A New Source of Basaltic Meteorites Inferred from Northwest Africa 001

摘要

Eurcites are a class of basaltic meteorites that share common mineralogical, isotopic, and chemical properties and are thought to have been derived from the same parent body, possibly asteroid 4 Vesta. The texture, mineralogy, and noble gas data of the recently recovered meteorite, Northwest Africa (NWA) 011, are similar to those of basaltic eucrites. However, the oxygen isotopic composition of NWA011 is different form that of other eucrites, indicating that NWA011 may be derived form a different parent body. The presence of basaltic Meteorites with variable oxygen isotopic composition suggests the occurrence Of multiple basaltic meteorite parent bodies, perhaps similar to 4 Vesta, in the Early solar system.