| Title | 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 |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Hayward, N ;
Tschirhart, V |
| Source | Geological Survey of Canada, Open File 8985, 2023, 18 pages, https://doi.org/10.4095/331954  Open Access |
| Image |  |
| Year | 2023 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | digital; on-line |
| File format | readme
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| File format | pdf |
| Province | Northwest Territories |
| NTS | 85M; 85N; 86C; 86D; 86E; 86F; 86K; 86L |
| Area | Great Bear Lake |
| Lat/Long WENS | -120.0000 -116.0000 67.0000 63.0000 |
| Subjects | geophysics; Science and Technology; magnetic susceptibility; mineral deposits; aeromagnetic interpretation; densities; modelling; Great Bear Magmatic Zone |
| Illustrations | location maps; gravity profiles |
| Program | Targeted Geoscience Initiative (TGI-6) Ore systems |
| Released | 2023 07 10 |
| Abstract | 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. 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. |
| GEOSCAN ID | 331954 |
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