Grain size evolution and fractionation trends in an experimental regolith

Details Grain size evolution and fractionation trends in an experimental regolith Grain size evolution and fractionation trends in an experimental regolith

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..183h&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Physics

9

Grain Size, Impact Melts, Planetary Composition, Planetary Surfaces, Regolith, Comminution, Electron Microscopy, Gabbro, Glass, Projectiles, Stainless Steels, Targets, Moon, Samples, Lunar, Grains, Size, Evolution, Fractionation, Regolith, Experiments, Analogs, Simulations, Procedure, Comminutation, Energy, Impacts, Fracturing, Mineralogy, Composition, Chemistry, Analysis

Scientific paper

The communication of blocky planetary surfaces into fine-grained regoliths was simulated by impacting a fragmental gabbro target 200 times with stainless steel projectiles. It is found that the comminution efficiency of the surfaces changes with time, being highest in the early stages of regolith formation and decreasing gradually. The relationship between mean grain size and cumulative energy is not linear. Individual, fine-grained regolith components can be generated very early from relatively large progenitor fragments without going through intermediate-size fractions. Impact comminution is capable of producing fractionated fines as postulated by Papike et al. (1982). The role of grain-size selective, lateral transport to explain the fractionated nature of lunar regolith fines may have been overestimated in the past.

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