A completely new analysis has been carried out on the data from the Apollo 15 and 16 gamma ray spectrometer experiments. The components of the continuum background have been estimated. The elements Th, K, Fe and Mg give useful results; results for Ti are significant only for a few high Ti regions. Errors are given, and the results are checked by other methods. Concentrations are reported for about sixty lunar regions; the ground track has been subdivided in various ways. The borders of the maria seem well-defined chemically, while the distribution of KREEP is broad. This wide distribution requires emplacement of KREEP before the era of mare formation. Its high concentration in western mare soils seems to require major vertical mixing.
Surface chemistry of selected lunar regions
Lunar Sci. Conf. on Util. of Lunar Mater. and Expertise for Large Scale Operations in Space ; 1976 ; Houston, TX, United States
1976-01-01
Aufsatz (Konferenz)
Keine Angabe
Englisch
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