Cyclones and tides as feeders of a submarine canyon off Bangladesh

Abstract

Research Article| August 01, 1998 Cyclones and tides as feeders of a submarine canyon off Bangladesh H. R. Kudrass; H. R. Kudrass 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany Search for other works by this author on: GSW Google Scholar K. H. Michels; K. H. Michels 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany Search for other works by this author on: GSW Google Scholar M. Wiedicke; M. Wiedicke 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany Search for other works by this author on: GSW Google Scholar A. Suckow A. Suckow 2Geowissenschaftliche Gemeinschaftsaufgaben, Stilleweg 2, D-30655 Hannover, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information H. R. Kudrass 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany K. H. Michels 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany M. Wiedicke 1Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany A. Suckow 2Geowissenschaftliche Gemeinschaftsaufgaben, Stilleweg 2, D-30655 Hannover, Germany Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (8): 715–718. https://doi.org/10.1130/0091-7613(1998)026<0715:CATAFO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation H. R. Kudrass, K. H. Michels, M. Wiedicke, A. Suckow; Cyclones and tides as feeders of a submarine canyon off Bangladesh. Geology 1998;; 26 (8): 715–718. doi: https://doi.org/10.1130/0091-7613(1998)026<0715:CATAFO>2.3.CO;2 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 Extremely high annual sedimentation rates of about 50 cm/yr at the head of the submarine canyon "Swatch of No Ground," which connects the submarine delta of the Ganges-Brahmaputra to the Bengal deep-sea fan were estimated by 210Pb and 137Cs gamma spectrometry. The sediment in the canyon at 228 m water depth consists of graded sand and silt layers and laminated mud. The sand and silt layers are assumed to have been deposited by tropical cyclones, whereas the intercalated laminated mud is thought to have been deposited by daily variations of tidal currents. The graded layers correlate well with the historical record of cyclones and allow an annual fine tuning. The rapid infill of the canyon head is caused by trapping of suspended sediment that has been mobilized by storms and tides on the delta topset. The sediment is stored only temporarily in the canyon head: slides, slumps, and earthquakes occasionally remove and transfer it by turbidity currents to the deep-sea fan. The focusing effect of the canyon and the subsequent stepwise export of sediment, probably combined with erosion of the canyon floor, explain the long-term regional stability of this canyon and probably other shelf canyons. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.