Noble gases and nitrogen in metal from the ordinary chondrites Katol (L6), Itawa Bhopji (L3-5) and Portales Valley (H6)

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Ramakant R. Mahajan

Astrophysics and Space Science, Volume 365, Article number: 130 (2020)

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“This is the first report of coupled noble gases (He, Ne, Ar, Kr and Xe) and nitrogen isotopic results in metal separates from the ordinary chondrites Katol (L6), Itawa Bhopji (L3-5) and Portales Valley (H6). Noble gas elemental ratios (corrected for cosmogenic) in the metal separates are mixture of several components, Q-gas, air and solar wind. The chondritic metal shows new nitrogen isotopic data, with N abundances in the range of 0.19 to 5.62 ppm and distinct isotopic signatures. Nitrogen composition observed in metal separates is inconsistent with the solar wind (SW) and Q-gas. 15N enriched nitrogen is exhibited in metal separates compared to the SW and Q-gas. In metal separates, no systematics correlation was observed between the amounts and trapped nitrogen isotopic ratios. Nitrogen isotopic ratios found in the metal separates indicate an origin from local affects that occurred on the parent body. The elemental ratios of nitrogen and noble gases in the metal separates are within the range observed in the bulk meteorites, but distinct compared to the SW and Q-gas.”

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