Exposure Histories of Lunar Meteorites Northwest Africa 032 and Dhofar 081.

摘要

Recent additions to the list of lunar meteorites include Northwest Africa (NWA) 032 and Dhofar 081. NWA 032 is an unbrecciated basalt, found in Morocco; Dhofar 081 is a fragmented feldspathic breccia, found in Oman. The goal is the determination of the cosmic ray exposure history of these objects. Most lunar meteorites have complex cosmic ray exposure histories, having been exposed both at some depth on the lunar surface before their ejection and as small bodies in space during transport from the moon to the earth. These exposures were then followed by residence on the earth's surface, the terrestrial residence time.