Computer Science
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..861s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, March 1991, p. 861-880.
Computer Science
22
Chondrule, Meteoritic Composition, Neutron Activation Analysis, Petrography, Rare Gases, Geochronology, Iodine Isotopes, Plutonium Isotopes, Uranium Isotopes, Xenon Isotopes, Meteorites, Iodine, Xenon, Isotopic Ratios, Petrography, Chemistry, Chainpur, Chondrules, Chondrites, Stony Meteorites, Ll3 Chondrites, Samples, Meteorite, Laboratory Studies, Neutron Activation Analysis, Inaa, Rare Gases, Matrix, Age Dating, Ages, Sulfide, Texture, Data, Lithophiles, Refractory Material, Models, Shock Effects, Procedu
Scientific paper
INAA, noble gas, and petrographic studies conducted on samples of 18 chondrules and matric material from the Chainpur (LL3) indicate that the I-129/I-127 ratio, R(0), varies by a factor of more than 10 among the chondrules. This corresponds to a greater-than-50 Ma span in apparent I-Xe ages. Models which invoke either gas-dust mixing or nebular heterogeneity cannot satisfactorily explain these data, any more than can hypotheses which attribute the variations to differences in formation age, metamorphic rate, or time of aqueous alteration. It is alternatively suggested that the variations represent periods of low-grade shock events.
Caffee Marc W.
Hohenberg Charles M.
Jeffrey Taylor G.
Lindström Markus
Swindle Timothy D.
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