Skip to main content
Fig. 6 | Swiss Journal of Geosciences

Fig. 6

From: Multiple Quaternary erosion and infill cycles in overdeepened basins of the northern Alpine foreland

Fig. 6

Thin-section of the LFA5 diamicton in core B5/12. a At 89 m depth, a relative sandy interval reveals a densely-packed diamicton supported by sand-sized grains up to ~ 10 mm in diameter. A wide-spectrum of grain shapes from well-rounded to angular can be observed. Grains with mixed, rounded and angular, outline parts are common. b In close-up view many grains are crushed and appear as separated pieces and flakes close to the main grain. These in situ crushed grains are typical for high stress concentrations attained at grain contacts during subglacial deformation. Microstructural mapping further reveals the common occurrence of mm-long lineations throughout the sediment. c Thin-section taken from the transition between LFA5 till and glacio-lacustrine sediments (LFA3) at 91 m in B5/12. Texturally similar regions (domains D1–D4), probably reflecting initial sedimentary structures, and accessory turbate features, with tangentially aligned clast long-axis, appear to be contorted around the larger grain at the centre of the thin-section potentially in response to subglacial deformation

Back to article page