Mercury - Absence of crystalline Fe(2+) in the regolith

Details Mercury - Absence of crystalline Fe(2+) in the regolith Mercury - Absence of crystalline Fe(2+) in the regolith

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..133v&link_type=abstract

Icarus (ISSN 0019-1035), vol. 64, Oct. 1985, p. 133-138. Research supported by the Observatorio Interamericano de Cerro Tololo.

Astronomy and Astrophysics

Astronomy

50

Iron, Mercury (Planet), Planetary Composition, Regolith, Spectral Reflectance, Astronomical Spectroscopy, Temperature Effects, Water, Mercury (Planet), Crystalline Rocks, Reflectance, Surface, Absorption, Plains, Spectrography, Regolith, Water, Orthopyroxene, Reduction, Iron, Spectra, Metal, Micrometeoroids, Bombardment, Agglutinates, Composition

Scientific paper

Reflectance spectra of terrain on Mercury containing both smooth plains and intercrater plains were obtained using a charge-coupled device spectrograph on 24 November 1984. The composite spectrum covers the 0.53-to 1.02-μm spectral range with a resolution of 17 Å. Absorption features due to telluric H2O absorption are clearly mapped around 0.73, 0.82, and 0.93 μm. No evidence exists in the new spectrum for the proposed orthopyroxene absorption centered near 0.9 μm seen in older spectra of this terrain. The surface material is probably highly reduced, with any iron present in metallic form. Based upon the new spectrum, a history of heavy micrometeoroid bombardment of the Mercurian surface is suggested, resulting in a surface regolith primarily comprised of agglutinates.

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