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Composition of the Earth.

D L Anderson

    Science (New York, N.Y.)
    |January 20, 1989
    PubMed
    Summary
    This summary is machine-generated.

    New solar composition estimates reveal higher iron and calcium levels, impacting cosmic abundance models. This suggests a denser, chemically zoned mantle composition for inner solar system bodies.

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    Area of Science:

    • Planetary Science
    • Cosmochemistry
    • Geophysics

    Background:

    • Previous models of cosmic abundances and nebular composition relied on chondritic values.
    • Solar composition estimates have been updated with new measurements.

    Purpose of the Study:

    • To revise cosmic abundance models based on new solar composition data.
    • To infer the chemical composition and structure of planetary mantles.

    Main Methods:

    • Analysis of new solar composition estimates.
    • Comparison of new estimates with chondritic values.
    • Geophysical data interpretation.

    Main Results:

    • New solar composition shows enrichment in Fe and Ca relative to Mg, Al, and Si.

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  • Fe/Si and Ca/Al atomic ratios are 30-40% higher than chondritic values.
  • Implied mantle composition includes ~15 wt% FeO and more CaMgSi2O6 (diopside).

    • Conclusions:

    • Revised cosmic abundances and nebular composition are necessary.
    • Geophysical data support a dense, FeO-rich lower mantle and diopside-rich transition region.
    • Results favor a chemically zoned mantle with FeO content typical of inner solar system bodies.