A comparison of 3-D inversion strategies in the investigation of the 3-D density and magnetic susceptibility distribution in the Great Bear magmatic zone, Northwest Territories / N. Hayward and V. Tschirhart. : M183-2/8985E-PDF

"The inversion of new compilations of aeromagnetic data and gravity data are employed to investigate the 3-D physical property (magnetic susceptibility and density) distribution within the Great Bear magmatic zone. The application of two different software suites (Geosoft VOXI and UBC GIF MAG3D and GRAV3D) affords a comparison of approaches and results. The magnetic susceptibility results are broadly compatible, but Geosoft VOXI enabled more detailed definition of shallow sources, due to the lower upward continuation required for a resulting smooth model. The density results were markedly different in how the model responded to the low-resolution gravity data, in characterization of the near-surface. GRAV3D extrapolated shallow sources to surface, whereas Geosoft VOXI smoothed and closed the top of shallow sources below surface. The different magnetic susceptibility and density models can be used to assess the physical property distribution and relationships across the region. One approach, applied here, is to combine the near-surface magnetic susceptibility and density results to identify zones of coincidently high physical properties, a common physical property relationship associated with IOCG mineral deposits. These integrated models highlight many of the region's known mineral occurrences and reveal other zones for further analysis"--Abstract, page 1.

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