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Related Experiment Videos

Deep mantle structure and the postperovskite phase transition.

D Helmberger1, T Lay, S Ni

  • 1Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA. helm@gps.caltech.edu

Proceedings of the National Academy of Sciences of the United States of America
|October 12, 2005
PubMed
Summary

The Earth's deep mantle exhibits complex structures, including ultralow velocity zones (ULVZs) caused by partial melts. These deep mantle features significantly influence core heat transport and the geodynamo, affecting Earth's magnetic field.

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Area of Science:

  • Geophysics
  • Seismology
  • Mineral Physics

Background:

  • The lowermost mantle is known to be seismically complex.
  • Observed seismic phases reveal sharp discontinuities, anisotropy, vertical structural contrasts, and ultralow velocity zones (ULVZs).

Purpose of the Study:

  • To understand the geodynamic and mineral physics origins of deep mantle complexity.
  • To explore the implications of mantle heterogeneity on core processes and the geodynamo.

Main Methods:

  • Analysis of seismic phases to model deep mantle structures.
  • Integration of geodynamic and mineral physics principles to interpret seismic observations.

Main Results:

  • Ultralow velocity zones (ULVZs) are attributed to dense partial melts.

Related Experiment Videos

  • A postperovskite phase transition likely causes regional layering and chemical variations.
  • Deep mantle heterogeneity significantly impacts core heat transport.

    • Conclusions:

    • Deep mantle structures, including ULVZs and layering, are explained by geodynamics and mineral physics.
    • Mantle heterogeneity plays a crucial role in the evolution of Earth's magnetic field and polarity reversals.