Surface Features on Glass Spherules from the Luna 16 Sample

Details Surface Features on Glass Spherules from the Luna 16 Sample Surface Features on Glass Spherules from the Luna 16 Sample

Sep 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972moon....5..436h&link_type=abstract

The Moon, Volume 5, Issue 3-4, pp. 436-446

Physics

5

Scientific paper

Two ellipsoidal spherules approximately 0.5 mm in diameter were studied in detail using a scanning electron microscope. A variety of surface features were observed: vesicles, mounds, dimples, streaks, ridges, grooves, accretion phenomena, and high-speed impact craters. The diameters of 27 glass-lined pits formed by impact on one spherule range from less than 1μm to approximately 50μm. Intermediate-sized glass-lined pits surrounded by concentric fractures demonstrate the transition between larger craters that have both a pit and a spall zone and generally smaller craters that have only a pit. Assuming all craters showing evidence of impact-related melting or flow are the result of primary impacts, the differential mass spectrum of impacting meteoroids in the range 10-11 to 10-10 g is in good agreement with a spectrum based on satellite-borne particle-detecting experiments.

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