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Observation of non-lithophile behavior for U

Furst, Marian J. and Stapanian, Maritza I. and Burnett, D. S. (1982) Observation of non-lithophile behavior for U. Geophysical Research Letters, 9 (1). pp. 41-44. ISSN 0094-8276. doi:10.1029/GL009i001p00041.

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In the Hvittis enstatite chondrite fission track radiography shows that U is highly concentrated in CaS (oldhamite), with a concentration of 400±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 behaviour, but K is observed to remain lithophile. Although this observation may not be generalizable, we propose that discussions of radioactive heating of planetary cores should include U and Th and not focus exclusively on K.

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Burnett, D. S.0000-0001-9521-8675
Additional Information:Copyright 1982 by the American Geophysical Union. (Received August 3, 1981; accepted October 19, 1981.) Paper number 1L1659. The Hvittis sample was generously provided by Roy Clarke, U.S. National Museum. We thank M. Murrell, E. Stolper and K. Goettel for helpful discussions. Research support was by NSF grant EAR79-20091A-1. Caltech Contribution No. 3656.
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Caltech Division of Geological and Planetary Sciences3656
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Official Citation:(1982), Observation of non-lithophile behavior for U. Geophysical Research Letters, 9: 41–44. doi: 10.1029/GL009i001p00041
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51519
Deposited By: George Porter
Deposited On:10 Nov 2014 21:54
Last Modified:10 Nov 2021 19:12

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