Iron and titanium distribution on the moon from orbital gamma ray spectrometry with implications for crustal evolutionary models

Details Iron and titanium distribution on the moon from orbital gamma ray spectrometry with implications for crustal evolutionary models Iron and titanium distribution on the moon from orbital gamma ray spectrometry with implications for crustal evolutionary models

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3209d&link_type=abstract

Journal of Geophysical Research, vol. 85, June 10, 1980, p. 3209-3224.

Physics

39

Gamma Ray Spectra, Iron, Lunar Composition, Lunar Crust, Lunar Evolution, Lunar Surface, Titanium, Basalt, Ground Truth, Kreep, Lunar Geology, Lunar Maps, Lunar Maria, Lunar Rocks, Regression Analysis, Moon, Iron, Titanium, Gamma Rays, Spectrometry, Crust, Evolution, Models, Distribution, Apollo 15 Orbiter, Apollo 16 Orbiter, Chemistry, Procedure, Concentrations, Data, Maria, Regions, Maps, Highlands, Comparisons, Ages, High Titanium Mare Basalts, Kreep, Analysis, Petrogenesis, Aluminum, Landing Sites, Samp

Scientific paper

A set of Fe and Ti maps and regional values are obtained from the Apollo 15 and 16 orbital gamma ray data by energy band analysis. High-Ti basalts predominate the early and late stages of mare volcanism with high-Fe basaltic volcanism in the interim. The first evidence of a high-Ti-KREEP basalt association is found in the Aristarchus region. A N-S asymmetry for Fe and Ti in the east limb and farside highlands complicates the E-W asymmetry for Th but substantiates crustal inhomogeneity. The observed crustal inhomogeneity adds an additional objection to the primitive source model for crustal evolution. The high-Ti-KREEP basalt association and the general trend of decreasing mare basalt Ti with time lend support to the cumulate source model; however, this model cannot account for young, high-Ti maria. The dynamic assimilation model better accounts for chemical variations observed on the moon.

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