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    Shock re-equilibration of fluid inclusions in crystalline basement rocks from the Ries crater, Germany

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    Author
    Elwood Madden, Megan E.
    Kring, David A.
    Bodnar, Robert J.
    Issue Date
    2006-01-01
    Keywords
    impact craters
    fluid inclusions
    impact processes
    Ries
    Germany Impact crater
    
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    Citation
    Elwood Madden, M. E., Kring, D. A., & Bodnar, R. J. (2006). Shock re‐equilibration of fluid inclusions in crystalline basement rocks from the Ries crater, Germany. Meteoritics & Planetary Science, 41(2), 247-262.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656103
    DOI
    10.1111/j.1945-5100.2006.tb00208.x
    Additional Links
    https://meteoritical.org/
    Abstract
    This study examines the effects of shock metamorphism on fluid inclusions in crystalline basement target rocks from the Ries crater, Germany. The occurrence of two-phase fluid inclusions decreases from shock stage 0 to shock stage 1, while single-phase inclusions increase, likely as a result of re-equilibration. In shock stages 2 and 3, both two-phase and single-phase inclusions decrease with increasing shock stage, indicating that fluid inclusion vesicles are destroyed due to plastic deformation and phase changes in the host minerals. However, quartz clasts entrained in shock stage 4 melts contain both single-phase and two-phase inclusions, demonstrating the rapid quenching of the melt and the heterogeneous nature of impact deformation. Inclusions in naturally shocked polycrystalline samples survive at higher shock pressures than those in single crystal shock experiments. However, fluid inclusions in both experimental and natural samples follow a similar trend in re-equilibration at low to moderate shock pressures leading to destruction of inclusion vesicles in higher shock stages. This suggests that shock processing may lead to the destruction of fluid inclusions in many planetary materials and likely contributed to shock devolatilization of early planetesimals.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2006.tb00208.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 41, Number 2 (2006)

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