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TitleA 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
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHayward, NORCID logo; Tschirhart, VORCID logo
SourceGeological Survey of Canada, Open File 8985, 2023, 18 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatreadme
File formatpdf
ProvinceNorthwest Territories
NTS85M; 85N; 86C; 86D; 86E; 86F; 86K; 86L
AreaGreat Bear Lake
Lat/Long WENS-120.0000 -116.0000 67.0000 63.0000
Subjectsgeophysics; Science and Technology; magnetic susceptibility; mineral deposits; aeromagnetic interpretation; densities; modelling; Great Bear Magmatic Zone
Illustrationslocation maps; gravity profiles
ProgramTargeted Geoscience Initiative (TGI-6) Ore systems
Released2023 07 10
AbstractThe 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. 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 proper 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.
Summary(Plain Language Summary, not published)
This report discusses a study that uses data to understand the Great Bear magmatic zone in 3D. Two software programs were used to analyze the data and compare their results. By combining the magnetic susceptibility and density results, the researchers were able to identify areas with high physical properties, which are often associated with mineral deposits. These models showed known mineral occurrences in the region and identified other areas for further study.

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