Computer Science
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1251b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Sept. 1980, p. 1251-1264.
Computer Science
5
Actinide Series, Calcium Phosphates, Crystallization, Isotope Separation, Liquid-Solid Interfaces, Lunar Composition, Pyroxenes, Abundance, Crystal Growth, Lunar Rocks, Meteoritic Composition, Nuclear Fusion, Radiography, Trace Elements
Scientific paper
Coefficients for the partitioning of the actinide elements Th, U and Pu, which are used as indicators of r-process nucleosynthesis and the ages of meteorite and lunar samples, between diopsidic clinopyroxene, whitlockite and silicate liquid at 20 kbar are measured. Fission and alpha track radiography techniques are employed to detect element concentrations in synthetic crystals made using spiked starting materials, under the assumptions of equilibrium partitioning at the crystal-liquid interface and actinide zoning. Analysis of the data indicates results to be consistent with interface equilibrium except at high cooling rates. Th/U/Pu partition coefficients of about 0.002/0.002/O.06 are measured for clinopyroxene and 1.2/0.5/3.4 for whitlockite. The greater incorporation of Pu into the crystalline phases is attributed to the importance of trivalent Pu, and the similarity of its partition coefficient into clinopyroxene to that of the light rare earths supports the concept of Pu/rare earth dating.
Benjamin T.
Burnett Don S.
Heuser W. R.
Seitz Martin G.
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