Computer Science
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1795k&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, July 1988, p. 1795-1813.
Computer Science
4
Chemical Composition, Europium, Lunar Crust, Lunar Rocks, Mass Balance, Highlands, Lunar Composition, Samarium, Thallium
Scientific paper
From correlations of Sm concentration and Sm/Eu ratio with Th concentration for a large number of polymict samples from various locations in the lunar highlands and the value of 0.91 μg/g for the mean Th concentration of the highlands surface crust obtained by the orbiting gamma-ray experiments, the authors estimate the mean concentrations of Sm and Eu in the lunar surface crust to be between 2 and 3 μg/g Sm and 0.7 and 1.2 μg/g Eu. The compositional trends indicate that there is no significant enrichment or depletion of Eu, on the average, compared to Sm relative to chondritic abundances; i.e., there is no significant "Eu anomaly" in average upper crust. There is little evidence in the Eu data that the lunar crust ever consisted of a thick shell of nearly pure plagioclase, as envisioned in some formulations of the "magma ocean" model of its formation.
Haskin Larry A.
Korotev Randy L.
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