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Coordinated Analyses of Presolar Grains in the Allan Hills 77307 and Queen Elizabeth Range 99177 Meteorites

ASTROPHYSICAL JOURNAL, no. 1 (2010): 166-189

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We report the identification of presolar silicates (similar to 177 ppm), presolar oxides (similar to 11 ppm), and one presolar SiO2 grain in the Allan Hills (ALHA) 77307 chondrite. Three grains having Si-isotopic compositions similar to SiC X and Z grains were also identified, though the mineral phases are unconfirmed. Similar abundances ...更多

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