He, Ne, and AR from the solar wind and solar energetic particles in lunar ilmenites and pyroxenes

Details He, Ne, and AR from the solar wind and solar energetic particles in lunar ilmenites and pyroxenes He, Ne, and AR from the solar wind and solar energetic particles in lunar ilmenites and pyroxenes

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813147b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E7, p. 13,147-13,162.

Physics

102

Abundance, Ilmenite, Lunar Rocks, Pyroxenes, Solar Wind, Argon, Fractionation, Helium, Neon, Regolith, Moon, Samples, Lunar, Ilmenite, Pyroxene, Helium, Neon, Argon, Data, Rare Gases, Solar Wind, Charged Particles, Regolith, Implantation, Radiation Effects, Laboratory Studies, Depth, Isotopes, Irradiation, Composition, Energy, Fractionation, Element Ratios, Procedure, 79035, Experiments, Concentration, Abundance, Patterns, Plagioclase, 71501, Apollo 17 Mission

Scientific paper

The paper presents the results of analyzes of He, Ne, and Ar in ilmenite and pyroxene separates from two lunar regolith samples exposed to the solar corpuscular radiation at widely different epochs, carried out with the purpose of finding the least altered record of solar noble gases yet observed from the lunar regolith. The analyses were performed using the closed system stepped etching technique, making it possible to avoid element or isotope fractionation due to diffusion during the experiment and thus to determine depth profiles of element and isotopic composition of implanted solar noble gases. The results indicate that ilmenite retains isotopically unfractionated He, Ne, and Ar from the solar wind (SW) in the outermost grain layers. The isotopic composition of SW noble gases has remained constant over the last 100 MA, but there is evidence of a slight change over a Ga timescale. Evidence is also presented for the identification of a solar energetic particle component, which was implanted with energies exceeding those in the solar wind.

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