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TitleCharacterization and mapping of the permafrost zone on land based seismic reflection data, Canadian Arctic Islands
AuthorBrent, T A; Harrison, J C
SourcePermafrost: Seventh International Conference, Yellowknife, Canada, proceedings and abstracts; by Lewkowicz, A G (ed.); Allard, M (ed.); Collection Nordicana no. 57, 2000 p. 83-88; 1 CD-ROM
Alt SeriesGeological Survey of Canada, Contribution Series 1997171
PublisherUniversité Laval, Centre d'études nordiques (Laval, Québec, Canada)
MeetingSeventh International Conference on Permafrost; Yellowknife, NWT; CA; June 23-27, 1998
File formatpdf (Adobe Acrobat)
ProvinceNorthern offshore region; Nunavut
NTS58C; 58D; 58E; 58F; 58G; 58H; 59A; 59B; 59C; 59D; 59E; 59F; 59G; 59H; 68C; 68D; 68E; 68F; 68G; 68H; 69A; 69B; 69C; 69D; 69E; 69F; 69G; 69H; 78C; 78D; 78E; 78F; 78G; 78H; 79A; 79B; 79C; 79D; 79E; 79F; 79G; 79H; 88C; 88D; 88E; 88F; 88G; 88H; 89A; 89B; 89C; 89D; 89E; 89F; 89G; 89H; 560A; 560B
AreaSabine Peninsula
Lat/Long WENS-118.0000 -90.0000 80.0000 73.0000
Subjectshydrogeology; sedimentology; permafrost; arctic geology; climate, arctic; seismic reflection surveys; seismic data; bedrock geology; heat flow; freezing ground
Illustrationslocation maps; graphs; seismic reflection profiles
AbstractIndustry seismic profiles have been utilized to locate the base of ice-bonded permafrost (BIBP) throughout the Canadian Arctic Islands in porous Devonian through Tertiary bedrock to 1008 m below surface. Seismically-defined BIBP features, located at 160 to 480 milliseconds (ms), have been correlated with conventional BIBP as picked on petrophysical logs, and thermal profiles of studied exploration wells. Identifying seismic features include: 1) a continuous reflector from the base of permafrost ice that transects inclined stratal reflections; 2) amplitude decay of stratal reflectors at the BIBP; 3) bending of stratal reflectors that pass through the BIBP; 4) amplitude anomalies associated with a lithology and porosity dependent transitional BIBP and; 5) step-down of sub-permafrost reflectors that extend beyond the shoreline limit of permafrost. These data can provide an improved understanding of regional heat flow and porosity variation in bedrock, and insight into the growth and decay of the permafrost layer.