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Nickel and helium evidence for melt above the core-mantle boundary

机译：镍和氦在芯-幔边界上方融化的证据

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摘要

Claude Herzberg和本文的共同作者研究了来自巴芬岛、西格陵兰、翁通爪哇高原、高格纳岛和加拉帕戈斯群岛中的菲尔南迪岛的熔岩。这些地方的玄武岩(被认为来自深层地幔--地幔柱)被发现是从橄榄岩形成的，其中的镍含量比形成海底山脉所在地方的现代海洋地壳的橄榄岩约高20％。他们提出，这种镍含量丰富的地幔柱可能反映了一个由地核一地幔相互作用形成的、脱气程度较小的、富含镍的来源。%High ~3He/~4He ratios in some basalts have generally been interpreted as originating in an incompletely degassed lower-mantle source. This helium source may have been isolated at the core-mantle boundary region since Earth's accretion. Alternatively, it may have taken part in whole-mantle convection and crust production over the age of the Earth; if so, it is now either a primitive refugium at the core-mantle boundary or is distributed throughout the lower mantle. Here we constrain the problem using lavas from Baffin Island, West Greenland, the Ontong Java Plateau, Isla Gorgona and Fernandina (Galapagos). Olivine phe-nocryst compositions show that these lavas originated from a peri-dotite source that was about 20 per cent higher in nickel content than in the modern mid-ocean-ridge basalt source. Where data are available, these lavas also have high ~3He/~4He. We propose that a less-degassed nickel-rich source formed by core-mantle interaction during the crystallization of a melt-rich layer or basal magma ocean, and that this source continues to be sampled by mantle plumes. The spatial distribution of this source may be constrained by nickel partitioning experiments at the pressures of the core-mantle boundary.
机译：Claude Herzberg和本文的共同作者研究了来自巴芬岛、西格陵兰、翁通爪哇高原、高格纳岛和加拉帕戈斯群岛中的菲尔南迪岛的熔岩。这些地方的玄武岩(被认为来自深层地幔--地幔柱)被发现是从橄榄岩形成的，其中的镍含量比形成海底山脉所在地方的现代海洋地壳的橄榄岩约高20％。他们提出，这种镍含量丰富的地幔柱可能反映了一个由地核一地幔相互作用形成的、脱气程度较小的、富含镍的来源。%High ~3He/~4He ratios in some basalts have generally been interpreted as originating in an incompletely degassed lower-mantle source. This helium source may have been isolated at the core-mantle boundary region since Earth's accretion. Alternatively, it may have taken part in whole-mantle convection and crust production over the age of the Earth; if so, it is now either a primitive refugium at the core-mantle boundary or is distributed throughout the lower mantle. Here we constrain the problem using lavas from Baffin Island, West Greenland, the Ontong Java Plateau, Isla Gorgona and Fernandina (Galapagos). Olivine phe-nocryst compositions show that these lavas originated from a peri-dotite source that was about 20 per cent higher in nickel content than in the modern mid-ocean-ridge basalt source. Where data are available, these lavas also have high ~3He/~4He. We propose that a less-degassed nickel-rich source formed by core-mantle interaction during the crystallization of a melt-rich layer or basal magma ocean, and that this source continues to be sampled by mantle plumes. The spatial distribution of this source may be constrained by nickel partitioning experiments at the pressures of the core-mantle boundary.

著录项

  • 来源
    《Nature》 |2013年第7432期|393-397qt3|共6页
  • 作者

    Claude Herzberg; Paul D. Asimow; Dmitri A. Ionov; Chris Vidito; Matthew G. Jackson; Dennis Geist;

  • 作者单位

    Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854-8066, USA;

    Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA;

    DepartementdeGeologie,UniversiteJ.Monnet (member of PRESUniversitedeLyon), 23 rue P. Michelon,42023Saint-EtienneCedex 2, France,Laboratoire Magmas et Volcans, CNRS UMR 6524,42023 Saint Etienne, France;

    Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854-8066, USA;

    Department of Earth and Environment, Boston University, 685 Commonwealth Avenue, Boston, Massachusetts 02215, USA;

    Department of Geological Sciences, University of Idaho 3022, Moscow, Idaho 83844, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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