Results 141 to 150 of about 1,847 (188)

Contourites in Lake Superior

Geology, 1980
Contour currents influence sedimentation in an area 15 km wide and 65 km long at the base of the slope off the Keweenaw Peninsula in Lake Superior, northwestern Michigan. Seismic-reflection profiles (3.5 kHz) from this area show distinct wavy reflectors in a scoured trough at a depth of 200 m at the base of the slope, hyperbolic echoes adjacent to the ...
Thomas C. Johnson, Thomas W. Carlson, James E. Evans   +2 more
openaire   +1 more source

North Atlantic contourite sand channels

Geological Society, London, Special Publications, 2007
Abstract Two sand-rich channelized depositional systems, formed by strong contour currents, were studied west of the Faeroe Bank Channel and in the Gulf of Cadiz. Both are areas beyond the exit of constrictions where water overflows from the Norwegian Sea and the Mediterranean Sea, respectively.
Akhmetzhanov, A., Kenyon, N.H., Habgood, E., Van der Mollen, A.S., Nielsen, T., Ivanov, M., Shashkin, P.   +6 more
openaire   +2 more sources

The micropaleontological fingerprint on contourites and turbidites

2021
Bottom current-induced sediments such as contourites contain fundamental information for reconstructions of water mass properties and ocean circulation. The distinction between contourites and other deposits on continental slopes is particularly complex in areas where downslope and along-slope sedimentary processes co-occur. Clear and easily applicable
Schmidt , Johanna, Saupe , Anna, Petersen , Jassin, Bahr , André, Grunert , Patrick   +4 more
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North Atlantic contourites: an overview

Geological Society, London, Special Publications, 1984
Summary We present a brief overview of known bottom circulation and Tertiary to Recent sediment drifts in the North Atlantic Ocean, and outline the distinctive features of contourite sediments recovered from these drifts. There is a gradation of structural and textural characteristics between the finer-grained clayey and muddy contourites and
D. A. V. Stow, J. A. Holbrook
openaire   +1 more source

Contour Currents and Contourite Drifts

2011
Abstract This chapter provides a current state-of-the-art on the contourite systems with a major focus on the modern systems (drifts), the processes of deposition and the diagnostic sedimentological and seismic features. A short overview of the ancient contourite problem is also provided. Firstly, the history of contourites is briefly reminded since
Jean-Claude Faugères, Thierry Mulder
openaire   +1 more source

Contourite Drifts and Associated Bedforms

2017
Contourites, also known as alongslope deposits, are sediments that have been deposited or significantly affected by the persistent action of contour (bottom) currents. Contourite drifts are the large-scale morphological expression of contourite deposition, up to 106 km2 in area and >1 km in thickness.
Ibimina Esentia, Dorrik Stow, Zeinab Smillie   +2 more
openaire   +1 more source

Characteristics of modern carbonate contourite drifts

Sedimentology, 2019
AbstractCarbonate environments inhabit the realm of the surface, intermediate and deep currents of the ocean circulation where they produce and continuously deliver material which is potentially deposited into contourite drifts. In the tropical realm, fine‐grained particles produced in shallow water and transported off‐bank by tidal, wind‐driven, and ...
Gregor P. Eberli, Christian Betzler
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The Lofoten contourite drift off Norway

Marine Geology, 1999
Abstract Based on high-resolution and multichannel seismic data, a contourite drift, the Lofoten Drift, has been identified below ca. 1000 m water depth on the continental slope off Norway. The Lofoten Drift has a maximum thickness of about 360 m. Correlation to published seismic stratigraphy implies a Neogene age.
J.S Laberg, T.O Vorren, S.-M Knutsen
openaire   +1 more source

Contour Currents and Contourites of the Middle Caspian

Doklady Earth Sciences, 2018
Experimental data have shown that the cyclonic circulation in the Middle Caspian is a seasonal contour current surrounding the Middle Caspian megabasin along the slope during the cold half of the year. This current and the enormous influx of suspended particulate matter on the western slope of the Middle Caspian Basin provide conditions for the ...
A. K. Ambrosimov, L. I. Lobkovsky, A. G. Rosljakov   +2 more
openaire   +1 more source

Seismic features diagnostic of contourite drifts

Marine Geology, 1999
Abstract The sedimentary construction of oceanic margins is most often carried out by the combined action of gravitational processes and processes related to bottom (contour) currents. One of the major difficulties encountered in the interpretation of seismic profiles crossing such margins is the differentiation of these two types of deposit ...
Jean-Claude Faugères, Dorrik A.V Stow, Patrice Imbert, Adriano Viana   +3 more
openaire   +1 more source