Other
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..201m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Feb. 1979, p. 201-206.
Other
9
Carbonaceous Chondrites, Meteoritic Composition, Radioactive Age Determination, Rubidium Isotopes, Strontium Isotopes, Leaching, Nuclear Fusion, Orgueil Meteorite, Radiogenic Materials, Rocks, Weathering, Potassium, Rubidium, Strontium, Carbonaceous Chondrites, Meteorites, Isotopic Ratios, Weathering, Isochron, Samples, Murchison Meteorite, Radiogenic Elements, Concentrations, Ivuna Meteorite, Orgueil Chondrite, Composition, Erakot Meteorite
Scientific paper
Rb-Sr whole rock analyses have been performed on 2 CI and 3 CM chondrites. Four of these stones (Ivuna, Orgueil, Cold Bokkeveld and Erakot) were previously studied in this laboratory and were shown to be discordant from a 4.6 Gyr isochron. The fifth, Murchison, was not previously studied. The new data support the discordance of the first four stones, and indicate that Murchison is also discordant. Studies of Sr isotope ratios in unspiked Orgueil show that the discordance is not due to inhomogeneities in the Sr-84/Sr-86 ratio caused by incomplete mixing of nucleosynthesis products. In order to gauge the effects of weathering, two leaching experiments were performed on fresh, interior samples of Murchison; one for a period of 1.5 hr and the other for 117 hr. The results indicate that the relative solubility of nonradiogenic Sr is approximately twice that of Rb and radiogenic Sr is more soluble than the nonradiogenic Sr.
Mittlefehldt Dave W.
Wetherill George W.
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