Ancient solar wind in lunar microbreccias

Details Ancient solar wind in lunar microbreccias Ancient solar wind in lunar microbreccias

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..47...34t&link_type=abstract

Earth and Planetary Science Letters, vol. 47, no. 1, Mar. 1980, p. 34-42.

Computer Science

10

Breccia, Lunar Evolution, Lunar Soil, Solar Wind, Apollo Flights, Carbon Isotopes, Cosmic Rays, Nitrogen Isotopes, Moon, Solar Wind, Microbreccias, Apollo 11, History, Regolith, Soils, Nitrogen, Isotopic Ratios, Isotopes, Samples, Lunar, Carbon, 15086, Meteoroid Impacts, Cosmic Rays, Exposure Ages, Dating Techniques, Spallation, Cosmogenic Elements, Neon, Experiments, Procedure, Data, Heating, Temperatures, Formation, Apollo 15, Landing Sites, Models, Shock, Comparisons, Gases

Scientific paper

Possible components of the ancient solar wind, particularly the N-15/N-14 ratio, are investigated on the basis of lunar microbreccia studies. Nitrogen contents and isotope ratios were determined for Apollo 11 and 15 microbreccia samples by means of vacuum pyrolysis techniques. The Apollo 11 soil breccias, which had been closed to the addition of recent solar wind due to their compaction, are found to contain the lowest N-15/N-14 ratios yet reported for the solar wind, extending the range of variation of the ratio to between a delta N-15 of -190% in the past to +120% at present. Nitrogen isotope analysis of the Apollo 15 drill core, which had undergone two episodes of solar wind exposure, also support the secular variation in the N-15 content of the solar wind, which is attributed to spallation reactions in the sun. The formation of the breccias at the Apollo 11 and 15 sites is discussed on the basis of the observed nitrogen systematics, and differences between N-15 and Ne-21 cosmic ray exposure ages implied are attributed to the diffusive loss of neon from lunar soils.

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