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- W2084892976 abstract "The Apollo 11 soil breccias are samplers of the ancient lunar environment due to their history in the regolith and their efficient closure to addition of recent solar wind upon compaction. These breccias contain the lowest15N/14N isotopic ratio yet reported for any lunar sample (in fact, for any natural sample). This extends the range of variation of15N/14N of the solar wind to greater than 30%, from a δ15N of −190‰ in the past to +120‰ at present. No mechanism is yet known that is capable of accounting for such a large change in the15N/14N ratio without producing a substantial concomitant change in the13C/12C ratio, although some sort of nuclear reaction in the sun appears to be required. Apollo 11 soil breccias and 15086 are all formed by meteoritic impacts which compact the lower regolith against the basement rock without much heating. Rock 15086 formed from the layer of regolith between 100 and 200 cm depth, as shown by the close agreement between the nitrogen content and isotopic ratios of 15086 and those of the Apollo 15 deep drill core. Cosmic ray exposure ages, based on spallation-produced15N, are 2.3 ± 0.4 b.y. for Apollo 11 breccias. This age is much greater than the estimate from cosmogenic21Ne, presumably due to diffusive loss of neon." @default.
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- W2084892976 title "Ancient solar wind in lunar microbreccias" @default.
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- W2084892976 doi "https://doi.org/10.1016/0012-821x(80)90101-6" @default.
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