Academic Commons

Articles

Contourite or turbidite?: magnetic fabric of fine-grained Quaternary sediments, Nova Scotia continental rise

Shor, Alexander N.; Kent, Dennis V.; Flood, Roger D.

Samples of three piston cores and one gravity core from the Nova Scotia continental rise (depths 4210-4925 m) have been examined to differentiate parallel-to-slope and downslope depositional processes in Quaternary deposits from a region presently influenced by a strong contour current. Measurement of anisotropy of magnetic susceptibility of samples of a red-brown, silt-laminated lutite 'contourite' facies shows grain alignments which are consistent with both parallel-to-slope (contour current) flow and downslope (turbidity current) flow. We believe that these results provide support for the hypothesis that 'geologically significant' contour currents have influenced continental rise deposition during the Pleistocene. However, our observation that both alongslope and downslope alignments are present in lithologically similar units clearly demonstrates the need for studies on the relationship between lithofacies and process in this geological setting.

Geographic Areas

Files

Also Published In

Title
Fine-Grained Sediments: Deep Water Processes and Facies
Publisher
Blackwell
DOI
https://doi.org/10.1144/GSL.SP.1984.015.01.17

More About This Work

Academic Units
Lamont-Doherty Earth Observatory
Series
Geological Society Special Publication, 15
Published Here
February 3, 2012
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.