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Evidence for a basalt-free surface on Mercury and implications for internal heat.

Microwave and mid-infrared observations reveal that Mercury's surface contains less FeO + TiO2 and at least as much feldspar as the lunar highlands. The results are compatible with the high albedo (brightness) of Mercury's surface at visible wavelengths in suggesting a rock and soil composition that is devoid of basalt, the primary differentiate of terrestrial mantles. The occurrence of a basalt-free, highly differentiated crust is in accord with recent models of the planet's thermal evolution and suggests that Mercury has retained a hot interior as a result of a combination of inefficient mantle convection and minimal volcanic heat loss.[1]

References

  1. Evidence for a basalt-free surface on Mercury and implications for internal heat. Jeanloz, R., Mitchell, D.L., Sprague, A.L., de Pater, I. Science (1995) [Pubmed]
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