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TitleInvestigations of gravity and isostacy in the southern Canadian Cordillera
AuthorGarland, G D; Tanner, J G
SourcePublications of the Dominion Observatory vol. 19, no. 5, 1957, 56 pages (2 sheets),
PublisherCanada Department of Mines and Technical Surveys (Ottawa, Canada)
MapsPublication contains 2 maps
Map Info.geophysical, Bouguer gravity, 1:2,534,400
Map Info.geophysical, isostatic anomalies, 1:2,534,400
Mediapaper; on-line; digital
File formatpdf
ProvinceAlberta; British Columbia
NTS82; 83A; 83B; 83C; 83D; 83E; 83F; 83G; 83H; 92G; 92H; 92I; 92J; 92O; 92P; 93A; 93B
AreaRocky Mountain
Lat/Long WENS-124.0000 -113.0000 54.0000 49.0000
Subjectsgeophysics; structural geology; agglomerates; andesites; chlorite; conglomerates; densities; gneisses; granites; gravity interpretations; gypsum; lavas; magnetic field; magnetic interpretations; mohorovicic discontinuity; quartzites; radium; sandstones; schists; shales; slates; gravity surveys, ground; intrusive rocks; Banff Formation; Cathedral Limestone; Coast Range Intrusives; Cordillera; Eldor Limestone; Elko Formation; Hector Formation; Nelson Granites; Purcell Formation; Rocky Mountain Trench; Shuswap Complex; Upper Purcell Formation; Windermere Formation; Precambrian; Paleozoic; Mesozoic; Cambrian; Cretaceous
Illustrationsgeoscientific sketch maps; tables; location maps; geophysical profiles; cross-sections
Released1957 01 01; 2018 10 09
AbstractA regional gravity investigation of southern British Columbia and southwestern Alberta is described. The values of gravity are obtained from a network of closed circuits, subjected to a least squares solution, while the instrumental calibration is made with reference to stations established with the Cambridge pendulums. Maps of Bouguer and isostatic anomalies for the region are presented, and the compensation of the mountain systems is discussed. An Airy form of compensation appears reasonable, although certain features such as granitic batholiths show considerable isostatic anomalies. Detailed measurements over the Rocky Mountain Trench indicate a considerable thickness of lighter fill in some sections, but do not strongly suggest a major crustal dislocation beneath it.