Variations in K/Th on Mars

被引：82
作者：
Taylor, G. Jeffrey
Stopar, J. D.
Boynton, W. V.
Karunatillake, S.
Keller, J. M.
Brueckner, J.
Waenke, H.
Dreibus, G.
Kerry, K. E.
Reedy, R. C.
Evans, L. G.
Starr, R. D.
Martel, L. M. V.
Squyres, S. W.
Gasnault, O.
Maurice, S.
d'Uston, C.
Englert, P.
Dohm, J. M.
Baker, V. R.
Hamara, D.
Janes, D.
Sprague, A. L.
Kim, K. J.
Drake, D. M.
McLennan, S. M.
Hahn, B. C.
机构：
[1] Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
[2] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA
[3] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA
[4] Max Planck Inst Chem, D-55020 Mainz, Germany
[5] Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA
[6] Comp Sci Corp, Lanham, MD 20706 USA
[7] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA
[8] Univ Toulouse 3, CNRS, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France
[9] Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA
[10] TechSource, Santa Fe, NM 87594 USA
[11] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | 2006年 / 111卷 / E3期
关键词：
D O I：
10.1029/2006JE002676
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：
[ 1] K/Th determined by the Mars Odyssey Gamma Ray Spectrometer varies by a factor of 3 on Mars ( 3000 to 9000), but over 95% of the surface area has K/Th between 4000 and 7000. K/Th is distinctly lower than average in some areas, including west of Olympus Mons in the Amazonis Planitia, the region around Memnonia Fossae, Chryse Planitia, southeastern Arabia Terra, Syrtis Major Planum, and northwest of Apollinaris Patera. On the other hand, K/Th is distinctly higher than average in other areas, including the central part of Valles Marineris and the surrounding highlands, and in the northern part of Hellas. The generally modest variation in K/Th may be explained by inherent variations in igneous rocks and by variations in the extent of aqueous alteration.
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页数：20
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