Depositional processes within the frontal icecored moraine system, Ragnar glacier, Svalbard.
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Date
2010
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Publisher
WydziaĆ Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza
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Abstract
The marginal zone of the Ragnar glacier has been divided into four zones: ice surface, proglacial
lake, lateral moraine and frontal moraine complex. Detailed researches were carried out in the last one - frontal
moraine complex consisting of three subzones: (1) outer moraine ridge, (2) culmination moraine ridge and (3)
inner moraine plateau. The frontal moraine complex of the Ragnar glacier shows large variability of lithofacies
and depositional processes. The aim of this study was to reconstruct the intensity and variability of depositional
processes from early stage of the frontal ice-cored moraines creation till present situation. Debris fl ow processes,
glaciofl uvial and glaciolacustrine sedimentation as well as aeolian activity and down- and backwasting
are identifi ed as most important processes. Intensity of these processes has varied through the time. Presently
the frontal ice-cored moraine complex of the Ragnar glacier is relatively stable, except few areas affected by the
river or streams.
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Keywords
ice-cored moraines, depositional processes, sedimentology, Spitsbergen, Arctic
Citation
Quaestiones Geographicae vol. 29 (1), 2010, pp.27-36
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ISBN
978-83-62662-62-3
ISSN
0137-477X