Abstract
PETROGRAPHICAL features such as multiple sets of deformation lamellae in quartz, isotropic quartz and feldspar, and characteristic microfracture patterns, are generally believed to be diagnostic of hyper-velocity impact1. These features can be produced experimentally by shock pressures of tens or hundreds of kilobars, which, it is assumed, can only be generated in nature by the hyper-velocity impact of large missiles. All these features occur in the Carswell circular structure, however, in circumstances which cast doubt on this theory.
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References
Dence, M. R., Meteoritics, 2, 249 (1964).
Short, N. M., J. Geophys. Res., 71, 4, 1195 (1966).
Innes, M. J. S., Meteoritics, 2 219 (1964).
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CURRIE, K. Shock Metamorphism in the Carswell Circular Structure, Saskatchewan, Canada. Nature 213, 56–57 (1967). https://doi.org/10.1038/213056a0
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DOI: https://doi.org/10.1038/213056a0
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