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Late Quaternary slumps and debris flows on the Scotian Slope

1985; Geological Society of America; Volume: 96; Issue: 12 Linguagem: Inglês

10.1130/0016-7606(1985)96 2.0.co;2

1943-2674

David J. W. Piper, John A. Farre, Alexander Shor,

Geological formations and processes

Research Article| December 01, 1985 Late Quaternary slumps and debris flows on the Scotian Slope DAVID J. W. PIPER; DAVID J. W. PIPER 1Atlantic Geoscience Centre, Geological Survey of Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2 Canada Search for other works by this author on: GSW Google Scholar J. A. FARRE; J. A. FARRE 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar A. SHOR A. SHOR 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar Author and Article Information DAVID J. W. PIPER 1Atlantic Geoscience Centre, Geological Survey of Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2 Canada J. A. FARRE 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 A. SHOR 2Lamont-Doherty Geological Observatory, Palisades, New York 10964 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1985) 96 (12): 1508–1517. https://doi.org/10.1130/0016-7606(1985)96 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation DAVID J. W. PIPER, J. A. FARRE, A. SHOR; Late Quaternary slumps and debris flows on the Scotian Slope. GSA Bulletin 1985;; 96 (12): 1508–1517. doi: https://doi.org/10.1130/0016-7606(1985)96 2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract The Scotian Slope just west of Verrill Canyon was surveyed using the Sea MARC I deep-towed sidescan-sonar system, high-resolution seismic-reflection profiles, and 25 piston cores.The generally smooth continental slope has a gradient of ∼2.5°. It is crossed by 2 small valleys that are 1 km wide and 100 m deep. Much of the sea bed shows evidence of surficial sliding that removed 10–20 m of sediment, and the slide scars give the sea bed a steplike morphology. From the 600-m isobath to ∼1,800 m, there extend 2 zones of disturbed sediment. These disturbed zones have the rough surface and transparent acoustic character previously regarded as characteristic of debris flows, but sidescan-sonar images and cores suggest that they are principally rotational slide deposits, with true debris flows at their distal limits. Streamlined erosional depressions near the downslope edge of the debris flows cut both the flow and sediment farther down-slope. These may have been produced by a turbidity current associated with the debris flows. Sorted coarse sand in piston cores provides further evidence of current activity. This widespread sediment failure on relatively low slopes was probably the result of a large earthquake that can be dated from cores as occurring between 5000 and 12000 yr B.P. This content is PDF only. Please click on the PDF icon to access. 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.