Impact glasses from the less than 20-micrometer fraction of Apollo 17 soils 72501 and 78221

Details Impact glasses from the less than 20-micrometer fraction of Apollo 17 soils 72501 and 78221 Impact glasses from the less than 20-micrometer fraction of Apollo 17 soils 72501 and 78221

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ga17.conf...44n&link_type=abstract

In Lunar Science Inst., Workshop on Geology of the Apollo 17 Landing Site p 44-45 (SEE N93-18786 06-91)

Computer Science

2

Chemical Composition, Chemical Fractionation, Condensates, Glass, Hypervelocity Impact, Lunar Soil, Meteorite Collisions, Refractories, Apollo 17 Flight, Electron Microscopy, Lunar Landing Sites, Vaporizing

Scientific paper

The chemical compositions of microscopic glasses produced during meteoroid impacts on the lunar surface provide information regarding the various fractionation processes that accompany these events. To learn more about these fractionation processes, we studied the compositions of submicrometer glass spheres from two Apollo 17 sampling sites using electron microscopy. The majority of the analyzed glasses show evidence for varying degrees of impact-induced chemical fractionation. Among these are HASP glasses (high-Al, Si-poor), which are believed to represent the refractory residuum left after the loss of volatile elements (e.g., Si, Fe, Na) from the precursor material. In addition to HASP-type glasses, we also observed a group of volatile-rich, Al-poor (VRAP) glasses that represent condensates of vaporized volatile constituents, and are complementary to the HASP compositions. High-Ti glasses were also found during the course of this study, and are documented here for the first time.

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