00000nam 2200000zi 4500 9.923948 CaOODSP 20251031142448 m o d f cr mn||||||||| 230615t20232023oncab ob f000 0 eng d 9780660491493 CaOODSP eng rda CaOODSP n-cn-nt M183-2/8985E-PDF Hayward, N. (Nathan) author. 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. [Ottawa] : Geological Survey of Canada, 2023. ©2023 1 online resource (18 pages) : colour illustrations, maps (some colour). text txt rdacontent computer c rdamedia online resource cr rdacarrier Open file, 2816-7155 ; 8985 Includes bibliographical references (pages 14-18). "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. Magnetic anomalies Northwest Territories. Gravity anomalies Northwest Territories. Inversion (Geophysics) Anomalies magnétiques Territoires du Nord-Ouest. Anomalies de la pesanteur Territoires du Nord-Ouest. Inversion (Géophysique) Geological Survey of Canada, issuing body. Open file (Geological Survey of Canada) 8985. (CaOODSP)9.506878 PDF 24.24 MB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8985-eng.pdf (report) HTML N/A https://doi.org/10.4095/331954 (complete dataset)