Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..843n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, June 1979, p. 843-860.
Astronomy and Astrophysics
Astronomy
26
Iron Meteorites, Meteoritic Composition, Radioactive Age Determination, Silicates, Troilite, Astronomical Models, Evolution (Development), Iodine Isotopes, Mineralogy, Xenon Isotopes
Scientific paper
Silicate and troilite inclusions from IAB iron meteorites were dated by the I-Xe technique. Silicate samples from inclusions in the Copiapo, Landes, Woodbine, Pitts and Mundrabilla meteorites and troilite samples from Pitts and Mundrabilla were subjected to neutron irradiation and the xenon isotope ratios produced were determined. Well-defined I-Xe ages were obtained for Woodbine, Copiapo, Landes and Mundrabilla and are found to be within 3.7 million years of the Bjurbole meteorite, suggesting a close relationship to the stone chondrites. The analysis of troilite from Pitts suggests an age of 17 million years older than Bjurbole, while Mundrabilla troilite is observed to predate Mundrabilla silicate. The abundances of Ga, Ge and Ni are found to be correlated with I-Xe ages, supporting the validity of the I-Xe dating method. The results are considered to favor a nebular model of meteorite formation.
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