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Zirconium, hafnium, and rare earth element partition coefficients for ilmenite and other minerals in high-Ti lunar mare basalts - An experimental studyPartition coefficients were determined for Gd, Lu, Hf and Zr among ilmenite, armalcolite, and synthetic high-Ti mare basaltic melts at temperatures from 1122 deg to 1150 deg, and at oxygen fugacities of IW x 10 exp 0.5, by in situ analysis with an electron microprobe, using samples doped to present concentration levels. Coefficients for Zr were also measured for samples containing 600-1600 ppm Zr using this microprobe. In addition, coefficients were determined for Hf and Zr between chromian ulvospinel and melt, for Hf between pigeonite and melt, and for Lu between olivine and melt by microprobe analysis of samples doped to present levels. Values measured using the microprobe were in agreement with the values measured by analyzing mineral separates from the same run products by isotope dilution. Coefficient values for ilmenite are less than 0.01 for the LREE, are around 0.1 for the HREE, and are several times greater than this for Zr and Hf.
Document ID
19860049966
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mckay, G.
(NASA Johnson Space Center Houston, TX, United States)
Wagstaff, J.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Yang, S.-R.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
March 30, 1986
Publication Information
Publication: Journal of Geophysical Research
Volume: 91
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
86A34704
Distribution Limits
Public
Copyright
Other

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