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Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..493l&link_type=abstract
Geophysical Research Letters, vol. 7, July 1980, p. 493-496. Research supported by the Robert R. McCormick Trust
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Abundance, Anomalies, Carbonaceous Chondrites, Inclusions, Meteoritic Composition, Oxygen Isotopes, Calcium Isotopes, Cerium, Chemical Composition, Fractionation, Mineralogy, Meteorites, Allende Meteorite, Oxygen, Isotopes, Anomalies, Inclusions, Hal, Comparisons, Composition, Experiment, Procedure, Mineralogy, Fractionation, Heating, Evaporation, Grains, Fun, Data, Magnesium, Silicon, Calcium, Characteristics, Models, Samples, Meteorite
Scientific paper
An oxygen isotopic study which demonstrates the Allende inclusion HAL is a FUN object is discussed; the hibonite core, black inner rim and fine-grained outer rim have beem sampled. The oxygen in HAL is found to be heterogeneous, the rim samples having oxygen compositions similar to that of melilites and alteration products in other Allende inclusions including the FUN inclusion EK1-4-1, while the oxygen in the hibonite core shows the most extreme deviation from the AD line so far observed. The oxygen in HAL hibonite, in ED1-4-1 spinel and in spinels of usual Allende inclusions form an approximate linear array with a slope close to 1/2. With regard to the fractionation process, it is noted that the fractionation per amu for various elements does not correlate inversely with mass and that fractionation is elementally selective, probably according to volatility.
Clayton Robert N.
Lee Taegweon
Mayeda Toshiko K.
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