Chlorine Abundances In Meteorites

Details Chlorine Abundances In Meteorites Chlorine Abundances In Meteorites

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..419g&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 2, pp. 419-429 (2000).

Computer Science

28

Scientific paper

We used the nuclear reaction 37Cl (n,() 38Ar, achieved during neutron irradiation to date meteorites by the 39Ar-40Ar technique, to calculate the elemental chlorine concentration of 132 samples of 94 different meteorites, mostly finds, representing several different classes. Determined K and Ca concentrations are also reported. Total [Cl] varies considerably, both among meteorites of the same class and among different meteorite classes. The range in [Cl] is ~15-177 ppm for ordinary chondrites; ~24-650 ppm for enstatite chondrites; ~4-177 ppm for eucrites; ~7-128 ppm for mesosiderites; ~35-268 ppm for acpulcoites and lodranites; and ~12-507 ppm for winonaites and iron silicates. As expected, most differentiated meteorites have lower [Cl] compared to chondrites and iron silicates. Analyses of 11 interior samples (~0.1 g each) of a large L6 chondrite varied over 68-129 ppm, and is a measure of the homogeneity of Cl distribution. By evaluating Ar release during stepwise sample degassing, we separated the Cl into low-temperature and high-temperature components, the former of which may consist of terrestrial contamination. Most samples show low-temperature Cl concentrations of <40 ppm, but for several samples terrestrial Cl contamination comprises significant fractions of the total Cl. Among most differentiated meteorites, finds show considerably greater low-temperature [Cl] compared to falls.

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