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- W2894219641 abstract "Abstract Noble gases and nitrogen were measured in two adjacent samples each from the Raghunathpura ( IIAB ) and the Nyaung ( IIIAB ) iron meteorite falls. Light noble gases in both the meteorites were of pure cosmogenic origin. Using ( 3 He/ 4 He) c ratios and the production systematic of Ammon et al. ( ), we estimated the sample depth and meteoroid size for Nyaung (~8 cm depth in a ~15 cm radius object) and Raghunathpura (~12–14 cm depth in a ~25 cm object). We derived cosmic ray exposure ages of 1710 ± 256 Ma (for Nyaung, the highest reported so far for the IIIAB group) and 224 ± 34 Ma (for Raghunathpura). Variable amounts of trapped Kr and Xe were found in both meteorites. The phase Q‐like elemental ratio ( 84 Kr/ 132 Xe) suggests that the trapped component is of indigenous origin, and most likely hosted in the heterogeneously distributed micro‐inclusions of troilite/schreibersite. Trapped phase Q component is being reported for the first time, for a IIAB iron meteorite. Both meteorites showed light isotopic composition for nitrogen, and need at least two N components to explain the observed N isotopic systematic. Variable amounts of trapped noble gases and the presence of more than one N component suggest that the magmatic process that formed the parent body of these meteorites either could not completely homogenize or completely degas all the phases." @default.
- W2894219641 created "2018-10-05" @default.
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- W2894219641 date "2018-09-23" @default.
- W2894219641 modified "2023-09-25" @default.
- W2894219641 title "Noble gases and nitrogen in Raghunathpura (IIAB) and Nyaung (IIIAB) iron meteorites" @default.
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- W2894219641 doi "https://doi.org/10.1111/maps.13195" @default.
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