Glaciotectonic deformation indicating a Late Weichselian readvance in the vicinity of Berghem, southwestern Sweden

Abstract

Investigations of the deglaciation in the Berghem area, southwestern Sweden, have revealed deformation of two mainly glaciofluvial deposits. The deposits were investigated by stratigraphical and structural methods. The deformations are interpreted to be the result of glacier readvance in the fjord-like valleys during the Late Weichselian. However, indications of readvance have not been found above the marine limit. Since the readvance is reflected in similar stratigraphical positions, the readvances in the valleys are interpreted to belong to one and the same glacial event. The conditions which triggered the readvance are uncertain. The glacial readvance caused various kinds of deformation at the investigated sites. The differences are interpreted to be due both to differences in local stratigraphy and to the grain-size distribution of the sediments across which the glacier readvanced, and they are described in connection with proposed glaciotectonic models.

Key Words:

• Berghem
• southwestern Sweden
• Late Weichselian
• glaciotectonics