Concentration of H, Si, Cl, K, Fe, and Th in the low- and mid-latitude regions of Mars

被引:213
作者
Boynton, W. V. [1 ]
Taylor, G. J. [2 ]
Evans, L. G. [3 ]
Reedy, R. C. [4 ]
Starr, R. [5 ]
Janes, D. M. [1 ]
Kerry, K. E. [1 ]
Drake, D. M. [6 ]
Kim, K. J. [1 ,4 ]
Williams, R. M. S. [1 ]
Crombie, M. K. [1 ]
Dohm, J. M. [7 ]
Baker, V. [7 ]
Metzger, A. E. [8 ]
Karunatillake, S. [9 ]
Keller, J. M. [1 ,10 ]
Newsom, H. E. [4 ]
Arnold, J. R. [11 ]
Brueckner, J. [12 ]
Englert, P. A. J. [2 ]
Gasnault, O. [13 ]
Sprague, A. L. [1 ]
Mitrofanov, I. [14 ]
Squyres, S. W. [9 ]
Trombka, J. I. [15 ]
d'Uston, L. [13 ]
Waenke, H. [12 ]
Hamara, D. K. [1 ]
机构
[1] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA
[2] Univ Hawaii Manoa, Inst Geophys & Planetol, Honolulu, HI 96822 USA
[3] Comp Sci Corp, Sci Programs, Lanham, MD USA
[4] Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA
[5] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA
[6] TechSource, Santa Fe, NM USA
[7] Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ USA
[8] CALTECH, Jet Propuls Lab, Pasadena, CA 91125 USA
[9] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY USA
[10] Calif State Polytech Univ Pomona, Dept Phys, San Luis Obispo, CA USA
[11] Univ Calif San Diego, Dept Chem, La Jolla, CA 92093 USA
[12] Max Planck Inst Chem, D-55128 Mainz, Germany
[13] CNRS, Ctr Detude Spatiale Rayonnements, UPS, Toulouse, France
[14] Inst Space Res, Moscow, Russia
[15] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
关键词
D O I
10.1029/2007JE002887
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We report maps of the concentrations of H, Si, Cl, K, Fe, and Th as determined by the Gamma Ray Spectrometer (GRS) on board the 2001 Mars Odyssey Mission for +/-similar to 45 degrees latitudes. The procedures by which the spectra are processed to yield quantitative concentrations are described in detail. The concentrations of elements determined over the locations of the various Mars landers generally agree well with the lander values except for Fe, although the mean of the GRS Fe data agrees well with that of Martian meteorites. The water-equivalent concentration of hydrogen by mass varies from about 1.5% to 7.5% (by mass) with the most enriched areas being near Apollinaris Patera and Arabia Terra. Cl shows a distribution similar to H over the surface except that the Cl content over Medusae Fossae is much greater than elsewhere. The map of Fe shows enrichment in the northern lowlands versus the southern highlands. Silicon shows only very modest variation over the surface with mass fractions ranging from 19% to 22% over most of the planet, though a significant depletion in Si is noted in a region west of Tharsis Montes and Olympus Mons where the Si content is as low as 18%. K and Th show a very similar pattern with depletions associated with young volcanic deposits and enrichments associated with the TES Surface Type-2 material. It is noted that there appears to be no evidence of significant globally distributed thick dust deposits of uniform composition.
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页数:15
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