| Title | Three-dimensional forward modelling and inversion of magnetotelluric data using unstructured meshes for understanding realistic geological systems: method development, algorithms and model construction for
the Lalor deposit, Manitoba |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Ansari, S M; Craven, J A; Schetselaar, E |
| Source | Targeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 217-234, https://doi.org/10.4095/313656  Open Access |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative: 2018 report of activities |
| File format | pdf |
| Province | Manitoba |
| NTS | 63K/16 |
| Area | Snow Lake |
| Lat/Long WENS | -100.2000 -100.1000 54.9000 54.8500 |
| Subjects | economic geology; geophysics; structural geology; stratigraphy; mineral deposits; base metals; volcanogenic deposits; sulphide deposits; mineral exploration; prospecting techniques; modelling;
geophysical interpretations; magnetotelluric interpretations; electrical resistivity; conductivity; bedrock geology; structural features; faults; faults, thrust; lithostratigraphy; Archean; Lalor Deposit; Methodology; Precambrian;
Proterozoic |
| Illustrations | cross-sections; 3-D models; plots; geoscientific sketch maps; graphs; models |
| Program | Targeted Geoscience Initiative (TGI-5) Knowledge Management Coordination |
| Program | Targeted Geoscience Initiative (TGI-5) Volcanogenic massive sulphide ore systems - base metal sources and processes |
| Released | 2019 03 01 |
| Abstract | The work presented here covers three major branches of geophysical prospecting including the development of model construction routines for realistic subsurface structures, forward modelling and
magnetotelluric inversion strategies. Using a combination of tools, a routine is developed that produces a sealed model using tessellated geological surfaces representing lithostratigraphic contacts between rock units of the Lalor VMS deposit. This
model is suitable for generating volumetric tetrahedral meshes required for mesh-based modelling and inversion of geophysical data. A finite-element based forward modelling technique is developed that discretizes the magnetotelluric problem on
un-structured tetrahedral meshes. These meshes are suitable for producing realistic complex-shaped features. Magnetotelluric responses for the Lalor model are successfully calculated. A model space minimum-structure inversion is developed that is
based on the iterative Gauss-Newton approach using sensitivity matrix-vector products calculated implicitly by finite-element based forward and pseudo-forward solutions. |
| Summary | (Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of
buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from
their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore
systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the
research activities currently being conducted under the auspices of TGI. |
| GEOSCAN ID | 313656 |
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