Microcrater investigations on lunar rock 12002Relative ages of 26 submillimeter-sized pits from an equilibrium population in rock 12002 were measured by determining the densities of pits 0.7 microns in diameter and larger on the submillimeter-sized pits. Production rates for 0.7 micron diameter pits were determined from solar-flare track exposure age measurements, and the data for rock 12002 are consistent with previously obtained data for sample 15205 if a lower meteoroid flux prevailed in the past. Metal mounds or spherules within a microcrater pit glass were found to have a meteoritic composition, and an impact lining consisting of protruding crystals was observed. The crystals apparently developed during exposure to space immediately after the 200-micron diameter pit was formed by impact into an olivine grain.
Document ID
19780062898
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hartung, J. B. (State Univ. of New York Stony Brook, NY, United States)
Hodges, F. (New York, State University Stony Brook, N.Y., United States)
Horz, F. (NASA Johnson Space Center Geology and Geophysics Branch, Houston, Tex., United States)
Storzer, D. (Museum National d'Histoire Naturelle Paris, France)