Seismic reflectivity of the Sudbury Structure North Range from borehole logs

Details Seismic reflectivity of the Sudbury Structure North Range from borehole logs Seismic reflectivity of the Sudbury Structure North Range from borehole logs

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..935w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 10, p. 935-938

Mathematics

Logic

10

Boreholes, Geological Surveys, Geophysics, Igneous Rocks, Imaging Techniques, Lithology, Mineral Deposits, Petrography, Seismic Waves, Structural Basins, Structural Properties (Geology), Wave Reflection, Breccia, Earth Crust, Gabbro, Mineral Exploration, Quartz

Scientific paper

Results from borehole geophysical logs, full waveform sonic logs, VSP and laboratory core sample measurements indicate that lithologic variations within the Sudbury Igneous Complex (SIC) and footwall rocks are the primary cause of reflections observed regionally on the multi-channel seismic reflection profiles. The effects of macroscopic fracturing and low-grade alteration on the seismic response are only important to a depth of approximately 320 m. The major lithologic units of the SIC and footwall rocks in the North Range of the Sudbury structure have contrasting physical properties: Felsic norite and quartz-gabbro have higher V(sub p) (approximately 6300 m/s) than granophyre (approximately 6000 m/s) due to their higher pyroxene content and the presence of quartz rather than calcic plagioclase in the granophyre. Velocities are higher (V(sub p) approximately = 6500 m/s) within the brecciated footwall rocks due to an overall increase in mafic mineral content. The contrasting velocities and densities of these units imply that the granophyre/quartz-gabbro contact and the SIC/footwall transition can be mapped regionally using seismic reflection methods. Subunits within these units are also highly reflective, consistent with the nature of the seismic data, but are likely discontinuous laterally.

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