th Lunar and Planetary Science Conference ( 2009 )

Introduction: Equilibrated lithic clasts in unequilibrated chondrites probably represent thermal metamorphism in the early solar system before or during accretion of chondritic parent bodies. Lithic clasts with equilibrated features are rare in unequilibrated chondrites and their origins are not well-understood [1]. Recently, we observed an unusual lithic clast with thermal-metamorphosed features in Grove Mountains (GRV) 021536, a new CM2 chondrite found by the Chinese Antarctic Meteorite Exploration Team [2]. Here, we report its petrography, mineralogy, oxygen isotopes, and discuss their implications.