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Mercury: surface composition from the reflection spectrum.

T B McCord, J B Adams

    Science (New York, N.Y.)
    |November 17, 1972
    PubMed
    Summary
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    Mercury's surface reflectivity closely matches lunar regions, suggesting a similar soil composition. This soil is likely rich in dark glasses containing high iron and titanium, with pyroxene as the dominant mineral.

    Area of Science:

    • Planetary Science
    • Spectroscopy
    • Geology

    Background:

    • Mercury's surface composition remains incompletely understood.
    • Previous studies suggest similarities between Mercury and the Moon.

    Purpose of the Study:

    • To measure the reflection spectrum of Mercury's integral disk.
    • To compare Mercury's spectral properties with lunar regions.

    Main Methods:

    • Reflection spectroscopy was performed on Mercury's integral disk.
    • Spectral data were analyzed for reflectivity and absorption features.

    Main Results:

    • A constant positive slope was observed in Mercury's reflection spectrum from 0.32 to 1.05 micrometers.
    • Absorption features were noted in the infrared spectrum.

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  • The reflectivity curve closely matched that of lunar upland and mare regions.

    • Conclusions:

    • Mercury's surface is likely covered with a lunar-like soil.
    • This soil is rich in dark glasses with high iron and titanium content.
    • Pyroxene is the probable dominant mafic mineral on Mercury's surface.