Seismic imaging of the enigmatic Sudbury Structure

Details Seismic imaging of the enigmatic Sudbury Structure Seismic imaging of the enigmatic Sudbury Structure

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.4117w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. B3, p. 4117-4130

Mathematics

Logic

23

Geological Faults, Igneous Rocks, Image Processing, Petrology, Planetary Craters, Seismic Waves, Seismograms, Structural Basins, Structural Properties (Geology), Tectonics, Copper, Imaging Techniques, Meteorite Craters, Nickel, Sediment Transport, Wave Reflection

Scientific paper

The Sudbury Structure on the southern margin of the Superior craton was created by a catastrophic explosion in 1.85 Ga and hosts one of the world's largest Ni-Cu reserves. As a unique terrestrial geological feature, its genesis has been vigorously debated for more than a century. In an effort to optimize the image from seismic reflection data acquired across the center of the Sudbury Structure, we have developed a straight-line common midpoint binning strategy and employed cross-dip directions. These pseudo-three-dimensional seismic processing techniques, coupled with standard processing methods, have overcome limitations associated with conventional two-dimensional seismic data processing and have substantially enhanced the seismic image, warranting a more detailed and reliable structural interpretation. The new image has revealed a major, previously unrecognized, zone of imbricated NW thrusts. Interpretation of these thrusts provides critical timing constraints relating the Sudbury tectonic deformation to deposition of the Sudbury Basin sediments.

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