| Title | Faults affecting the northeast Thelon Basin: improved basement constraints from source edge processing of aeromagnetic data |
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| Author | Tschirhart, V ;
Morris, B; Jefferson, C |
| Source | Exploration and Mining Geology vol. 21, 2013 p. 105-113 |
| Links | Online - En ligne
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| Image |  |
| Year | 2013 |
| Alt Series | Earth Sciences Sector, Contribution Series 20140500 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Nunavut |
| NTS | 66B; 66C; 66F; 66G |
| Lat/Long WENS | -100.2500 -98.2500 65.5000 64.2500 |
| Subjects | structural geology; economic geology; geophysics; aeromagnetic surveys; aeromagnetic interpretation; structural features; faults; uranium; mineralization; Thelon Basin |
| Illustrations | location maps; geophysical images |
| Released | 2013 01 01 |
| Abstract | A new method for mapping faults within basement rocks underlying the Thelon Formation and glacial overburden was developed and tested in the Aberdeen Sub-basin. This method utilizes newly acquired
aeromagnetic data, the Blakely algorithm for defining magnetic source edges, a calculated dip-direction map, a digital elevation model (DEM) derived from the Canadian Digital Elevation Database, and the positions of identified, inferred and newly
mapped faults that are within and adjacent to this sub-basin. Combining these data revealed three age groups of faults. One group is seen only on the DEM; these faults are young brittle structures that have no effect on the sub-Thelon basement
unconformity, and are not visible on the dip direction map. A second group is evident on the dip direction map but not the DEM; these faults are old basement structures that did not propagate upward through the Thelon Formation. The third group is
expressed on both the DEM and dip direction map; these faults are also old structures that propagated upward during and/or after deposition of the Thelon Formation. The latter group of faults may be of greatest interest for uranium exploration, with
reactivation increasing their potential to serve as conduits to transport uranium-rich fluids and focus deposition at or near the unconformity surface. This methodology has promise for comprehensive mapping of basin faults and tracking the tectonic
development of the whole Thelon Basin through time. |
| GEOSCAN ID | 296075 |
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