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Trapping of aeolian sediments and build-up of the ice cover of a dry-based Antarctic lake Earth Surface Processes and Landforms

par Sleewaegen, Suzanne ;Lorrain, Reginald ;Offer, Zvi Yehoshua ;Azmon, E;Fitzsimons, Sean ;Souchez, Roland
Référence Earth surface processes and landforms, 27, 3, page (307-315)
Publication Publié, 2002

Article révisé par les pairs

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Résumé :

Among the perennially frozen lakes of the Dry Valleys of South Victoria Land (Antarctica), some are dry-based, i.e. frozen to the bottom. One of these is studied here by a multiparametric investigation (isotopic composition in δD and δ18O, ions, gas and ice texture analyses). A sediment layer about 10 cm thick appearing at a depth of 3.5 m is also studied by grain size, X-ray diffraction and scanning electron microscope analyses. The information retrieved indicates that this ice-block lake results from a build-up in two steps and explains how acolian sediments were included as a layer into the ice. Copyright © 2002 John Wiley and Sons, Ltd.