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Actinide crystal-liquid partitioning for clinopyroxene and Ca_3(PO_4)_2

Benjamin, T. and Heuser, W. R. and Burnett, D. S. and Seitz, M. G. (1980) Actinide crystal-liquid partitioning for clinopyroxene and Ca_3(PO_4)_2. Geochimica et Cosmochimica Acta, 44 (9). pp. 1251-1264. ISSN 0016-7037. http://resolver.caltech.edu/CaltechAUTHORS:20150423-112316141

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Abstract

Using fission and alpha track radiography techniques, we have measured partition coefficients (D) for the actinide elements Th, U and Pu between diopsidic clinopyroxene, whitlockite [β-Ca_3 (PO_4)_2] and silicate liquid at 20kbar. Equilibrium partitioning at the crystal-liquid interface is assumed, and corrections for actinide zoning have been applied to the measured D values. Reproducibility for both actinide and minor element D values is carefully examined as a criterion for crystal-liquid interface equilibrium. The data are mostly compatible with interface equilibrium except for experiments at high cooling rates ( ⪸ 30 deg/hr). Partition coefficients for Th/U/Pu of about 0.002/0.002/0.06 are measured for clinopyroxene and 1.2/0.5/3.4 for whitlockite. At an oxygen fugacity of 10^(−8.5), Pu is much more readily incorporated into the crystalline phases than is U or Th because of the importance of trivalent Pu. The D_(Pu)(cpx) is similar to D(cpx) of the light rare earths supporting the concept of Pu/(rare earth) dating.


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http://dx.doi.org/10.1016/0016-7037(80)90086-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0016703780900861PublisherArticle
Additional Information:© 1980 Pergamon Press Ltd. Received 20 August 1980, Accepted 15 April 1981, Available online 4 April 2003. WE acknowledge profitable discussions with J. JONES and B. O. MYSEN and thoroughly reviews by J. A. PHILPOTTS, W. BOYNTON and A. J. IRVING. This research was supported by NASA grant NSG-7202.
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NASANSG-7202
Record Number:CaltechAUTHORS:20150423-112316141
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150423-112316141
Official Citation:T. Benjamin, W.R. Heuser, D.S. Burnett, M.G. Seitz, Actinide crystal-liquid partitioning for clinopyroxene and Ca3(PO4)2, Geochimica et Cosmochimica Acta, Volume 44, Issue 9, September 1980, Pages 1251-1264, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(80)90086-1. (http://www.sciencedirect.com/science/article/pii/0016703780900861)
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ID Code:56918
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Apr 2015 19:18
Last Modified:23 Apr 2015 19:18

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