Sedimentation under deep-sea storms

  title={Sedimentation under deep-sea storms},
  author={Charles D. Hollister and I. Nick McCave},
Fast currents, high concentrations of suspended sediment and grooved mud beds are associated with erosion in frequent abyssal storms where a fast deep mean flow is augmented (or reversed) by intense intermittent currents. This occurs about 5 km below the Gulf Stream or its rings. The waning phase of a storm results in development of bedforms and rapid deposition of a mud blanket. Several other regions of the world ocean display evidence of abyssal storm activity. 
Evidence for Sediment Eruption on Deep Sea Floor, Gulf of Mexico
Deep-tow high-resolution imagery shows that the crater is cut into a low hill surrounded by near-surface concentric faults, which may be related to mud diapirism or intrusion of gas hydrates into near- surface sediments.
Boundary current-controlled turbidite deposition: A sedimentation model for the Southern Nares Abyssal Plain, Western North Atlantic
Examination of 38 sediment cores, bottom photographs, 7,000 km of 3.5 kHz reflection profiles and other seismic data from the southern part of the Nares Abyssal Plain suggests that complex
A deep-sea sediment transport storm
Photographs taken of the sea bottom since the 1960s suggest that sediments at great depth may be actively resuspended and redistributed1. Further, it has been suspected that active
Turbulent suspension of sediments in the deep sea
  • T. Gross, A. R. Nowell
  • Environmental Science
    Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1990
The high-energy benthic boundary layer experiment demonstrated the existence of high energy events capable of suspending large amounts of sediment at the base of the Nova Scotian Rise. The currents
Mixed biosiliceous-terrigenous sedimentation under the Antarctic Circumpolar Current, Scotia Sea
  • C. Pudsey, J. Howe
  • Environmental Science, Geography
    Geological Society, London, Memoirs
  • 2002
Abstract Sediment supply to the Scotia Sea is controlled by the east-flowing Antarctic Circumpolar Current (ACC) with some Weddell Gyre influence in the south. Near-bottom flow is unsteady with
Observations of a fast burst of the deep western boundary undercurrent and sediment transport in South Wilmington Canyon from DSRVAlvin
On October 3 and 4, 1986, DSRVAlvin dives encountered a strong current at 2,300 m in South Wilmington Canyon. The current, estimated at 1 knot, transported surficial sediment and constructed and
Instability-Driven Benthic Storms below the Separated Gulf Stream and the North Atlantic Current in a High-Resolution Ocean Model
Benthic storms are important for both the energy budget of the ocean and for sediment resuspension and transport. Using 30 years of output from a high-resolutionmodel of the NorthAtlantic, it is


Anomalous Bottom Water South of the Grand Banks Suggests Turbidity Current Activity
Highly turbid bottom water at the margin of the Sohm Abyssal Plain was identified by its temperature, salinity, and oxygen content as originating upslope on the continental rise, suggesting a turbidity current as the agent bringing this water downslope.
Benthic storms: temporal variability in a deep-ocean nepheloid layer.
Time series measurements of light scattering were made for 2(1/2) months at 20 meters above the bottom in the western North Atlantic. The highest values recorded with the nephelometer exceeded all
Correlation Between Surface Gulf Stream and Bottom Flow New 5000 Meters Depth
Abstract Spectral analyses of three long-term (8 months), deep (∼5 km), current-meter records located on the Scotian Rise (∼40°N, 62°W) and a time series of the average northerly position of the
Influences of Norwegian Sea overflow water on sedimentation in the northern North Atlantic and Labrador Sea
Reflection profiles and hydrographic data indicate that sedimentation in parts of the northernmost Atlantic and in the Labrador basin has been largely governed by the movement of bottom water derived
Excepftonally Strong Near-Bottom Flows on the Continental Rise of Nova Scotia
Recent current velocity measurements across the lower continental rise of Nova Scotia show a deep equatorwardflow with speeds (maximum, 73 centimeters per second) among the highest recorded for the
Shaping of the Continental Rise by Deep Geostrophic Contour Currents
Geostrophic contour-following bottom currents involved in the deep thermohaline circulation of the world ocean appear to be the principal agents which control the shape of the continental rise and
New evidence for occurrence of debris flow deposits in the deep sea
Clearly defined debris flow deposits generated by a large sediment slide or slides off the Spanish Sahara have been identified on the lower continental rise west of the Canary Islands. The debris
Bathymetry, Microphysiography and Reflectivity Characteristics of the West African Margin Between Sierra Leone and Mauritania
This report maps and analyzes the bathymetry and seafloor reflectivity characteristics along the northwest African margin between 3° and 23°N. The bathymetric trends strongly suggest that the