1. Petrology and mineral chemistry of new ureilites found in Grove Mountains, Antarctica
- Author
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Miao, Bingkui, Lin, Yangting, Wang, Guiqin, Wang, Daode, and Ouyang, Ziyuan
- Subjects
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PETROLOGY , *ROCK-forming minerals , *MOUNTAINS , *METEORITES , *ACHONDRITES - Abstract
Abstract: Petrography and mineral chemistry of two new ureilites, GRV 021512 and 022931, from the Grove Mountains, Antarctica, are reported in this paper. GRV 021512 exhibits a typical ureilite texture, and consists of 48.3% olivine, 9.4% pigeonite and 38.1% carbonaceous interstitial material and/or reduction product. GRV 022931 has a cataclastic porphyritic texture, and consists of 19.1% olivine and 14.1% pigeonite embedded in 66.3% carbonaceous interstitial material and/or reduction product. The coarse-grained olivine and pigeonite in both meteorites have homogeneous cores, and they are FeO-rich within the range of the ferroan subgroup (subgroup I) of olivine-pigeonite ureilites. All olivine grains of the meteorites show reduction zones along boundaries and cracks. Abundant diamond coexists with graphite as graphite-rich patches and veins in the carbonaceous interstitial material. Petrogenesis of both meteorites and the origin of diamond are discussed. [Copyright &y& Elsevier]
- Published
- 2008
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