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Systématique du Remplissage en Eau des Fentes de Gel: Les Résultats d'une Étude Oxygène‐18 et Deutérium

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  • B. Lauriol
  • C. Duchesne
  • I. D. Clark

Abstract

Une douzaine de coins de glace le long de la rivière Porcupine (Yukon) ont été échantillonnés pour identifier leur période de croissance et pour déterminer l'origine de l'eau qui les a formés. Les datations au radiocarbone des sédiments qui les contiennent limitent leur période de croissance aux 4 derniers millénaires. Les isotopes stables montrent une homogénéité entre les centres et les bordures des coins, indiquant une stabilité climatique durant cette période. Le δ18O/δ2H est enrichi par rapport aux précipitations hivernales et se situe au‐dessous de la ligne des eaux météoriques ce qui laisse penser que les fentes de gel sont remplies durant les derniers moments de la fonte. A series of ice wedges along the Porcupine River (Yukon) has been sampled to identify their periods of growth and the source of infiltrating water. Radiocarbon dates of enclosing sediments constrain the periods of growth to younger than 4000 BP. Stable isotopes show a homogeneity between ice wedge centres and exteriors, indicating climatic stability over this time. The δ18O/δ2H signatures are enriched above winter precipitation and plot below the meteoric water line, indicating that ice wedges are filled during the later stages of snow melt.

Suggested Citation

  • B. Lauriol & C. Duchesne & I. D. Clark, 1995. "Systématique du Remplissage en Eau des Fentes de Gel: Les Résultats d'une Étude Oxygène‐18 et Deutérium," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 6(1), pages 47-55, January.
    • Handle: RePEc:wly:perpro:v:6:y:1995:i:1:p:47-55
    DOI: 10.1002/ppp.3430060106
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