Microcraters and solar flare tracks in crystals from carbonaceous chondrites and lunar breccias

Details Microcraters and solar flare tracks in crystals from carbonaceous chondrites and lunar breccias Microcraters and solar flare tracks in crystals from carbonaceous chondrites and lunar breccias

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7..543g&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 1. (A77-34651 15-91) New York, Pergamon

Other

6

Breccia, Carbonaceous Chondrites, Lunar Soil, Meteorite Craters, Particle Tracks, Solar Flares, Craters, Lunar Craters, Micrometeoroids, Olivine, Particle Size Distribution, Solar Activity, Solar Flux Density

Scientific paper

Results of microcrater and solar-flare track studies of grains from the interiors of five carbonaceous chondrites and one lunar 'soil breccia' are combined to investigate variations in solar flare intensity, variations in micrometeorite particle flux, characteristics of interplanetary submicron particles, and the probable region in space where the precompaction irradiation occurred. The thickness turnover rate, material loss rate, and other parameters of the regolith-like surface where the meteorites must have formed are determined to a certain extent by considering published data on solar-wind and spallogenic species in the meteorites in conjunction with the present data. It is found that: (1) most irradiation features are most plausibly explained in terms of a regolith origin; (2) the shape of the solar-flare energy spectrum has not changed over the last 4.2 billion years; (3) the flux of small micrometeoroids about 4.2 billion years ago cannot have been more than 4 to 20 times higher than the flux today; and (4) parent-body regolith turnover rates were not extremely high.

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