The distribution of U and PU in the St. Severin chondrite

Details The distribution of U and PU in the St. Severin chondrite The distribution of U and PU in the St. Severin chondrite

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1895j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Dec. 1979, p. 1895-1905.

Mathematics

Logic

6

Abundance, Chondrites, Meteoritic Composition, Plutonium, Uranium, Fission, Grain Boundaries, Metamorphism (Geology), Radiography, Solar System, Surface Layers, Thermal Emission, Xenon Isotopes

Scientific paper

A detailed study of the U distribution of the St. Severin chondrite has been made by fission track radiography in order to clarify the interpretation of fission Xe thermal release data in terms of the mineralogical location of the fission Xe within the meteorite. This is of importance because the Pu-244/U-238 ratio for St. Severin has been widely adopted as the average solar system value. The U contents of the constituent minerals cannot account for the total rock U which, instead, appears to be primarily localized on grain boundaries. The greatest localizations of U are in olivine-poor, orthopyroxene-rich 'clasts'. The data coupled with that of Podosek (1970) show that Pu-244 in St. Severin was also located on grain boundaries and that the bulk of Pu and U are unfractionated within this meteorite. Due to recoil, the Pu-244 fission Xe is found in 10-micron surface layers on major phases. Assuming that the grain boundaries (on which the Pu was located) were formed during metamorphism, the Pu-244/U-238 ratio for St. Severin applies to a time subsequent to the textural recrystallization of the meteorite. Data support the interpretation of Podosek and the best estimate of the solar system Pu-244/U-238 ratio is 0.015.

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