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    Carbon isotope fractionation between graphite and diamond during shock experiments

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    Author
    Maruoka, T.
    Koeberl, C.
    Matsuda, J.
    Syono, Y.
    Issue Date
    2003-01-01
    Keywords
    Ureilite diamonds
    Shock-produced diamond
    impact cratering
    
    Metadata
    Show full item record
    Citation
    Maruoka, T., Koeberl, C., Matsuda, J. I., & Syono, Y. (2003). Carbon isotope fractionation between graphite and diamond during shock experiments. Meteoritics & Planetary Science, 38(8), 1255-1262.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655738
    DOI
    10.1111/j.1945-5100.2003.tb00311.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Carbon isotopic compositions were measured for shock-produced diamond and shocked graphite formed at peak pressures ranging from 37 to 52 GPa. The delta-13C values of diamonds produced in a sealed container were generally lower than that of the initial graphite. The differences in the carbon isotopic composition between initial graphite and shocked graphite/diamond may reflect kinetic isotopic fractionation during the oxidation of the graphite/diamond and/or analytical artifacts possibly induced by impurities in the samples. The pressure effect on the isotopic fractionations between graphite and diamond can be estimated from the delta-13C values of impurity-free diamonds produced using a vented container from which gases, including oxygen, in pore spaces escaped during or after the diamond formation (e.g., 0.039 +/- 0.085 at a peak pressure of 52 GPa). Any isotopic fractionation induced by shock conversion of graphite to diamond is too small to be detected in natural shock-induced diamond-graphite systems related to terrestrial impact cratering processes.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2003.tb00311.x
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    Meteoritics & Planetary Science, Volume 38, Number 8 (2003)

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