TY - JOUR
T1 - The global distribution of calcium on the Moon
T2 - Implications for high-Ca pyroxene in the eastern mare region
AU - Yamashita, N.
AU - Gasnault, O.
AU - Forni, O.
AU - d'Uston, C.
AU - Reedy, R. C.
AU - Karouji, Y.
AU - Kobayashi, S.
AU - Hareyama, M.
AU - Nagaoka, H.
AU - Hasebe, Nobuyuki
AU - Kim, K. J.
PY - 2012/11/1
Y1 - 2012/11/1
N2 - The first unambiguous global distribution of Ca on the Moon has been revealed by the Kaguya Gamma-Ray Spectrometer. The observation of the 3737keV gamma rays from 40Ca with a high energy resolution Ge detector, corrected for fast neutrons, improved greatly our confidence in these remote sensing data. While the derived Ca abundance generally confirms the mare-highland dichotomy, we found that the eastern mare regions such as Crisium, Nectaris, and Fecunditatis exhibit unexpected high Ca abundances. This may be explained by regional concentrations of high-Ca clinopyroxene. Our Ca map also shows that the lowest CaO abundance found in the returned samples (~8wt%) may actually be common in Oceanus Procellarum, suggesting the possible sampling bias of Apollo and Luna missions. These observational results on Ca serve as a complementary criterion for better characterization of mare regions on the Moon.
AB - The first unambiguous global distribution of Ca on the Moon has been revealed by the Kaguya Gamma-Ray Spectrometer. The observation of the 3737keV gamma rays from 40Ca with a high energy resolution Ge detector, corrected for fast neutrons, improved greatly our confidence in these remote sensing data. While the derived Ca abundance generally confirms the mare-highland dichotomy, we found that the eastern mare regions such as Crisium, Nectaris, and Fecunditatis exhibit unexpected high Ca abundances. This may be explained by regional concentrations of high-Ca clinopyroxene. Our Ca map also shows that the lowest CaO abundance found in the returned samples (~8wt%) may actually be common in Oceanus Procellarum, suggesting the possible sampling bias of Apollo and Luna missions. These observational results on Ca serve as a complementary criterion for better characterization of mare regions on the Moon.
KW - Calcium
KW - Gamma-ray spectroscopy
KW - High-Ca pyroxene
KW - Kaguya
KW - Moon
KW - SELENE
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U2 - 10.1016/j.epsl.2012.08.010
DO - 10.1016/j.epsl.2012.08.010
M3 - Article
AN - SCOPUS:84865809500
SN - 0012-821X
VL - 353-354
SP - 93
EP - 98
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
ER -