Major-element abundances on the surface of mercury: Results from the messenger gamma-ray spectrometer

Larry G. Evans, Patrick N. Peplowski, Edgar A. Rhodes, David J. Lawrence, Timothy J. McCoy, Larry R. Nittler, Sean C. Solomon, Ann L. Sprague, Karen R. Stockstill-Cahill, Richard D. Starr, Shoshana Z. Weider, William V. Boynton, David K. Hamara, John O. Goldsten

Research output: Contribution to journalArticle

108 Scopus citations

Abstract

Orbital gamma-ray measurements obtained by the MESSENGER spacecraft have been analyzed to determine the abundances of the major elements Al, Ca, S, Fe, and Na on the surface of Mercury. The Si abundance was determined and used to normalize those of the other reported elements. The Na analysis provides the first abundance estimate of 2.90.1wt% for this element on Mercury's surface. The other elemental results (S/Si=0.0920.015, Ca/Si=0.240.05, and Fe/Si=0.0770.013) are consistent with those previously obtained by the MESSENGER X-Ray Spectrometer, including the high sulfur and low iron abundances. Because of different sampling depths for the two techniques, this agreement indicates that Mercury's regolith is, on average, homogenous to a depth of tens of centimeters. The elemental results from gamma-ray and X-ray spectrometry are most consistent with petrologic models suggesting that Mercury's surface is dominated by Mg-rich silicates. We also compare the results with those obtained during the MESSENGER flybys and with ground-based observations of Mercury's surface and exosphere.

Original languageEnglish (US)
Article numberE00L07
JournalJournal of Geophysical Research E: Planets
Volume117
Issue number11
DOIs
StatePublished - Nov 22 2012

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Fingerprint Dive into the research topics of 'Major-element abundances on the surface of mercury: Results from the messenger gamma-ray spectrometer'. Together they form a unique fingerprint.

  • Cite this

    Evans, L. G., Peplowski, P. N., Rhodes, E. A., Lawrence, D. J., McCoy, T. J., Nittler, L. R., Solomon, S. C., Sprague, A. L., Stockstill-Cahill, K. R., Starr, R. D., Weider, S. Z., Boynton, W. V., Hamara, D. K., & Goldsten, J. O. (2012). Major-element abundances on the surface of mercury: Results from the messenger gamma-ray spectrometer. Journal of Geophysical Research E: Planets, 117(11), [E00L07]. https://doi.org/10.1029/2012JE004178