Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..955m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 10, p. 955-958
Mathematics
Logic
8
Density Distribution, Geological Surveys, Geomagnetism, Geomorphology, Gravitational Fields, Igneous Rocks, Lithology, Magnetic Anomalies, Models, Structural Basins, Structural Properties (Geology), Geophysics, Mineral Exploration, Seismic Waves, Wave Reflection
Scientific paper
Previous gravity models of the Sudbury Structure (1850 Ma) were constrained by surface geology, and by density measurements of surface and borehole rock samples. Recent high-resolution seismic reflection data provide additional constraints for modeling new gravity observations made along the Sudbury Lithoprobe transect. Results indicate, (1) density distributions constrained by the seismic data yield calculated gravity values matching the Bouguer gravity data, (2) the main sources of gravitational disturbance are external to the Sudbury Structure, (3) the positive gravity anomaly trend south of the Sudbury Structure is associated with mafic rocks of Proterozoic age, and (4) the large, ramplike, gravity anomaly paralleling the northwest margin of the Sudbury Structure is an expression of a northward dipping boundary within the Archean basement. The presence of a hidden mafic layer beneath the Sudbury Structure is not required to model the Bouguer gravity data. An enigma is an 8 mGal, positive, gravity anomaly over the south central Sudbury Structure.
Broome H. J.
McGrath P. H.
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