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Reconnaissance in DSRV Alvin of a “fluvial-like” meander system in Wilmington Canyon and slump features in South Wilmington Canyon

1982; Geological Society of America; Volume: 10; Issue: 1 Linguagem: Inglês

10.1130/0091-7613(1982)10 2.0.co;2

1943-2682

William L. Stubblefield, Bonnie A. McGregor, Evan B. Forde, Douglas N. Lambert, G. F. Merrill,

Geology and Paleoclimatology Research

Research Article| January 01, 1982 Reconnaissance in DSRV Alvin of a "fluvial-like" meander system in Wilmington Canyon and slump features in South Wilmington Canyon W. L. Stubblefield; W. L. Stubblefield 1National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar B. A. McGregor; B. A. McGregor 2U.S. Geological Survey, Fisher Island Station, Miami, Florida 33139 Search for other works by this author on: GSW Google Scholar E. B. Forde; E. B. Forde 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar D. N. Lambert; D. N. Lambert 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar G. F. Merrill G. F. Merrill 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar Author and Article Information W. L. Stubblefield 1National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 B. A. McGregor 2U.S. Geological Survey, Fisher Island Station, Miami, Florida 33139 E. B. Forde 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 D. N. Lambert 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 G. F. Merrill 3National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, 4301 Rickenbacker Causeway, Miami, Florida 33149 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1982) 10 (1): 31–36. https://doi.org/10.1130/0091-7613(1982)10 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 Email Permissions Search Site Citation W. L. Stubblefield, B. A. McGregor, E. B. Forde, D. N. Lambert, G. F. Merrill; Reconnaissance in DSRV Alvin of a "fluvial-like" meander system in Wilmington Canyon and slump features in South Wilmington Canyon. Geology 1982;; 10 (1): 31–36. doi: https://doi.org/10.1130/0091-7613(1982)10 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 SocietyGeology Search Advanced Search Abstract Three dives in DSRV Alvin on the Atlantic Continental Rise in Wilmington and South Wilmington Canyons, off the east coast of the United States, allowed examination and sampling of morphological features, in water depths of 2,300 to 2,400 m, that were observed in midrange sidescan sonar data. In Wilmington Canyon, a "fluvial-like" meandering system was confirmed. The meandering channel had steep undercut outer banks and gently sloping inner banks. Localized slumping is inferred from many steplike depressions on the steep outer banks. Although the meander system is as much as 500 m wide and has many characteristics typical of a fluvial system, extreme depth and evidence of episodic ongoing sedimentary processes preclude a true fluvial origin. Currents of unknown origin—that is, downcanyon turbidity flows—appear to be the only agent capable of sculpturing the observed features.A meander system was not observed in South Wilmington Canyon. Channel-floor features, including deformed and displaced sediment, support a previous suggestion of large-scale slumping in the area. These sediments include upturned clay beds, disaggregated gravels, loosely bound gravel conglomerates in a reddish-brown matrix, and a tubular structure, resembling a tree-root cast, within a thinly bedded, reddish-brown sandstone. 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.