Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..372a&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Physics
10
Beads, Cooling, Glass, Lunar Composition, Lunar Evolution, Lunar Rocks, Apollo 17 Flight, Drops (Liquids), Particle Size Distribution, Petrology, Rates (Per Time)
Scientific paper
Size frequency distributions of the cross sections of orange and black glass beads in the 125-250 micron fraction of soil 74220 have been determined. Cross-section medians of black vitrophyric and orange glassy beads in the 125-250 micron fraction are 0.16 mm and 0.14 mm, respectively. The vitrophyric beads contain skeletal olivine crystals mantled by ilmenite. Some beads contain fragments and euhedral crystals of endogeneous olivine. 'Free-flight' cooling rates and the critical cooling rate for crystallization have been determined with a synthetic melt of orange glass composition. The critical cooling rate is approximately 100 C/s. The 'free-flight' cooling rate of droplets 0.16 mm in diameter is approximately 1080 C/s. It is inferred that Apollo 17 orange melt droplets were erupted together with a large mass of hot gas and/or formed a dense cloud of heat-radiating droplets.
Arndt Jörg
von Engelhardt Wolf
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