Shock attenuation at the Slate Islands revisited

Details Shock attenuation at the Slate Islands revisited Shock attenuation at the Slate Islands revisited

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1543w&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1543-1544 (SEE N94-20636 05-91

Other

Cratering, Impact Loads, Metamorphism (Geology), Meteorite Craters, Quartz, Radial Distribution, Shatter Cones, Shock Loads, Breccia, Deformation, Lake Superior, Meteoritic Damage, Petrology, Rock Intrusions

Scientific paper

This study of a more extensive suite of Slate Islands samples confirms previous interpretations. It indicates clearly that recorded shock pressures, as determined by planar deformation feature orientations, increased towards the center. The 'shock center' is very close (considering the structural movements during cavity modification) to that from an independent determination from shatter cone orientations. Shock metamorphism at a higher level in breccia clasts than in the adjacent country rocks is evidence that the shock event preceded the formation of the breccia dikes. These observations, which are consistent with those at other impact structures, are all contrary to the interpretation by Sage that breccia dike formation by diatreme action was the source of the shock event. There is no plausible reason to consider the Slate Islands as anything but the emergent portion of the central uplift of a complex impact crater. It cannot be cited as an example of endogenic shock in arguments regarding evidence of impact in the terrestrial stratigraphic record.

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