Petrology and mineral chemistry of new ureilites found in Grove Mountains, Antarctica |
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| Authors: | Bingkui Miao Yangting Lin Guiqin Wang Daode Wang Ziyuan Ouyang |
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| Institution: | a) Department of Resources and Environment Engineering, Guilin University of Technology, Guilin 541004, China b) State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China c) Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China d) National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China |
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| Abstract: | Petrography and mineral chemistry of two new ureilites, GRV021512 and GRV022931, 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 origin of diamond are discussed. |
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| Keywords: | meteorite achondrite ureilite diamond Antarctica |
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