|Title||Seismic reflection profiling: an effective exploration tool in the Athabasca Basin? An interim assessment|
|Author||White, D J; Roberts, B; Mueller, C; Hajnal, Z; Gyorfi, I; Reilkoff, B; Koch, R; Powell, B|
|Source||Summary of investigations 2002, volume 2, Saskatchewan Geological Survey; 2002, 7 pages|
|Links||Online - En ligne|
|Alt Series||Geological Survey of Canada, Contribution Series 2002147|
|Media||paper; on-line; digital|
|NTS||64E; 64L; 64M; 74E; 74F; 74G; 74H; 74I; 74J; 74K; 74L; 74M; 74N; 74O; 74P|
|Lat/Long WENS||-111.3333 -103.2000 59.4167 57.0667|
|Subjects||geophysics; economic geology; sedimentology; metallic minerals; paleotopography; seismic reflection surveys; basins; sedimentary basins; mineral deposits; uranium; mineral exploration; sedimentary
|Illustrations||location maps; seismic reflection profiles; schematic diagrams; cross-sections, stratigraphic; tables|
|Program||Exploration Science and Technology (EXTECH IV) Initiative, 2000-2003, Athabasca Uranium Multi-disciplinary Study|
|Abstract||Interim results from the EXTECH IV 2000 high-resolution seismic reflection program at the McArthur River mine site are presented and assessed in light of the original objectives that were set for this
program. General observations from 2D high-resolution profile 12 include: |
1) A prominent reflector of unknown origin at ~120 m depth within the sedimentary column with <50 m of relief over its ~1.5 km lateral extent.
2) A prominent reflector
at ~400 to 600 m depth with relief of up to 120 m (both paleotopography and/or syn-post sedimentation faulting) which is tentatively interpreted as a well-developed regolith at the basement unconformity.
3) Laterally limited subhorizontal
reflections between these prominent reflections that may represent lateral variations in the physical properties of the sediments.
4) Angular disconformities within the sedimentary column.
5) Reverse faults along the interpreted unconformity
including the P2 fault.
6) A reflection response from the location of the orebody.
7) Basement reflections with estimated true dips of ~40º to 45ºSE.
Simulated seismic responses for a model of the orebody indicate that: 1) diffractions
are produced by both the orebody and the hosting (or bounding) fault zone; 2) the orebody diffraction has higher amplitudes down-dip; 3) horizontal component geophones may provided enhanced detection of the steeply dipping ore zones; and 4) the
characteristic diffraction response is observed on the unmigrated section. Preliminary results from the pseudo-3D survey show reflections at the depth corresponding to the unconformity as interpreted on the 2D profiles.