Exposure history of the regolithic chondrite Fayetteville. I - Solar-gas-rich matrix

Details Exposure history of the regolithic chondrite Fayetteville. I - Solar-gas-rich matrix Exposure history of the regolithic chondrite Fayetteville. I - Solar-gas-rich matrix

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1441w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, June 1989, p. 1441-1448. Research supported by SNSF and CNRS.

Computer Science

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Chondrites, Meteoritic Composition, Regolith, Cosmochemistry, Neon Isotopes, Solar Cosmic Rays, Solar Flares, T Tauri Stars, Meteorite, Exposure Age, H4 Chondrites, Fayetteville, Samples, Meteorite, Matrix, Neon 21, Abundance, Concentration, Cosmogenic Elements, Distance, Irradiation, Cosmic Rays, Parent Bodies, Regolith, Procedure, Rare Gases, Solar Flames, Tracks, Orbits, Laboratory Studies

Scientific paper

Solar gas bearing matrix samples of the H4 chondrite Fayetteville contain up to 45 percent more cosmogenic Ne-21 than some of the solar-gas-free light inclusions. Concentrations of solar and cosmogenic Ne in the matrix samples correlate. The excesses of cosmogenic Ne are comparable to those found in two out of three groups of track-rich grains of Fayetteville studied by Caffee at al. (1986). The excesses can be explained by a GCR-irradiation of a considerable part, if not all, of the matrix grains in their parent body regolith during at least some 20 Ma. No need is seen to postulate a T-Tauri type solar cosmic ray irradiation of Fayetteville's regolith. The parent body exposures derived here are considerably longer than the less than 1 Ma predicted by the model on the evolution of asteroidal regoliths by Housen et al. (1979). The ratio of solar to cosmogenic gas acquired in the regolith points to an orbit of Fayetteville's parent body at some 2-3 AU.

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