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Charge balancing of trivalent trace elements in olivine and low-Ca pyroxene - A test using experimental partitioning dataCharge-balancing substitution mechanisms are determined for the incorporation of the trivalent cations Al and Sc in low-Ca pyroxene and Al, Sc, Yb, and Cr in olivine. In low-Ca pyroxene, the substitution mechanism is determined by evaluating covariations of trivalent trace cations with Si, Mg, Fe, and Ca. In olivine, substitution mechanisms are determined by comparing the observed compositional dependence of partitioning to the compositional dependence theoretically expected for each substitution reaction. A realistic equilibrium constant is formulated for trace element exchanges between olivines, low-Ca pyroxenes, and melt, making possible improved modeling of the variations of trace element partitioning with temperature and phase composition.
Document ID
19890047248
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Colson, R. O.
(Tennessee Univ. Knoxville, TN, United States)
Taylor, L. A.
(Tennessee, University Knoxville, United States)
Mckay, G. A.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1989
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 53
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
89A34619
Funding Number(s)
CONTRACT_GRANT: NGT-43-001-808
CONTRACT_GRANT: NAG9-62
Distribution Limits
Public
Copyright
Other

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