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TitleSeismic reflection profiling: an effective exploration tool in the Athabasca Basin? An interim assessment
AuthorWhite, D J; Roberts, B; Mueller, C; Hajnal, Z; Gyorfi, I; Reilkoff, B; Koch, R; Powell, B
SourceSummary of investigations 2002, volume 2, Saskatchewan Geological Survey; 2002, 7 pages
LinksOnline - En ligne
Alt SeriesGeological Survey of Canada, Contribution Series 2002147
Mediapaper; on-line; digital
File formatpdf
NTS64E; 64L; 64M; 74E; 74F; 74G; 74H; 74I; 74J; 74K; 74L; 74M; 74N; 74O; 74P
Areanorthern Saskatchewan
Lat/Long WENS-111.3333 -103.2000 59.4167 57.0667
Subjectsgeophysics; economic geology; sedimentology; metallic minerals; paleotopography; seismic reflection surveys; basins; sedimentary basins; mineral deposits; uranium; mineral exploration; sedimentary rocks
Illustrationslocation maps; seismic reflection profiles; schematic diagrams; cross-sections, stratigraphic; tables
ProgramExploration Science and Technology (EXTECH IV) Initiative, 2000-2003, Athabasca Uranium Multi-disciplinary Study
AbstractInterim 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.