基础上，对该矿床进一步开展
了H-O同位素并首次开展了He-Ar和Sr-Nd-Pb同位素示踪研究，为该矿床成矿流体及成矿物质来源提供了新的制约。石
英中流体包裹体的H-O同位素（δDV-SMOW=-102.3‰~-93.9‰，δ18OH2O=-0.2‰~1.6‰） 揭示出成矿流体主要为富集地幔流体，
并有少许大气降水加入；黄铁矿中He-Ar同位素3He/4/He=0.58×10? 6~1.90×10? 6 （0.42~1.36 Ra），40Ar/36Ar=724.7~1358.4]同样
表明成矿流体以富集地幔流体为主导；矿石及蚀变岩的Nd-Pb同位素既不同于围岩花岗岩，也不同于基底变质岩，与胶东
地区中生代软流圈地幔起源的玄武岩也相差甚远，而与胶东地区中生代富集岩石圈地幔起源的煌斑岩相一致，但它们的初
始87Sr/86Sr比值明显高于煌斑岩，甚至高于围岩花岗岩。Sr-Nd-Pb同位素特征表明成矿流体及成矿物质来源于富集岩石圈地
幔，并在其上升过程中与基底变质岩发生了相互作用。
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| 关 键 词： | 夏甸金矿 H-O同位素 He-Ar同位素 Sr-Nd-Pb同位素 成矿流体 成矿物质 |
H-O,He-Ar and Sr-Nd-Pb Isotopic Constraints on the Sources of Ore-Forming Fluids and Ore-Forming Materials in the Xiadian Gold Deposit,Jiaodong |
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| DU Foguang,JIANG Yaohui,QING Long,NI Chunyu.H-O,He-Ar and Sr-Nd-Pb Isotopic Constraints on the Sources of Ore-Forming Fluids and Ore-Forming Materials in the Xiadian Gold Deposit,Jiaodong[J].Geological Journal of China Universities,2019,25(5):686. |
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| Authors: | DU Foguang JIANG Yaohui QING Long NI Chunyu |
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| Abstract: | The Xiadian gold deposit is a large Jiaojia-type gold deposit in Jiaodong district. On the basis of detailed petrographic and
mineralogical studies, we carried out the H-O isotopes and the first He-Ar and Sr-Nd-Pb isotope tracing studies of the Xiadian gold
deposit, which furnish the new constrains on the source of ore-forming fluids and materials. H-O isotopes of fluid inclusions in quartz
（δDV-SMOW=-102.3‰~-93.9‰ ，δ18OH2O=-0.2‰~1.6‰）reveal that the ore-forming fluids is mainly composed of enriched mantlederivedfluidwithinvolvedalittlemeteoricwater.
He-Arisotopeofpyrite3He/4/He=0.58×10?6~1.90×10?6(0.42~1.36Ra),40Ar/36Ar=724.7~
1358.4] also indicates that the ore-forming fluids are dominant by the enriched mantle-derived fluid. Nd-Pb isotopes of ore and altered
rocks are different either from those of the surrounding granites and the basement metamorphic rocks or from those of Mesozoic
asthenosphere-derived basalts. Instead, they are consistent with those of Mesozoic lithospheric mantle-derived lamprophyres in the
Jiaodong district. However, their initial 87Sr/86Sr ratios are higher than those of the lamprophyres and even higher than the surrounding
granites. The Sr-Nd-Pb isotopic characteristics indicate that the ore-forming fluids and ore-forming materials were derived from the
enriched lithospheric mantle with subsequent interacted with the basement metamorphic rocks during the ascending process. |
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| Keywords: | Xiadian gold deposit H-O isotope He-Ar isotope Sr-Nd-Pb isotope ore-forming fluid ore-forming material |
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