Other
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9...41f&link_type=abstract
Geophysical Research Letters, vol. 9, Jan. 1982, p. 41-44.
Other
13
Calcium Sulfides, Chondrites, Mineralogy, Planetary Cores, Radioactive Materials, Uranium, Enstatite, Particle Tracks, Plutonium, Potassium
Scientific paper
In the Hvittis enstatite chondrite fission track radiography shows that U is highly concentrated in CaS (oldhamite), with a concentration of 400 + or - 50 ppb. The oldhamite U concentrations are equilibrated, although intergrain concentration variations of less than 15% would not be detected. Various approaches to a U material balance do not agree, but at least 50% and, more likely, nearly 100% of the U is concentrated in CaS. It is likely that CaS is the major reservoir for other actinide and lanthanide elements as well. Consequently, enstatite chondrites may provide reliable Pu/U abundance ratios. The highly reducing formation conditions for enstatite chondrites have caused U to deviate from lithophile behavior, but K is observed to remain lithophile. Although this observation may not be generalizable, it is proposed that discussions of radioactive heating of planetary cores should include U and Th and not focus exclusively on K.
Burnett Don S.
Furst Marian J.
Stapanian M. I.
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