GEOCHEMISTRY OF THE ACTIVE LAYER AND PERMAFROST IN NORTHWESTERN CANADA: FROM MEASUREMENTS TO QUATERNARY STRATIGRAPHY
Denis Lacelle, Marielle Fontaine, Steve Kokelj
In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost ConferenceSession: John Ross MacKay Symposium - Permafrost III / Symposium John Ross MacKay - Pergélisol III
ABSTRACT: The amount and distribution of soluble ions and salts in active layer and permafrost provide a tool to assess present and past changes in active layer thickness, and chemical weathering regimes in a given landscape. This short paper summarizes various methodologies used for the extraction of soluble salts and ions in the active layer and permafrost, and then tests two methods from two sites in northwestern Canada. The results are discussed with respect to the extraction techniques, the timing of permafrost aggradation following sediment deposition (i.e., syngenetic vs epigenetic permafrost) and the history of permafrost (i.e., relict active layer vs residual thaw layer).
RÉSUMÉ: La quantité et la distribution des ions et des sels solubles dans la couche active et le pergélisol constituent un outil pour évaluer les changements passés et présents de l'épaisseur de la couche active et des régimes d'altération chimique d™un paysage. Cet article résume différentes méthodes utilisées pour l'extraction des ions et des sels solubles dans la couche active et le pergélisol, puis teste deux méthodes sur deux sites dans le nord-ouest du Canada. Les résultats sont discutés par rapport aux techniques d'extraction, à l™expansion du pergélisol suivant le dépôt des sédiments (pergélisol syngénétique vs épigénétique) et à l'histoire du pergélisol (couche active relique vs couche de dégel résiduelle).
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Denis Lacelle; Marielle Fontaine; Steve Kokelj (2015) GEOCHEMISTRY OF THE ACTIVE LAYER AND PERMAFROST IN NORTHWESTERN CANADA: FROM MEASUREMENTS TO QUATERNARY STRATIGRAPHY in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.
@article{422,
author = Denis Lacelle; Marielle Fontaine; Steve Kokelj,
title = GEOCHEMISTRY OF THE ACTIVE LAYER AND PERMAFROST IN NORTHWESTERN CANADA: FROM MEASUREMENTS TO QUATERNARY STRATIGRAPHY ,
year = 2015
}
title = GEOCHEMISTRY OF THE ACTIVE LAYER AND PERMAFROST IN NORTHWESTERN CANADA: FROM MEASUREMENTS TO QUATERNARY STRATIGRAPHY ,
year = 2015
}