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

102 Citations (Scopus)

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: Space Physics
Volume117
Issue number11
DOIs
StatePublished - 2012

Fingerprint

Gamma ray spectrometers
gamma ray spectrometers
MESSENGER (spacecraft)
Mercury surface
Mercury
spectrometer
Gamma rays
gamma rays
exosphere
regolith
X ray spectrometers
Silicates
x ray spectroscopy
silicates
sulfur
Sulfur
sampling
Spectrometry
spectrometry
spectrometers

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Evans, L. G., Peplowski, P. N., Rhodes, E. A., Lawrence, D. J., McCoy, T. J., Nittler, L. R., ... Goldsten, J. O. (2012). Major-element abundances on the surface of mercury: Results from the messenger gamma-ray spectrometer. Journal of Geophysical Research: Space Physics, 117(11), [E00L07]. https://doi.org/10.1029/2012JE004178

Major-element abundances on the surface of mercury : Results from the messenger gamma-ray spectrometer. / Evans, Larry G.; Peplowski, Patrick N.; Rhodes, Edgar A.; Lawrence, David J.; McCoy, Timothy J.; Nittler, Larry R.; Solomon, Sean C.; Sprague, Ann L.; Stockstill-Cahill, Karen R.; Starr, Richard D.; Weider, Shoshana Z.; Boynton, William V.; Hamara, David K.; Goldsten, John O.

In: Journal of Geophysical Research: Space Physics, Vol. 117, No. 11, E00L07, 2012.

Research output: Contribution to journalArticle

Evans, LG, Peplowski, PN, Rhodes, EA, Lawrence, DJ, McCoy, TJ, Nittler, LR, Solomon, SC, Sprague, AL, Stockstill-Cahill, KR, Starr, RD, Weider, SZ, Boynton, WV, Hamara, DK & Goldsten, JO 2012, 'Major-element abundances on the surface of mercury: Results from the messenger gamma-ray spectrometer', Journal of Geophysical Research: Space Physics, vol. 117, no. 11, E00L07. https://doi.org/10.1029/2012JE004178
Evans, Larry G. ; Peplowski, Patrick N. ; Rhodes, Edgar A. ; Lawrence, David J. ; McCoy, Timothy J. ; Nittler, Larry R. ; Solomon, Sean C. ; Sprague, Ann L. ; Stockstill-Cahill, Karen R. ; Starr, Richard D. ; Weider, Shoshana Z. ; Boynton, William V. ; Hamara, David K. ; Goldsten, John O. / Major-element abundances on the surface of mercury : Results from the messenger gamma-ray spectrometer. In: Journal of Geophysical Research: Space Physics. 2012 ; Vol. 117, No. 11.
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