NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Hf, Zr, and REE partition coefficients between ilmenite and liquid - Implications for lunar petrogenesisPartition coefficients (D) between ilmenite and coexisting liquid were determined under near-lunar conditions for Hf, Zr, and REE. Through isotope dilution analysis, ilmenite D values of 0.41 and 0.33 were obtained for Hf and Zr respectively, values significantly lower than those of ilmenite from a kimberlite megacryst. Partition coefficients of REE for the synthesized ilmenite are slightly smaller than those of ilmenite from the kimberlite megacryst, and the lunar (Lu) partition coefficient is 0.056. These results suggest that ilmenite was significant in the lunar-Hf evolution of lunar mare basalts. Using lunar and Hf D values for ilmenite, the Lu-Hf evolution of lunar cumulates and the coexisting magma was examined for various crystallization sequences. The Lu-Hf variation trend of most high-Ti mare basalts is explained by a small degree of partial cumulate melting, though a higher degree is required to explain the variation of very low-Ti basalts, green glass, and Apollo 12 low-Ti basalts. Apollo 15 low-Ti basalts may require chromite crystallization as well.
Document ID
19860049967
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nakamura, Y.
(Geological Survey Denver, CO, United States)
Fujimaki, H.
(Geological Survey Denver, CO, United States)
Nakamura, N.
(Geological Survey Denver, CO, United States)
Tatsumoto, M.
(USGS Denver, CO, United States)
Mckay, G. A.
(NASA Johnson Space Center 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
86A34705
Funding Number(s)
CONTRACT_GRANT: NASA ORDER T-783-H
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available