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    Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada

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    Author
    Spooner, I.
    Stevens, G.
    Morrow, J.
    Pufahl, P.
    Grieve, R.
    Raeside, R.
    Pilon, J.
    Stanley, C.
    Barr, S.
    McMullin, D.
    Issue Date
    2009-01-01
    Keywords
    impact craters
    shock metamorphism
    oblique Impact
    
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    Citation
    Spooner, I., Stevens, G., Morrow, J., Pufahl, P., Grieve, R., Raeside, R., ... & McMullin, D. (2009). Identification of the Bloody Creek structure, a possible impact crater in southwestern Nova Scotia, Canada. Meteoritics & Planetary Science, 44(8), 1193-1202.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656606
    DOI
    10.1111/j.1945-5100.2009.tb01217.x
    Additional Links
    https://meteoritical.org/
    Abstract
    An approximately 0.4 km diameter elliptical structure formed in Devonian granite in southwestern Nova Scotia, herein named the Bloody Creek structure (BCS), is identified as a possible impact crater. Evidence for an impact origin is based on integrated geomorphic, geophysical, and petrographic data. A near-continuous geomorphic rim and a 10 m deep crater that is infilled with lacustrine sediments and peat define the BCS. Ground penetrating radar shows that the crater has a depressed inner floor that is sharply ringed by a 1 m high buried scarp. Heterogeneous material under the floor, interpreted as deposits from collapse of the transient cavity walls, is overlain by stratified and faulted lacustrine and wetland sediments. Alteration features found only in rim rocks include common grain comminution, polymict lithic microbreccias, kink-banded feldspar and biotite, single and multiple sets of closely spaced planar microstructures (PMs) in quartz and feldspar, and quartz mosaicism, rare reduced mineral birefringence, and chlorite showing plastic deformation and flow microtextures. Based on their form and crystallographic orientations, the quartz PMs consist of planar deformation features that document shock-metamorphic pressures less than or equal to 25 GPa. The age of the BCS is not determined. The low diameter-to-depth ratio of the crater, coupled with anomalously high shock-metamorphic pressures recorded at its exposed rim, may be a result of significant post-impact erosion. Alternatively, impact onto glacier ice during the waning stages of Wisconsinian deglaciation (about 12 ka BP) may have resulted in dissipation of much impact energy into the ice, resulting in the present morphology of the BCS.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2009.tb01217.x
    Scopus Count
    Collections
    Meteoritics & Planetary Science, Volume 44, Number 8 (2009)

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