dc.contributor.author | Peplowski, Patrick N. | en |
dc.contributor.author | Lawrence, David J. | en |
dc.contributor.author | Rhodes, Edgar A. | en |
dc.contributor.author | Sprague, Ann L. | en |
dc.contributor.author | McCoy, Timothy J. | en |
dc.contributor.author | Denevi, Brett W. | en |
dc.contributor.author | Evans, Larry G. | en |
dc.contributor.author | Head, James W. | en |
dc.contributor.author | Nittler, Larry R. | en |
dc.contributor.author | Solomon, Sean C. | en |
dc.contributor.author | Stockstill-Cahill, Karen R. | en |
dc.contributor.author | Weider, Shoshana Z. | en |
dc.date.accessioned | 2013-04-22T18:26:17Z | |
dc.date.available | 2013-04-22T18:26:17Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Peplowski, Patrick N., Lawrence, David J., Rhodes, Edgar A., Sprague, Ann L., McCoy, Timothy J., Denevi, Brett W., Evans, Larry G., Head, James W., Nittler, Larry R., Solomon, Sean C., Stockstill-Cahill, Karen R., and Weider, Shoshana Z. 2012. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F20547">Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer</a>." <em>Journal of Geophysical Research. E. Planets</em>. 117:<a href="https://doi.org/10.1029/2012JE004141">https://doi.org/10.1029/2012JE004141</a> | en |
dc.identifier.issn | 2169-9097 | |
dc.identifier.uri | http://hdl.handle.net/10088/20547 | |
dc.description.abstract | A technique for converting gamma-ray count rates measured by the Gamma-Ray Spectrometer on the MESSENGER spacecraft to spatially resolved maps of the gamma-ray emission from the surface of Mercury is utilized to map the surface distributions of the elements Si, O, and K over the planet's northern hemisphere. Conversion of the K gamma-ray count rates to elemental abundances on the surface reveals variations from 300 to 2400 ppm. A comparison of these abundances with models for the maximum surface temperature suggests the possibility that a temperature-related process is controlling the K abundances on the surface as well as providing K to the exosphere. The abundances of K and Th have been determined for several geologically distinct regions, including Mercury's northern smooth plains and the plains interior to the Caloris basin. The lack of a significant variation in the measured Th abundances suggests that there may be considerable variability in the K/Th abundance ratio over the mapped regions. | en |
dc.relation.ispartof | Journal of Geophysical Research. E. Planets | en |
dc.title | Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer | en |
dc.type | Journal Article | en |
dc.identifier.srbnumber | 113713 | |
dc.identifier.doi | 10.1029/2012JE004141 | |
rft.jtitle | Journal of Geophysical Research. E. Planets | |
rft.volume | 117 | |
dc.description.SIUnit | NMNH | en |
dc.description.SIUnit | NH-Mineral Sciences | en |
dc.description.SIUnit | Peer-reviewed | en |