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(Article of periodic en Anglais - 2011)

Document title

Investigation of ice-wedge infilling processes using stable oxygen and hydrogen isotopes, crystallography and occluded gases (O2, N2, Ar)

published at : Special Issue : Stable isotopes and geochemistry of ground ice

Authors(s) and Affiliation(s)

SAINT-JEAN M. (1) ; LAURIOL B. (1) ; CLARK I.D. (2) ; LACELLE D. (3) ; ZDANOWICZ C. (1) ;
(1) Dep. of Geography, Univ., Ottawa, CANADA
(2) Dep. of Earth Sciences, Univ., Ottawa, CANADA
(3) Planetary Exploration and Space Astronomy, Canadian Space Agency, St-Hubert, CANADA

Abstract

The AA. investigated the infilling process in ice wedges of various ages (modern to Pleistocene) preserved in the Old Crow region (Yukon), dating from the Late Holocene, and Vault Creek tunnel (Alaska), dating from the Late Pleistocene. A variety of techniques are used, including ice crystallography, the determination of &O 18 (ice) and &D (ice), the molar ratios of occluded gases (&(O2/Ar) and &(N2/Ar)), and the stable isotope composition of O2 (&O 18) and N2 (&N 15) gases. The results indicate that climatic and site-specific conditions may influence the source of infilling during ice-wedge growth, so that wedge ice in wet and dry environments exhibits different characteristics. In both ice-wedge types, the δ(O2/Ar) values are much lower than both dissolved and atmospheric values, which may be due to the respiration of microorganisms living within ice bubbles or interstitial water at the grain boundaries

Source

Thematical fascicle

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2011, vol. 22, no 1 [pp. 49-64]

Bibliographic references : 56 ref.

Collation : fig., tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.680

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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