【标题】Grove Mountains (GRV) 024237: A New Ureilite from Antarctica
【Title】Grove Mountains (GRV) 024237: A New Ureilite from Antarctica
【Abstract】Ureilite, a special group of achondrites, has both the characteristics of differentiated meteorites and those of primary chondrites. GRV 024237 is an ureilite which was found in the 19th Chinese Antarctic Research Expedition (CHINARE), at the No.4 moraine, Grove Mountains, Antarctica. GRV 024237 mainly consists of coarse granular assemblages of olivine (60 vol%), pigeonite (30 vol%) and opaque mineral (10 vol%). Black grain boundaries are filled by carbonaceous material with a trace of troilite and nickel-iron metal, and 120°junctions are common. The Fa of olivine composition varies from 6.2 to 16.77 from its rim to core, but pyroxene is uniform in composition with Fs 14.0 to 15.5. The opaque phases are mainly graphite, troilite and Fe-Ni metal. GRV 024237 has normal extinction, net-like iron or limonite veins, no diamond and moderate FeO /MgO（Fo 84.8/Fa15.2）ratio. According to different model for sub-group classification, GRV 024237 is a typical monomict ureilite，and it belongs type I and group 2.