A unique glimpse into asteroidal melting processes in the early solar system from the Graves Nunatak 06128/06129 achondrites

C. K. Shearer, P. V. Burger, C. R. Neal, Z. Sharp, L. E. Borg, L. Spivak-Birndorf, M. Wadhwa, J. J. Papike, J. M. Karner, A. M. Gaffney, J. Shafer, B. P. Weiss, J. Geissman, V. A. Fernandes

    Research output: Contribution to journalLetterpeer-review

    Abstract

    The recently recovered Antarctic achondrites Graves Nunatak 06128 and 06129 are unique meteorites that represent high-temperature asteroidal processes in the early solar system never before identified in any other meteorite. They represent products of early planetesimal melting (4564.25 ± 0.21 Ma) and subsequent metamorphism of an unsampled geochemical reservoir from an asteroid that has characteristics similar to the brachinite parent body. This melting event is unlike those predicted by previous experimental or geochemical studies, and indicates either disequilibrium melting of chondritic material or melting of chondritic material under volatile-rich conditions.

    Original languageEnglish
    Pages (from-to)1937-1940
    Number of pages4
    JournalAmerican Mineralogist
    Volume93
    Issue number11-12
    DOIs
    Publication statusPublished - 1 Nov 2008

    Keywords

    • Achondrites
    • Al-Mg chronometer
    • Asteroids
    • Brachinites
    • Planetesimal melting

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