Three-dimensional seismic data from the Barents Sea margin reveal evidence of past ice streams and their dynamics

Research Article| August 01, 2004 Three-dimensional seismic data from the Barents Sea margin reveal evidence of past ice streams and their dynamics Karin Andreassen; Karin Andreassen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Search for other works by this author on: GSW Google Scholar Lena Charlotte Nilssen; Lena Charlotte Nilssen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Search for other works by this author on: GSW Google Scholar Bjarne Rafaelsen; Bjarne Rafaelsen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Search for other works by this author on: GSW Google Scholar Luppo Kuilman Luppo Kuilman 2Norsk Hydro ASA, 0246 Oslo, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Karin Andreassen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Lena Charlotte Nilssen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Bjarne Rafaelsen 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway Luppo Kuilman 2Norsk Hydro ASA, 0246 Oslo, Norway Publisher: Geological Society of America Received: 28 Jan 2004 Revision Received: 02 Apr 2004 Accepted: 05 Apr 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (8): 729–732. https://doi.org/10.1130/G20497.1 Article history Received: 28 Jan 2004 Revision Received: 02 Apr 2004 Accepted: 05 Apr 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Karin Andreassen, Lena Charlotte Nilssen, Bjarne Rafaelsen, Luppo Kuilman; Three-dimensional seismic data from the Barents Sea margin reveal evidence of past ice streams and their dynamics. Geology 2004;; 32 (8): 729–732. doi: https://doi.org/10.1130/G20497.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Three-dimensional seismic data from the southern flank of the outer Bear Island Trough at the western Barents Sea margin show former ice-stream activity; the interpretation of such activity is based on megascale lineations and long chains of megablocks and rafts buried in thick till units between glacially eroded horizons. In several units the sediment blocks and rafts are aligned in chains up to 2 km wide and 50 km long. Individual megablocks have an areal extent of up to 2.2 km2, and their internal structure is well preserved, providing information about the processes involved in their incorporation into the ice, subsequent detachment, and partial disintegration. Previous discussions of sub–ice-stream processes have focused on ductile deformation of weak sediments and molding of subglacial landforms. This work also demonstrates the importance of brittle sediment deformation in these settings, adding to the understanding of ice streams as agents of glacial erosion, transport, and sedimentation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.