Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..779r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 8, pp.779-800
Astronomy and Astrophysics
Astrophysics
11
Scientific paper
Cl, Br and I contents in samples of the several classes of chondrites have been simultaneously measured by activation analysis. Auxiliary information derived from this work confirms U and Te concentrations and I/Te ratios reported in the literature. For the ordinary (bronzite and hypersthene), pigeonite, enstatite and carbonaceous chondrites the respective Cl contents are 4-90, 120, 516 and 280 ppm; the Br contents are 0·05-0·2, 2·0, 1·5-6·5 and 2·0-11·0 ppm and the I contents are 0·05-0·08, 0·16, 0·07-0·47 and 0·23-1·21 ppm. Cl and Br are positively correlated; most chondrites fall on correlation lines with Cl/Br weight ratios between 20 and 100. Br and I exhibit a simple correlation; most meteorites fall near a line with a Br/I weight ratio of about 1. Leaching experiments yielded results that supported these interhalogen relations, and also gave the degree of water solubility of the halogens: Cl < Br ~ I ~ Te. Abundances derived from the data support current thinking that the Type I carbonaceous chondrites have best retained a primordial complement of solar system matter. The astrophysical and meteoritic abundances of chlorine based on oxygen agree reasonably well, 22 vs. ~9 atom Cl /10 4 atom 0; whereas the abundance based on Si differ greatly, 1·5 × 10 5 vs. 2800 atom Cl /10 6 atom Si.
Allen Ralph O. Jr.
Reed George W. Jr.
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