The global distribution of calcium on the Moon : Implications for high-Ca pyroxene in the eastern mare region
The global distribution of calcium on the Moon : Implications for high-Ca pyroxene in the eastern mare region
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月球上钙的全球分布：对东海地区高钙辉石的影响
DOI：
10.1016/j.epsl.2012.08.010
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
他
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作者：
Yamashita Naoyuki、Hiroshi Nagaoka;他
Kaguya 伽马射线光谱仪首次揭示了月球上钙的明确全球分布。使用高能量分辨率 Ge 探测器对来自 40Ca 的 3737keV 伽马射线进行观测，并校正了快中子，大大提高了我们对这些遥感数据的信心。虽然推导的 Ca 丰度总体上证实了母海-高地二分法，但我们发现东部母海区域（如 Crisium、Nectaris 和 Fecunditatis）表现出意想不到的高 Ca 丰度。这可以通过高钙单斜辉石的区域浓度来解释。我们的 Ca 图还显示，返回样本中发现的最低 CaO 丰度（~8wt%）实际上可能在 Oceanus Procellarum 中很常见，这表明阿波罗和月球任务可能存在采样偏差。这些对 Ca 的观测结果可以作为更好地表征月球母海区域的补充标准。
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 from40Ca 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.