Dumpstones as records of overturning ice rafts in a Weichselian proglacial lake (Rügen Island, NE Germany)

Authors

  • Malgorzata Pisarska-Jamrozy Instytut Geologii, Adam Mickiewicz University http://orcid.org/0000-0001-5878-5662
  • Antonius Johannes (Tom) Van Loon Geocom Consulting, Valle del Portet 17, 03726 Benitachell, Spain College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
  • Małgorzata Bronikowska Geological Institute, Adam Mickiewicz University, B. Krygowskiego 12, 61-680 Poznań, Poland

DOI:

https://doi.org/10.7306/gq.1448

Keywords:

dumpstones, dropstones, ice-rafted debris, Weichselian, glaciolacustrine sediments

Abstract

Dumpstones and dropstones up to 0.8 m in size occur in a silty/sandy Weichselian glaciolacustrine succession near Dwasieden on Rügen Island in the SW Baltic Sea (NE Germany). The deposits are exceptional because two levels of dumpstones and dropstones are present, suggesting two dumping phases interrupting characteristic fine-grained glaciolacustrine sedimentation. Plastic downwarping of sediments below the dumpstones and dropstones result in soft-sediment deformation structures. The distribution and orientation of the long axes of the clasts are useful tools for the reconstruction of the state of the lake bottom, as well as for the water depth. The horizontal position of the gravels and boulders (parallel to the bedding) suggests deposition in relatively shallow-water. The dumping events are linked to iceberg rafting in a glacial lake during the Weichselian Glaciation (MIS 2).

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Published

2018-12-21

Issue

Vol. 62 No. 4 (2018)

Section

Articles

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