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    In situ survey of graphite in unequilibrated chondrites: Morphologies, C, N, O, and H isotopic ratios

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    Author
    Mostefaoui, S.
    Zinner, E.
    Hoppe, P.
    Stadermann, F. J.
    El Goresy, A.
    Issue Date
    2005-01-01
    Keywords
    Isotopic ratios
    solar system
    Interstellar molecular cloud
    graphite
    
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    Citation
    Mostefaoui, S., Zinner, E., Hoppe, P., Stadermann, F. J., & El Goresy, A. (2005). In situ survey of graphite in unequilibrated chondrites: Morphologies, C, N, O, and H isotopic ratios. Meteoritics & Planetary Science, 40(5), 721-743.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655999
    DOI
    10.1111/j.1945-5100.2005.tb00976.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We performed in situ morphological and isotopic studies of graphite in the primitive chondrites Khohar (L3), Mezö-Madaras (L3), Inman (L3), Grady (H3), Acfer 182 (CH3), Acfer 207 (CH3), Acfer 214 (CH3), and St. Marks (EH5). Various graphite morphologies were identified, including book, veins, fibrous, fine-grained, spherulitic, and granular graphite, and cliftonite. SIMS measurements of H, degrees C, N, and O isotopic compositions of the graphites revealed large variations in the isotopic ratios of these four elements. The delta-15N and delta-13C values show significant variations among the different graphite types without displaying any strict correlation between the isotopic composition and morphology. In the Khohar vein graphites, large 15N excesses are found, with delta-15Nmax ~+955 ppm, confirming previous results. Excesses in 15N are also detected in fine-grained graphites in chondrites of the CH clan, Acfer 182, Acfer 207, and Acfer 214, with delta-15N ranging up to +440 ppm. The 15N excesses are attributed to ion-molecule reactions at low temperatures in the interstellar molecular cloud (IMC) from which the solar system formed, though the largest excesses seem to be incompatible with the results of some recent calculation. Significant variations in the carbon isotopic ratios are detected between graphite from different chondrite groups, with a tendency for a systematic increase in delta-13C from ordinary to enstatite to carbonaceous chondrites. These variations are interpreted as being due to small-and large-scale carbon isotopic variations in the solar nebula.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2005.tb00976.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 40, Number 5 (2005)

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