Computer Science
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..127c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Jan. 1979, p. 127-133, 135, 136. NSF-supported research.
Computer Science
5
Meteoritic Composition, Stony Meteorites, Thorium, Trace Elements, Uranium, Abundance, Achondrites, Calcium, Chondrites, Concentration (Composition), Fission Products, Geochemistry, Phosphates, Plutonium Isotopes, Uranium, Thorium, Stony Meteorites, Meteorites, Fission Track Analysis, Concentrations, Phases, Calcium, Chlorapatite, Achondrites, Fractionation, Xenon, Chondrites, Phosphates, Whitelockite
Scientific paper
Uranium distributions have been determined in seventeen meteorites using fission track techniques. In seven cases, Th was also determined by a method using fast neutrons. The actinides are generally concentrated in phosphates, usually whitlockite and/or chlorapatite. Wherever whitlockite and chlorapatite coexist, chlorapatite is richer in uranium. U concentrations in a given phosphate phase are highly variable from meteorite to meteorite and sometimes also show large variations in the same meteorite. A clinopyroxene phase enriched in U (about 0.2-0.3 ppm) is usually found in Ca-rich achondrites. The Th/U ratios of phosphates differ considerably from whole-rock values, indicating that these elements were fractionated during meteorite formation.
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