Surface features on glass spherules from the Luna 16 sample |
| |
Authors: | Jack B. Hartung Friedrich Hörz David S. McKay Frank L. Baiamonte |
| |
Affiliation: | (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 1m to approximately 50m. 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|