Other
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2511c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Dec. 1982, p. 2511-2525.
Other
10
Carbonaceous Chondrites, Iodine Isotopes, Meteoritic Composition, Radioactive Age Determination, Correlation, Metamorphism (Geology), Olivine, Petrography, Trace Elements, Xenon Isotopes
Scientific paper
Eight C3 chondrites were examined by the I-129 to Xe-129 dating method to determine whether their initial I-129/I-127 ratios, or R(0), correlate with any other properties. The R(0)'s range from 1.60 x 10 to the -4th to 1.09 x 10 to the -4th, corresponding to I to Xe ages from 2.0 Myr before to 6.7 Myr after the Murchison magnetite. Three C30's have essentially indistinguishable R(0)'s, while a fourth is undatable. Four C3V's show a distinct spread, ranging from 1.60 + or 0.07 x 10 to the -4th to 1.09 + or - 0.10 x 10 to the -4th. These R(0)'s correlate inversely with four other properties: I, Br, and Cd content, olivine composition, both percent mean deviation, and proportion of iron-poor olivine grains. The simplest model that accounts for the correlations with R(0) involves mixing of two iodine components in the solar nebula, associated with gas and grains, respectively. The second, of lower I-129/I-127 ratio, predominated at later times and thus became enriched in late-formed meteorites.
Anders Edward
Crabb Jane
Lewis Reed S.
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