Rates of sediment delivery from the Fennoscandian Ice Sheet through an ice age

Research Article| January 01, 2010 Rates of sediment delivery from the Fennoscandian Ice Sheet through an ice age Julian A. Dowdeswell; Julian A. Dowdeswell 1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK Search for other works by this author on: GSW Google Scholar Dag Ottesen; Dag Ottesen 2Geological Survey of Norway, Trondheim N-7491, Norway Search for other works by this author on: GSW Google Scholar Leif Rise Leif Rise 2Geological Survey of Norway, Trondheim N-7491, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Julian A. Dowdeswell 1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK Dag Ottesen 2Geological Survey of Norway, Trondheim N-7491, Norway Leif Rise 2Geological Survey of Norway, Trondheim N-7491, Norway Publisher: Geological Society of America Revision Received: 02 Jul 2009 Accepted: 15 Jul 2009 Received: 16 Sep 2009 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (1): 3–6. https://doi.org/10.1130/G25523.1 Article history Revision Received: 02 Jul 2009 Accepted: 15 Jul 2009 Received: 16 Sep 2009 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Julian A. Dowdeswell, Dag Ottesen, Leif Rise; Rates of sediment delivery from the Fennoscandian Ice Sheet through an ice age. Geology 2010;; 38 (1): 3–6. doi: https://doi.org/10.1130/G25523.1 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 Sediment delivery rates through an entire ice age are investigated using seismic records of glacial erosion products from the Fennoscandian Ice Sheet deposited offshore of mid-Norway in the 2.7 m.y. old Naust Formation (volume 100,000 km3). The mean sedimentation rate over the ice age is ∼0.24 m k.y.−1, with bedrock lowering of ∼520 m in the ice-sheet catchment. The mean sediment delivery is 2–3 times higher for the most recent 600 k.y. than for earlier Naust sequences. The hypothesis that glacial erosion is most rapid early in an ice age, when there was presumably much weathered bedrock and preglacial sediment available, is not accepted for our study area. More important are changing ice-sheet dimensions and dynamics, varying intensity of individual glacial cycles, and complex ice-sheet dynamics in single deglaciations. The mean rate of sediment delivery from ice sheets is an order of magnitude higher than from fluvial activity in the huge Amazon and Mississippi systems, implying that ice is a very effective agent of long-term denudation during cold periods of Earth history. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.