Permafrost development in the intertidal zone at Churchill, Manitoba. A possible mechanism for accelerated beach uplift

ABSTRACT. Boreholes drilled in the &ech Bay area during July to Novembcr 1929 indicated that a sill of permafrost had extended below the high-water line, tapering in depth towards low water. The boreholes revealed thick layers of fine sediments on top of deep underlain bedrock. Recent bor-ings d...

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Bibliographic Details
Main Authors: Roger I. C. Hansell, Peter A. Scott, Richard Staniforthz, Josef Svoboda
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 1983
Subjects:
Key words
permafrost
active zone
isostatic uplift
Beech Bay
Churchill
Hudson Bay
Bor
Hudson
Arctic
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.3669
http://pubs.aina.ucalgary.ca/arctic/Arctic36-2-198.pdf
Description
Summary:ABSTRACT. Boreholes drilled in the &ech Bay area during July to Novembcr 1929 indicated that a sill of permafrost had extended below the high-water line, tapering in depth towards low water. The boreholes revealed thick layers of fine sediments on top of deep underlain bedrock. Recent bor-ings determined the upper limits of permafrost in 1981, Examination of the data shows that here has been a permafrost expansion into the emerging tidal tone. TheSc observations suggest an additional mwhanism for accelerated uplift of coastal exposed “soft ” sediments: the vertical expansion of refrozen. water-saturated silts and clays as new permafrost forms. The existing rates of isostatic uplift are enhanced by the process.

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