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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
Structure and dynamics of Earth's lower mantle
Edward J Garnero1, Allen K McNamara
1School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287, USA. garnero@asu.edu
Science (New York, N.Y.)
|May 3, 2008
Summary
Earth's lower mantle dynamics are crucial for planetary evolution. Seismic and mineral physics data reveal deep mantle structures, including distinct provinces and a perovskite to post-perovskite phase transition.
Area of Science:
- Geophysics
- Mineral Physics
- Planetary Science
Background:
- Processes in Earth's lower mantle significantly influence planetary evolution.
- Understanding these processes requires integrating seismic and mineral physics data.
- Deep mantle structures, like large low-shear-velocity provinces, suggest chemically distinct material.
Purpose of the Study:
- To synthesize recent seismic and mineral physics discoveries into a geodynamically consistent model of Earth's lower mantle.
- To interpret deep mantle structures and their implications for planetary evolution.
Main Methods:
- Analysis of high-resolution seismological studies.
- Integration of mineral physics data on phase transitions.
- Geodynamic modeling to assess feasibility of interpretations.
Main Results:
- Identification of two large, antipodal low-shear-velocity provinces likely composed of denser, chemically distinct material.
- Observation of seismic velocity discontinuities consistent with the perovskite to post-perovskite phase transition in the deepest mantle.
- Potential identification of deep magma chambers through pockets of ultralow seismic velocities.
Conclusions:
- Earth's lower mantle exhibits complex structures and chemical heterogeneity.
- The perovskite to post-perovskite transition is a key feature of the deep mantle.
- Further research into deep mantle structures may reveal insights into processes like magma chambers.
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