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    Constraints on central uplift structure from the Manicouagan impact crater

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    Author
    Spray, J. G.
    Thompson, L. M.
    Issue Date
    2008-01-01
    Keywords
    complex Craters
    Manicouagan Impact Crater
    Quebec
    Canada
    Impact tectonics
    impact melting
    
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    Citation
    Spray, J. G., & Thompson, L. M. (2008). Constraints on central uplift structure from the Manicouagan impact crater. Meteoritics & Planetary Science, 43(12), 2049-2057.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656507
    DOI
    10.1111/j.1945-5100.2008.tb00660.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Recent drilling operations at the 90 km diameter, late Triassic Manicouagan impact crater of Quebec, Canada, have provided new insight into the internal structure of a complex craters central region. Previous work had indicated that the impact event generated a ~55 km diameter sheet of molten rock of relatively consistent (originally ~400 m) thickness (Floran et al. 1978). The drilling data reveals melt sheet thicknesses of up to ~1500 m, with kilometer-scale lateral and substantial vertical variations in the geometry of the crater floor beneath the melt sheet. The thickest melt section occurs in a 1500 m deep central trough encircled by a horseshoe-shaped uplift of Precambrian basement. The uplift constitutes a modified central peak structure, at least part of which breached the melt sheet. Mineralogical and compositional segregation (differentiation) of the thicker melt sheet section, coupled with a lack of fractionation in the thinner units, shows that the footwall geometry and associated trough structure were in place prior to melt sheet solidification. Marked lateral changes in sub-melt sheet (basement) relief support the existence of a castellated footwall that was created by high-angle, impact-related offsets of 100s to 1000s of meters. This indicates that deformation during the modification stage of the cratering process was primarily facilitated by large-displacement fault systems. This work suggests that Manicouagan is a central peak basin with rings, which does not appear to fit with current complex crater classification schemes.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2008.tb00660.x
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    Meteoritics & Planetary Science, Volume 43, Number 12 (2008)

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