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    Shocked quartz grains in the polymict breccia of the Granby structure, Sweden—Verification of an impact

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    Author
    Alwmark, C.
    Issue Date
    2009-01-01
    Keywords
    shock metamorphism
    Impact crater Granby
    terrestrial craters
    Sweden
    
    Metadata
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    Citation
    Alwmark, C. (2009). Shocked quartz grains in the polymict breccia of the Granby structure, Sweden—Verification of an impact. Meteoritics & Planetary Science, 44(8), 1107-1113.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656599
    DOI
    10.1111/j.1945-5100.2009.tb01210.x
    Additional Links
    https://meteoritical.org/
    Abstract
    The Middle Ordovician Granby structure in Sweden is generally considered the result of an asteroidal or cometary collision with Earth, although no hard evidence, i.e., shock metamorphic features or traces of the impactor, have been presented to date. In this study, drill core samples of a sedimentary breccia from the Granby structure have been investigated for microscopic shock metamorphic evidence in an attempt to verify the impact genesis of the structure. The finding of multiple sets of decorated planar deformation features (PDFs) in quartz grains in these samples provides unambiguous evidence that the structure is impact derived. Furthermore, the orientation of the PDFs, e.g., omega {1013}, pi {1012} and r, z {1011}, is characteristic for impact deformation. The fact that a majority of the PDFs are decorated implies a water-bearing target. The shocked quartz grains can be divided into two groups; rounded grains found in the breccia matrix likely originated from mature sandstone, and angular grains in fragments from crystalline target rocks. The absence of melt particles provides an estimated maximum shock pressure for the sedimentary derived quartz of 15-20 GPa and the frequency distribution of PDF orientations in the bedrock quartz implies pressures of the order of 10 GPa.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2009.tb01210.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 44, Number 8 (2009)

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