On the δO 18, δD and D-excess relations in meteoric precipitation and during equilibrium freezing: theoretical approach and field examples

Special Issue : Stable isotopes and geochemistry of ground ice

Auteur(s) et Affiliation(s)

LACELLE, D.

Dep. of Earth Sciences, Univ., Ottawa, Canada

MEYER, H.

Alfred Wegener Inst. for Polar and Marine Research, Research Unit, Potsdam, Allemagne

SLETTEN, R.S.

Univ. of Washington, Seattle, Etats-Unis

Description :
This study reviews the principles of fractionations affecting δD, δO 18 and deuterium excess (d) in meteoric precipitation and during equilibrium freezing of water under changing freezing rates. Many studies are starting to use the calculation of d to infer the origin of subsurface ice. However, d values do not provide much information on the origin of subsurface ice, as d is dependent on freezing conditions. To make proper use of d, its relation with D needs to be investigated, with no relation reflecting meteoric precipitation and a negative relation indicative of freezing. In all cases, it is recommended that stable O-H isotope measurements be supported by additional distinguishing tools (i.e. entrapped gases) when attempting to infer subsurface ice types.

Type de document :
Article de monographie

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2011, vol. 22, n°. 1, p. 13-25, nombre de pages : 13, Références bibliographiques : 37 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais