Re-definition of "El Taco Xe" based on 132Xe-normalized data. Multiple primordial components in IAB irons.

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  • Maruoka Teruyuki
    Department of Earth and Space Science, Graduate School of Science, Osaka University

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The “El Taco Xe” trapped in graphite fractions of the El Taco IAB iron meteorite proposed by Mathew and Begemann (1995) was reexamined on the basis of the data normalized to 132Xe. On the Xe three-isotope diagrams, their data did not form a clear linear trend between atmospheric Xe and “El Taco Xe” due to the existence of Xe-HL in the samples. The Xe-HL released at high-temperature demands a slight modification of “El Taco Xe” by subtracting Xe-HL. The modified El Taco Xe proposed in this study can be explained by a mass-fractionation from solar Xe or U-Xe. High temperature data could be explained by the addition of a Q-HL mixture with a constant Q/HL ratio of ∼5 to the modified El Taco Xe.

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