Baltrūnas, V., Waller, R. I., Kazakauskas, V., Paškauskas, S., Katinas, V.
A comparative case study of subglacial bedforms in northern
Lithuania and south-eastern Iceland
This paper aims to compare the dynamics of the subglacial
environment as determined by an analysis of the structure and sedimentology of
both Pleistocene and modern glacial deposits. Investigations focused on
subglacial sediments in areas of streamlined relief in northern Lithuania
(Ruopiškiai megascale subglacial lineations - MSGL) and south-eastern Iceland
(drumlinised terrain exposed by the recent retreat of Skeiðarárjökull glacier).
Sedimentological analyses involved granulometry, till macrofabrics, and the
anisotropy of magnetic susceptibility (AMS) of micro-clasts. Comparative
investigations of subglacial bedforms exposed at Ruopiškiai and Skeiðarárjökull
highlighted differences in their formation and post-genetic transformation. In
both cases, their initiation was associated with ice advance and subglacial
sediment deformation. However, subsequent dynamics were different.