Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mbns.conf...29j&link_type=abstract
The Moon Beyond 2002: Next Steps in Lunar Science and Exploration, p. 29
Computer Science
Lunar Composition, Lunar Evolution, Lunar Crust, Lunar Mantle, Thorium, Aluminum, Remote Sensing, Models, Radioactive Decay
Scientific paper
Global compositional remote sensing of the Moon, coupled with accurate correlation of results to Apollo and Luna samples and lunar meteorites, has led to new efforts to estimate crustal and bulk Moon compositions. Global data permit delineation of broad geochemical terranes on the Moon and extrapolation of compositions to depth on the basis of material excavated from the middle and perhaps lower crust by basin impacts. Crustal compositions inferred from surface data and mantle compositions inferred from mare basalts permit estimation of lunar bulk composition. Here, we discuss results for Th and Al, two elements that have been extracted from the mantle and concentrated strongly into the crust during global lunar differentiation. Assessment of Th content is important for determining the thermal evolution of the Moon resulting from heat of radioactive decay. Our model follows the general model described, but here we consider the implications of thinner crust, suggested by recent re-evaluation of Apollo seismic data.
Gillis Jeffery J.
Jolliff Brad L.
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