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Showing 1–7 of 7 results
Advanced filters: Author: John W. Hernlund Clear advanced filters

  • The boundary between Earth’s rigid lithosphere and ductile asthenosphere is marked by a seismic discontinuity. Laboratory experiments on basaltic magmas show that melts should pond at pressures that correspond to the lithosphere–asthenosphere boundary. Thus, magma ponding could explain the observed seismic discontinuity.

    • Tatsuya Sakamaki
    • Akio Suzuki
    • Maxim D. Ballmer
    Research
    Nature Geoscience
    Volume: 6, P: 1041-1044

  • Seismic data are inconsistent with a compositionally homogenous lower mantle. Simulations show that viscosity variation with depth in Earth’s early mantle may have prevented efficient mixing and allowed ancient mantle domains to persist.

    • Maxim D. Ballmer
    • Christine Houser
    • Kei Hirose
    Research
    Nature Geoscience
    Volume: 10, P: 236-240

  • This study identifies the predicted seismic expression of the high-to-low iron spin crossover in the deep Earth mineral ferropericlase. A depth-dependent signal is detected in the fastest and slowest regions, related to lateral temperature variations, of several global seismic tomography models.

    • Grace E. Shephard
    • Christine Houser
    • Renata M. Wentzcovitch
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-11

  • Based on diamond-anvil cell experiments and cutting-edge secondary ion mass spectrometry analyses, the authors here show that hydrogen may be an important constituent in the Earth’s core and also in the metallic cores of any terrestrial planet or moon having a mass in excess of 10% of the Earth.

    • Shoh Tagawa
    • Naoya Sakamoto
    • Hisayoshi Yurimoto
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • Emerging evidence for threefold higher heat flow across the core–mantle boundary prompts a re-evaluation of the role of thermal plumes in geodynamics and the thermal history of the Earth's core and lower mantle.

    • Thorne Lay
    • John Hernlund
    • Bruce A. Buffett
    Reviews
    Nature Geoscience
    Volume: 1, P: 25-32