Ordinary Chondrites: 2. Diffusion Losses of Rare Gases

Details Ordinary Chondrites: 2. Diffusion Losses of Rare Gases Ordinary Chondrites: 2. Diffusion Losses of Rare Gases

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sosyr..35..163a&link_type=abstract

Solar System Research, v. 35, Issue 2, p. 163-170 (2001).

Computer Science

Scientific paper

Data on the isotopic abundances and ratios of light rare gases (He and Ne) in 600 ordinary chondrites are analyzed. The ratio of cosmogenic isotopes (^3He/^21Ne)_cin ~20% of the ordinary chondrites has been found to lie well below the correlation line that represents the dependence of (^3He/^21Ne)_con (^22Ne/^21Ne)_c. This effect shows up most clearly in ^4He_r-chondrites, particularly in meteorites with diffusion losses of radiogenic ^21Ne_c, and is most likely attributable to the predominant (compared to ^3He_c) diffusion losses of cosmogenic ^3He_cthrough the solar heating of meteorites in orbits with small perihelion distances. This effect is enhanced by periodic variations in orbital parameters (including the perihelion distance) of meteorites throughout their exposure histories. Thermoluminescence data for ordinary chondrites confirm this scenario. The (^3He/^21Ne)_cratio for ~15% of the chondrites was significantly overestimated, which may stem from the fact that such meteorites were heavily shielded in preatmospheric bodies.

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