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首页> 外文会议>12th international nickel symposium >Variations of lithophile-siderophile elements and Sr-Nd isotopes in the Emeishan picrites and basalts
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Variations of lithophile-siderophile elements and Sr-Nd isotopes in the Emeishan picrites and basalts

机译：峨眉山苦荞岩和玄武岩中亲石-亲石元素和Sr-Nd同位素的变化

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Picrites from the Emeishan large igneous province (ELIP) may be divided into those that show LREE enrichment and those that are characterized by LREE depletion.All picrite types have low 87Sr/86Sr ratios (<0.7057) but variable εNd,suggesting that crustal contamination has been negligible,and source mantle variation is responsible for their chemical diversity.In contrast,coeval basalts show strong signatures of crustal contamination.Calculated mantle potential temperatures are 240oC higher than that in ambient mantle,supporting a plume origin for the province.A depleted plume source and ancient sub-continental lithospheric mantle are inferred to be the most important end-members involved in the generation of the Emeishan picrites.Pt and Pd values of the picrites show no evidence of depletion;Pt/Pd ratios are highly variable and show no correlation with picrite type.PGE analyses of both picrites and coeval basalts confirm that Os,Ir,and Ru (IPGE) have behaved compatibly and Pt,Pd,and Rh have behaved incompatibly during Cr-spinel and olivine crystallization.PGE-depleted basalts are present in the ELIP,but the most fractionated basalts tend not to show significant depletion in Pt and Pd.This suggests that fractional crystallization alone was not sufficient to induce sulfide saturation in the magmas,and that contamination involving crustal sulfur was an important driving mechanism.Significant depletion of Ir relative to Ru in some of the basalts regardless of the sulfide saturation state of the parental magma suggests that Ir-dominant alloys segregated prior to magma eruption.Depletions of IPGE relative to Pt and Pd in the Emeishan picrites are consistent with the notion that IPGE alloys are stable in the mantle during partial melting.This presentation is based on a recent paper by Li et al.(2012).
机译：峨眉山大火成岩省（ELIP）的微粉岩可分为表现为LREE富集和以LREE耗尽为特征的微粉岩。所有微粉岩类型的低87Sr / 86Sr比（<0.7057）但εNd可变，暗示地壳污染具有相形之下，近代玄武岩表现出强烈的地壳污染特征。计算出的地幔潜在温度比周围地幔高240oC，这为该省的羽流来源提供了支持。推测峨眉山pic岩的成因最重要的最终成员是烃源岩和古代次大陆岩石圈地幔.Pt和Pd值没有显示出耗尽的迹象; Pt / Pd比率高度可变且没有显示出对微粉矿和近代玄武岩的PGE分析证实Os，Ir和Ru（IPGE）的行为与Pt，Pd和Rh的行为相容在EL-IP中存在PGE贫化的玄武岩，但大部分分馏的玄武岩在Pt和Pd中没有显示出明显的贫化现象，这表明仅分馏结晶不足以引起硫化物饱和。不论母岩浆的硫化物饱和状态如何，某些玄武岩中Ir相对于Ru的显着耗竭都表明在岩浆喷发之前偏析了Ir占优势的合金。峨眉山pic岩中IPGE相对于Pt和Pd的损耗与IPGE合金在部分熔融过程中在地幔中是稳定的这一观点是一致的。本报告基于Li等人（2012年）的最新论文。

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  • 会议地点 Guiyang(CN)
  • 作者

    C.Li; Y.Tao; L.Qi; E.M.Ripley;

  • 作者单位

    State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002,China;

    State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002,China;

    State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002,China;

    Indiana University,Bloomington,IN 47405,USA;

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  • 正文语种 eng
  • 中图分类 P578.24;
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