• 中国出版政府奖提名奖

    中国百强科技报刊

    湖北出版政府奖

    中国高校百佳科技期刊

    中国最美期刊

    留言板

    尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

    姓名
    邮箱
    手机号码
    标题
    留言内容
    验证码

    大陆俯冲隧道板片-地幔楔界面反向流体交代作用:西阿尔卑斯造山带超高压变质白片岩的地球化学证据

    陈伊翔

    陈伊翔, 2019. 大陆俯冲隧道板片-地幔楔界面反向流体交代作用:西阿尔卑斯造山带超高压变质白片岩的地球化学证据. 地球科学, 44(12): 4057-4063. doi: 10.3799/dqkx.2019.241
    引用本文: 陈伊翔, 2019. 大陆俯冲隧道板片-地幔楔界面反向流体交代作用:西阿尔卑斯造山带超高压变质白片岩的地球化学证据. 地球科学, 44(12): 4057-4063. doi: 10.3799/dqkx.2019.241
    Chen Yixiang, 2019. Reversed Metasomatism at the Slab-Mantle Interface in a Continental Subduction Channel: Geochemical Evidence from the Ultrahigh-Pressure Metamorphic Whiteschist in the Western Alps. Earth Science, 44(12): 4057-4063. doi: 10.3799/dqkx.2019.241
    Citation: Chen Yixiang, 2019. Reversed Metasomatism at the Slab-Mantle Interface in a Continental Subduction Channel: Geochemical Evidence from the Ultrahigh-Pressure Metamorphic Whiteschist in the Western Alps. Earth Science, 44(12): 4057-4063. doi: 10.3799/dqkx.2019.241

    大陆俯冲隧道板片-地幔楔界面反向流体交代作用:西阿尔卑斯造山带超高压变质白片岩的地球化学证据

    doi: 10.3799/dqkx.2019.241
    基金项目: 

    国家“973”计划项目“大陆俯冲带壳幔相互作用” 2015CB856106

    国家自然科学基金面上项目 41473032

    国家自然科学基金面上项目 41622302

    详细信息
      作者简介:

      陈伊翔(1983-), 特任教授, 2016年获得国家自然科学基金委优秀青年科学基金资助.主要研究方向为俯冲带熔/流体活动及其地球化学效应

    • 中图分类号: P597

    Reversed Metasomatism at the Slab-Mantle Interface in a Continental Subduction Channel: Geochemical Evidence from the Ultrahigh-Pressure Metamorphic Whiteschist in the Western Alps

    • 摘要: 前人对深俯冲板片释放熔/流体交代地幔楔形成弧岩浆源区的过程和机制已得到充分认识,然而对地幔楔岩石能否脱水交代深俯冲地壳并不清楚.在对欧洲西阿尔卑斯造山带Dora-Maira地体白片岩的地球化学研究中,首次发现地幔楔交代岩能够脱水反向交代深俯冲地壳岩石,从而极大影响俯冲地壳的地球化学组成.结合白片岩和围岩的全岩地球化学特征以及锆石学结果,查明了白片岩的原岩为S型花岗岩,澄清了关于Dora-Maira白片岩原岩属性的长期争议.在此基础上,发现白片岩中变质锆石相对残留岩浆锆石δ18O值显著降低,指示原岩形成后受到低δ18O变质流体的交代作用.白片岩具有高温岩石中最高的δ26Mg值达0.75‰,显著高于围岩变花岗岩,指示交代流体具有重Mg同位素组成.基于地球主要岩石储库的Mg同位素组成,推测交代流体来自俯冲隧道中富滑石地幔楔蛇纹岩在弧下深度的脱水分解,而这些地幔楔蛇纹岩是新特提斯洋壳在弧前深度变质脱水产生的流体与地幔楔浅部橄榄岩反应形成.这些结果不仅提供了利用Mg-O同位素示踪俯冲隧道中流体来源的新思路,也提供了地幔楔蛇纹岩来源流体反向交代深俯冲地壳岩石的首个典型实例.这种反向交代不仅极大改变了深俯冲地壳的地球化学组成,而且对弧岩浆岩重Mg同位素成因具有重要意义.

       

    • 图  1  西阿尔卑斯造山带Dora-Maira地体白片岩和围岩变花岗岩中残留岩浆锆石U-Pb年龄和Hf-O同位素组成对比

      修改自Chen et al.(2017b)

      Fig.  1.  The comparison of δ18O values, U-Pb ages and εHf(t1) values for the relict magmatic zircons of the metagranite and whiteschist from the Dora-Maira Massif, western Alps

      图  2  西阿尔卑斯Dora-Maira地体白片岩和变花岗岩的Mg同位素组成以及地球主要硅酸盐储库的Mg同位素组成

      修改自Chen et al.(2016)

      Fig.  2.  The Mg isotope composition of whiteschist and metagranite in the Dora-Maira Massif and the major silicate reservoirs of the Earth

      图  3  全岩δ26Mg值与δ18O值、Na2O+CaO、MgO以及CIA的关系

      数据来自Chen et al.(2016);CIA为化学风化指数,指Al2O3/(Al2O3+Na2O+K2O+CaO)的摩尔数比值

      Fig.  3.  Correlations between whole-rock δ26Mg values and δ18O values, Na2O+CaO, MgO and CIA

      图  4  西阿尔卑斯造山带Dora-Maira (DM)地体白片岩形成过程的构造示意

      修改自Chen et al.(2016);图中Europe指欧洲陆块,BR指Brianç onnais地体

      Fig.  4.  The tectonic model for the formation of Dora-Maira whiteschist in the western Alps

    • Bebout, G.E., 2007.Metamorphic Chemical Geodynamics of Subduction Zones.Earth and Planetary Science Letters, 260(3-4):373-393. https://doi.org/10.1016/j.epsl.2007.05.050
      Chen, R.X., Li, H.Y., Zheng, Y.F., et al., 2017a.Crust-Mantle Interaction in a Continental Subduction Channel:Evidence from Orogenic Peridotites in North Qaidam, Northern Tibet.Journal of Petrology, 58(2):191-226. https://doi.org/10.1093/petrology/egx011
      Chen, Y.X., Schertl, H.P., Zheng, Y.F., et al., 2016.Mg-O Isotopes Trace the Origin of Mg-Rich Fluids in the Deeply Subducted Continental Crust of Western Alps.Earth and Planetary Science Letters, 456:157-167. https://doi.org/10.1016/j.epsl.2016.09.010
      Chen, Y.X., Zhou, K., Zheng, Y.F., et al., 2017b.Zircon Geochemical Constraints on the Protolith Nature and Metasomatic Process of the Mg-Rich Whiteschist from the Western Alps.Chemical Geology, 467:177-195. https://doi.org/10.1016/j.chemgeo.2017.08.013
      Chopin, C., 1984.Coesite and Pure Pyrope in High-Grade Blueschists of the Western Alps:A First Record and Some Consequences.Contributions to Mineralogy and Petrology, 86(2):107-118. doi: 10.1007/BF00381838
      Ferrando, S., 2012.Mg-Metasomatism of Metagranitoids from the Alps:Genesis and Possible Tectonic Scenarios.Terra Nova, 24(6):423-436. https://doi.org/10.1111/j.1365-3121.2012.01078.x
      Ferrando, S., Frezzotti, M.L., Petrelli, M., et al., 2009.Metasomatism of Continental Crust during Subduction:The UHP Whiteschists from the Southern Dora-Maira Massif (Italian Western Alps).Journal of Metamorphic Geology, 27(9):739-756. https://doi.org/10.1111/j.1525-1314.2009.00837.x
      Gauthiez-Putallaz, L., Rubatto, D., Hermann, J., 2016.Dating Prograde Fluid Pulses during Subduction by In Situ U-Pb and Oxygen Isotope Analysis.Contributions to Mineralogy and Petrology, 171(2):15. https://doi.org/10.1007/s00410-015-1226-4
      Huang, J., Guo, S., Jin, Q.Z., et al., 2019.Iron and Magnesium Isotopic Compositions of Subduction-Zone Fluids and Implications for Arc Volcanism.Geochimicaet Cosmochimica Acta. https://doi.org/10.1016/j.gca.2019.06.020
      Li, S.G., Yang, W., Ke, S., et al., 2017.Deep Carbon Cycles Constrained by a Large-Scale Mantle Mg Isotope Anomaly in Eastern China.National Science Review, 4(1):111-120. https://doi.org/10.1093/nsr/nww070
      Liao, J., Malusà, M.G., Zhao, L., et al., 2018.Divergent Plate Motion Drives Rapid Exhumation of (Ultra) High Pressure Rocks.Earth and Planetary Science Letters, 491:67-80. https://doi.org/10.1016/j.epsl.2018.03.024
      Schertl, H.P., Schreyer, W., 2008.Geochemistry of Coesite-Bearing "Pyrope Quartzite" and Related Rocks from the Dora-Maira Massif, Western Alps.European Journal of Mineralogy, 20(5):791-809. https://doi.org/10.1127/0935-1221/2008/0020-1862
      Solarino, S., Malusà, M.G., Eva, E., et al., 2018.Mantle Wedge Exhumation beneath the Dora-Maira (U) HP Dome Unravelled by Local Earthquake Tomography (Western Alps).Lithos, 296-299:623-636. https://doi.org/10.1016/j.lithos.2017.11.035
      Teng, F.Z., 2017.Magnesium Isotope Geochemistry.Reviews in Mineralogy and Geochemistry, 82(1):219-287. https://doi.org/10.2138/rmg.2017.82.7
      Teng, F.Z., Hu, Y., Chauvel, C., 2016.Magnesium Isotope Geochemistry in Arc Volcanism.Proceedings of the National Academy of Sciences, 113(26):7082-7087. https://doi.org/10.1073/pnas.1518456113
      Wang, W.Z., Zhou, C., Liu, Y., et al., 2019.Equilibrium Mg Isotope Fractionation among Aqueous Mg2+, Carbonates, Brucite and Lizardite:Insights from First-Principles Molecular Dynamics Simulations.Geochimica et Cosmochimica Acta, 250:117-129. https://doi.org/10.1016/j.gca.2019.01.042
      Zheng, Y.F., 2012.Metamorphic Chemical Geodynamics in Continental Subduction Zones.Chemical Geology, 328:5-48. https://doi.org/10.1016/j.chemgeo.2012.02.005
      Zheng, Y.F., 2019.Subduction Zone Geochemistry.Geoscience Frontiers, 10(4):1223-1254. doi: 10.1016/j.gsf.2019.02.003
      Zheng, Y.F., Chen, Y.X., 2016.Continental versus Oceanic Subduction Zones.National Science Review, 3(4):495-519. https://doi.org/10.1093/nsr/nww049
      Zheng, Y.F., Zhao, Z.F., Chen, Y.X., 2013.Continental Subduction Channel Processes:Plate Interface Interaction during Continental Collision.Chinese Science Bulletin, 58(35):4371-4377. https://doi.org/10.1007/s11434-013-6066-x
    • 加载中
    图(4)
    计量
    • 文章访问数:  3374
    • HTML全文浏览量:  1774
    • PDF下载量:  103
    • 被引次数: 0
    出版历程
    • 收稿日期:  2019-08-19
    • 刊出日期:  2019-12-15

    目录

      /

      返回文章
      返回