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1 Department of Earth Sciences, University of Ottawa, Marion Hall, 365 Nicholas Street, Ottawa, Ontario K1N 6N5, Canada; present address: Department of Earth and Environmental Sciences, Tulane University, Dinwiddie Hall, New Orleans, Louisiana 70118, U.S.A.; leclair{at}tulane.edu
2 Department of Earth Sciences, University of Ottawa, Marion Hall, 365 Nicholas Street, Ottawa, Ontario K1N 6N5, Canada
Experiments were conducted in order to investigate processes of sediment transport and deposition from sustained turbidity currents with initial volume-fraction sediment concentration of 0.20, 0.25, and 0.35. Parallel lamination was formed at bed-aggradation rates up to 4 mm s-1 and bedload-layer sediment concentration up to 0.36. This observation contradicts the generally held assumption that parallel lamination forms only from low-density flows and at low bed-aggradation rates. This misconception illustrates a poor understanding of threshold values of grain-support mechanisms in the bedload layer. The present results bring new insight into understanding sediment transport in the deep sea and interpreting the sedimentary record.
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