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Dynamic compression of Earth materials.

T J Ahrens

    Science (New York, N.Y.)
    |March 7, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Shock wave experiments reveal phase changes in Earth materials, influencing models of the planet's deep interior. These findings provide insights into the composition of the lower mantle and the metallic outer core.

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    Area of Science:

    • Geophysics
    • Materials Science
    • Mineral Physics

    Background:

    • Shock wave techniques are crucial for studying material properties under extreme pressures.
    • Understanding pressure-density relations is vital for geophysical models of Earth's interior.

    Purpose of the Study:

    • To investigate the pressure-density behavior of metals, silicates, and oxides.
    • To determine the influence of shock-induced phase changes on material compression.
    • To infer the composition of Earth's lower mantle and outer core.

    Main Methods:

    • Utilizing shock wave experiments to generate high-pressure conditions.
    • Analyzing compression behavior of geophysically relevant materials like iron, wüstite, calcium oxide, and forsterite.
    • Interpreting shock wave data to model phase transitions and density variations.

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    Main Results:

    • Major shock-induced phase changes significantly affect compression behavior below 1 million bars for key minerals.
    • The lower mantle exhibits a slightly higher density than predicted by an olivine-rich model.
    • The outer core's density is approximately 10% less than pure iron, suggesting the presence of lighter elements.

    Conclusions:

    • Shock wave data provide critical constraints on the composition of Earth's deep interior.
    • The Earth's core likely contains significant amounts of sulfur (9-12% by weight) or oxygen (around 8% by weight).
    • These findings refine geophysical models of planetary interiors and material behavior under extreme conditions.