Sediment texture in contemporary glacial environment - examples from Hansbreen, southern Spitsbergen
Tekstury osadów współczesnych środowisk glacjalnych
na przykładzie lodowca Hansa, południowy Spitsbergen
1Institute of Quaternary Research and Geoecology, Adam Mickiewicz University, Poznań
2Institute of Geology, Adam Mickiewicz University, Poznań
Abstract: The sediment texture data (grain size, quartz grain abrasion, and roundness) from different glacial environments at Hansbreen in southern Spitsbergen are presented. The six main sediment groups were distinguished: subglacial till, supraglacial debris cover, debris flow deposits, supra- and englacial meltwater stream deposits, dirt cone and proglacial glaciofluvial deposits. The division is supported by grain size statistics (presented in form of 3D diagrams), and is also legible in quartz grain abrasion differences. The latter one reveals strong changeability depending on the grain size class. No correlation between clay ratio and standard deviation vs. quartz grain abrasion was found. Lithology has limited impact on clast roundness (analysed for > 2.8 mm fraction), although restricted by short distance and time of transportation. A comparison with similar data set from Werenskioldbreen shows the deposits of Hansbreen as more mature, which is probably caused by reworking of older deposits and longer transport.
Key words: glacial deposits, texture, Spitsbergen.
Pełny tekst artykułu 
