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TitleObservations of Postglacial Uplift At Churchill, Manitoba
AuthorTushingham, A M
SourceCanadian Journal of Earth Sciences vol. 29, no. 11, 1992 p. 2418-2425, (Open Access)
Alt SeriesGeological Survey of Canada, Contribution Series 40091
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
NTS54L; 54E; 64A; 64B; 64G; 64H
AreaChurchill; Missi Falls; Southern Indian Lake; Northern Indian Lake
Lat/Long WENS-100.0000 -94.0000 59.0000 56.0000
Subjectsgeophysics; surficial geology/geomorphology; isostasy; ice sheets; isostatic rebound; tides; gravimetric analyses; sea level changes; discharge rates; Laurentide Ice-sheet; Quaternary
Illustrationssketch maps; analyses
AbstractChurchill, Manitoba, is located near the centre of postglacial uplift caused by the Earth's recovery from the melting of the Laurentide Ice Sheet. The value of present-day uplift at Churchill has important implications in the study of postglacial uplift in that it can aid in constraining the thickness of the ice sheet and the rheology of the Earth. The tide-gauge record at Churchill since 1940 is examined, along with nearby Holocene relative sea-level data, geodetic measurements, and recent absolute gravimetry measurements, and a present-day rate of uplift of 8 9 mm/a is estimated. Glacial isostatic adjustment models yield similar estimates for the rate of uplift at Churchill. The effects of the tide-gauge record of the diversion of the Churchill River during the mid-1970's are discussed.