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首页> 外文期刊>Journal of Asian earth sciences >Controls of mantle source and condition of melt extraction on generation of the picritic lavas from the Emeishan large igneous province, SW China
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Controls of mantle source and condition of melt extraction on generation of the picritic lavas from the Emeishan large igneous province, SW China

机译：SW中国峨眉山大火植物的皮肤熔岩熔体源和熔体萃取条件的控制

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摘要

Like many continental flood basalt (CFB) provinces in the world, the source mantle compositions and melting conditions for generation of the Emeishan CFB are highly debated. We have carried out an integrated Sr-Nd-O-Mg isotopic study of the Emeishan picritic lavas to evaluate possible effects of mantle heterogeneity on the magma composition. Moreover, we have used PRIMELT3 (Herzberg and Asimow, 2015) to calculate the primary magma compositions and melting conditions for these picritic lavas. Picrites from Maoniuping, Tanglanghe and Wuguijing exhibit depleted Sr-Nd isotopic compositions (Sr-87/Sr-86(i) = 0.7038-0.7050; epsilon(Nd) = 0.27-3.89), normal mantle-like delta Mg-26 (-0.27 to -0.2 parts per thousand) and delta O-18 (5.0-5.4 parts per thousand), which can be explained by partial melting of plume materials with negligible contribution of sedimentary carbonates. The Wulongba picrites are characterized by depleted Sr-Nd isotopic compositions (Sr-87/(86)Sri = 0.7041-0.7045; epsilon(Nd) = 2.57-2.85), slightly lower delta Mg-26 (-0.36 to -0.23 parts per thousand) and higher delta O-18 (5.6-5.7 parts per thousand), which were attributed to involvement of minor sedimentary carbonates (magnesite) in their mantle source. The calculated mantle potential temperatures for the Emeishan picrites range from 1516 to 1596 degrees C. The initial melting pressures range from 4 to 5 GPa. The final melting pressures for the Wulongba picrites (2-3 GPa) are lower than those for the Tanglanghe, Maoniuping and Wuguijing picrites (3 GPa). This suggests that the Wulongba picrites were generated in shallower garnet-spinel transition zone of the upper mantle. Picrites from other three localities are entirely generated in garnet stability field of the upper mantle.
机译：与世界上许多大陆洪座（CFB）省份一样，源地幔组成和峨眉山CFB的熔化条件是高度辩论的。我们已经进行了emeishan Picritic Lavas的综合SR-ND-O-Mg同位素研究，以评估搭腔异质性在岩浆组合物上的可能影响。此外，我们使用Primelt3（Herzberg和Asimow，2015）来计算这些皮质系熔岩的主要岩浆组合物和熔化条件。来自Maoniuping，Tanglanghe和Wuguicijing的Picrites表现出耗尽的SR-ND同位素组合物（SR-87 / SR-86（i）= 0.7038-0.7050; epsilon（Nd）= 0.27-3.89），正常的地幔样Delta mg-26（ - 0.27至-0.2份百分之一，Delta O-18（5.0-5.4份每千份），可以通过羽毛材料的部分熔化来解释，沉积碳酸盐含量可忽略不计。 Wulongba Picrites的特征在于SR-ND同位素组合物（SR-87 /（86）SRI = 0.7041-0.7045;ε（ND）= 2.57-2.85），略低于Delta Mg-26（-0.36至-0.23份千）和更高的Delta O-18（5.6-5.7份）（5.6-5.7份），归因于次要沉积碳酸盐（菱镁矿）在其地幔源中的参与。所计算的峨眉山纤维岩的地幔势温度为1516至1596℃。初始熔化压力范围为4至5GPa。 Wulongba Picrites（2-3 GPA）的最终熔化压力低于Tanglanghe，Maoniuping和Wuguijing Picrites（> 3 GPA）。这表明武龙巴皮特斯在上部地幔的浅石榴石过渡区中产生。来自其他三个地方的屠宰场完全在上部地幔的石榴石稳定场中产生。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第11期|104534.1-104534.15|共15页
  • 作者

    Yu Song-Yue; Chen Lie-Meng; Lan Jiang-Bo; He Yong-Sheng; Chen Qi; Song Xie-Yan;

  • 作者单位

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China;

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China;

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    ELIP; Picrite; Magnesium isotope; Primary magma; Mantle potential temperature; Melting condition;

    机译：elip;picrite;镁同位素;初级岩浆;地幔潜在温度;熔化条件;

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