Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278...85t&link_type=abstract
Solar System Remote Sensing, p. 85
Other
Iron, Particulates, Agglutination, Lunar Soil, Sputtering, Vapor Deposition, Meteorite Collisions, Micrometeorites
Scientific paper
It has become accepted lore that the myriad of grains of nanophase Fe(sup 0) (abbrev. npFe(sup 0)) in lunar agglutinates are the result of 'auto-reduction of impact-melted lunar soil in the presence of solar-wind hydrogen'. However, recent studies have demonstrated other sources of npFe(sup 0) in lunar soils, as present in thin patinas (approx. 0.1 micron) on the surfaces of most soil particles. The major portion of this npFe(sup 0) formed by deposition of vapor produced by abundant micrometeorite impacts, as documented by the presence of multiple and overlapping patinas. A smaller portion may have formed by radiation sputtering. The vapor deposition of this patina npFe(sup 0) is not actually at the surface, sensu stricto, but just below. It would appear that the presence of npFe(sup 0) in the vapor-deposited patinas (rims) on virtually all grains of a mature soil provides an additional and abundant source for the greatly increased Is/Fe(sup 0) values observed. [At this point, I would like to see just how red with fury Bruce's face must be, as the above statements appear to steal his 'I told you so's.'.] You see, it was Bruce and his Pittsburgh colleagues that had astutely predicted all this way back in the Apollo days, but its significance went largely overlooked for decades. For an elegant and thorough review, albeit with a bit of bias, please read Hapke.
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