Glacier ice structures infl uence on moraines developement (Hørbye glacier, Central Spitsbergen).
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Date
2010
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Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza
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Abstract
Geomorphological and basic sedimentological investigation of controlled moraine system was carried
out at the ice surface and within the moraine complex zone of the Hørbye glacier (Central Spitsbergen). The
Hørbye glacier creates controlled moraine chains regarding transversal fractures and longitudinal foliation. The
forms parallel to the ice fl ow direction are represented by medial moraines, whereas transversal ones by thrustmoraines.
Both arrangements are clearly visible. However, thrust and shear planes are more effective in creating
forms, both on the ice surface and in the moraine complex. The longitudinal landforms are less distinct, moreover
they are coarser-grained and worse rounded, in contrast to the material from shear and thrust plains which
is fi ner and better rounded. The study area can be divided into three subzones: clean ice surface, debris covered
ice fractures and moraine complex. The outer and inner sandur plain were not taken under consideration. It is
suggested that present arrangement of both thrust or shear plains and longitudinal foliation controls formation
of foreland relief. This hypothesis has a particular sense in understanding construction of modern sedimentary
basins as well as the mechanism of terminoglacial relief formation with regend to ice structure.
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Keywords
Arctic, Spitsbergen, ice structure, controlled moraines, sedimentary basins
Citation
Quaestiones Geographicae vol. 29 (1), 2010, pp.65-73
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ISBN
978-83-62662-62-3
ISSN
0137-477X