| Autor: |
Nobuyuki Hasebe, Olivier Gasnault, Y. Karouji, Olivier Forni, Naoyuki Yamashita, Shingo Kobayashi, Makoto Hareyama, Claude d’Uston, Robert C. Reedy, Kyeong Ja Kim, H. Nagaoka |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Earth and Planetary Science Letters. :93-98 |
| ISSN: |
0012-821X |
| Popis: |
The first unambiguous global distribution of Ca on the Moon has been revealed by the Kaguya Gamma-Ray Spectrometer. The observation of the 3737 keV gamma rays from 40 Ca 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 (∼8 wt%) 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect