Computer Science
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2965n&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Oct. 1991, p. 2965-2980.
Computer Science
11
Basalt, Highlands, Lunar Evolution, Lunar Rocks, Lunar Soil, Abundance, Chemical Composition, Melts (Crystal Growth), Rare Earth Elements
Scientific paper
The origin of whitlockite, a REE-rich mineral present in lunar highlands, is investigated using available experimental results of elemental partitioning between whitlockite and melt and between two immiscible liquids. A comparison with occurrences in mare basalt mesostasis assemblages demonstrated that whitlockite in the lunar highlands has not resulted from crystallization from the residual interstitial melt, and the nature of REE partition coefficients for whitlockite showed that they cannot have crystallized from KREEP melts. The only lunar melt which contains REE abundances compatible with whitlockite composition is the basic immiscible melt derived from a KREEPy liquid. It is suggested that whitlockite found in the lunar highlands is a post-cumulus metasomatic phase that precipitated from a melt formed when the urKREEP underwent silicate liquid immiscibility.
Neal Clive R.
Taylor Lawrence A.
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