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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Lunar nitrogen: indigenous signature and cosmic-ray production rate
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Lunar nitrogen: indigenous signature and cosmic-ray production rate

机译：月球氮：土著人的签名和宇宙射线的生产​​率

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摘要

Indigenous lunar nitrogen composition and abundances have been determined in old ferroan anorthosite 60025 an in anorthositic breccia 67915 from North Ray Crater, as well as in 55 cm deep volcanic glasses of 74001 double-drive core from Shorty Crater. Also included in the set is the well-documented lunar basalt 75075, collected near the Camelot Crater. Indigenous lunar N abundances are low (at ppm level), but there is some variation between glass-rich cores, mare basalts and anorthosites. The uniform indigenous N isotopic signature of δ~(15)N = +13.0 ± 1.2‰, is consistent with data reported previously for Shorty Crater samples. The indigenous δ~(15)N cannot account for the light nitrogen component, observed in the lunar regolith samples. We have determined cosmic-ray production rates P(~(15)N) for the above rocks and the drill core samples. The average production rate estimate (for low shielding) of P(~(15)N) = 5.8 ± 0.6 pg ~(15)N/g/Ma is ～60% higher than published lunar ~(15)N production rates, but consistent with the meteoritic production rate derive from silicates in the Enon meteorite, when normalized to 2π-irradiation geometry. From the observed cosmogenic ~(15)N excesses and the reported cosmogenic ~(21)Ne abundances in core 74001 we derive a (~(15)N_C/~(21)Ne_C) production rate ratio of 4.0 ± 0.3 for silicates.
机译：已从North Ray Crater的旧铁锰铁钙铁矿中的老铁锰钙铁矿60025中测定了本地月球氮含量和丰度，并从Shorty Crater的55cm深火山岩中提取了74001双驱动岩心。套装中还包括收集良好的月球玄武岩75075，收集在卡米洛特火山口附近。土著的月球氮丰度很低（ppm级），但是富含玻璃的岩心，母马玄武岩和钙长石之间存在一些差异。 δ〜（15）N = +13.0±1.2‰的均匀本地N同位素特征与先前报道的Shorty Crater样品的数据一致。在月球长石样本中观察到，原始的δ〜（15）N不能解释轻氮成分。我们已经确定了上述岩石和钻芯样品的宇宙射线生产率P（〜（15）N）。 P（〜（15）N）= 5.8±0.6 pg〜（15）N / g / Ma的平均生产率估计值（用于低屏蔽）比已公布的月球〜（15）N生产率高约60％，但是当归一化为2π辐射几何形状时，与陨石生产率一致的是来自于Enon陨石中的硅酸盐。从观察到的宇宙成因〜（15）N过量和核心74001中报告的宇宙成因〜（21）Ne丰度，我们得出硅酸盐的（〜（15）N_C /〜（21）Ne_C）生产率比为4.0±0.3。

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