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Surface features on glass spherules from the Luna 16 sample
Authors:Jack B Hartung  Friedrich Hörz  David S McKay  Frank L Baiamonte
Institution:(1) NASA Manned Spacecraft Center, Houston, Tex., USA
Abstract: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 1mgrm to approximately 50mgrm. 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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