NDLI: Characterisation of marine and lacustrine sediments in a drowned thermokarst embayment, Richards Island, Beaufort Sea, Canada

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International Journal of Earth Sciences : Volume 89, Issue 2, September 2000

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International Journal of Earth Sciences : Volume 86

Characterisation of marine and lacustrine sediments in a drowned thermokarst embayment, Richards Island, Beaufort Sea, Canada

Content Provider	Springer Nature Link
Author	Solomon, S. Mudie, P. J. Cranston, R. Hamilton, T. Thibaudeau, S. A. Collins, E. S.
Copyright Year	2000
Abstract	A multidisciplinary study was made of lakes and lagoons in a thermokarst embayment on Richards Island, Canadian Beaufort Sea, in order to investigate the response of the Mackenzie Delta shoreline to changing hydrological influences. Seismo-acoustic profiles made from an amphibious vehicle, combined with sediment core data, show that the deepest lakes contain up to 10 m of transparent or stratified silty mud overlying the Kittigazuit sand basement. Palynological and microfossil data from 21 surface samples allow delineation of freshwater, saltmarsh, tidal flat and subtidal assemblages. These modern reference data allow distinction of freshwater and marine facies in the cores and subsequent interpretation of geochemical content (carbon, ammonia, sulphate). Radiocarbon dates and 137 Cs show that sedimentation rates have increased by an order of magnitude since drowning of the embayment during the past millennium, and that most of this sediment is from the Mackenzie River plume.
Starting Page	503
Ending Page	521
Page Count	19
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	89
Issue Number	3
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-11-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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