Integrated investigation of the mixed origin of lunar sample 72161,11

Details Integrated investigation of the mixed origin of lunar sample 72161,11 Integrated investigation of the mixed origin of lunar sample 72161,11

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...14..129b&link_type=abstract

(Lunar Science Institute, Conference on Interactions of the Interplanetary Plasma with the Modern and Ancient Moon, Lake Geneva,

Mathematics

3

Agglutination, Lunar Soil, Petrography, Carbon, Chemical Analysis, Concentration (Composition), Hydrogen, Lunar Surface, Mathematical Models, Methane, Particle Size Distribution, Pyrolysis, Statistical Analysis

Scientific paper

The comminution-agglutination model and the solar-wind implantation-retention model are used to postulate the origins of the particulate components of lunar sample (72161,11), a submillimeter fraction of a surface sample for the dark mantle regolith at LRV-3. Grain-size analysis was performed by wet sieving with liquid argon, and analyses for CO2, CO, CH4, and H2 were carried out by stepwise pyrolysis in a helium atmosphere. The results indicate that the present sample is from a mature regolith, but the agglutinate content is only 30% in the particle-size range between 90 and 177 microns, indicating an apparent departure from steady state. Analyses of the carbon, methane, and hydrogen concentrations in size fractions larger than 149 microns show that the volume-correlated component of these species increases with increased grain size. It is suggested that the observed increase can be explained in terms of mixing of a dominant local population of coarser agglutinates having high carbon and hydrogen concentrations with an imported population of finer agglutinates relatively poor in carbon and hydrogen.

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