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Coarse-Tail Graded, Structureless Strata: Indicators of an Internal Hydraulic Jump

By
Suzanne F. Leclair
Suzanne F. Leclair
Department of Earth Sciences University of Ottawa Ottawa, Ontario, K1N 6N5 Canada
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R. William C. Arnott
R. William C. Arnott
Department of Earth Sciences University of Ottawa Ottawa, Ontario, K1N 6N5 Canada
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Published:
December 01, 2013

Enigmatic strata were observed intercalated with otherwise thin-bedded ‘classic’ turbidites in the Isaac Formation of the Neoproterozoic Windermere Supergroup in the southern Canadian Cordillera. To understand better the origin of these sharp-, planarbased, structureless, coarse-tail graded strata containg grains up to 0.5 mm and bed thickness up to ~0.30 m, experiments were conducted to replicate the conditions during deposition. In particular, the effect of an internal hydraulic jump on deposition from high-density (20% and 35% volume-sediment concentration), silt-sand, turbid bottom currents was investigated. Video records showed that turbulence generated in the hydraulic jump entrained coarse- and fine-grained sediment from the bed and temporarily maintained them in suspension. Analysis of the subsequent deposit, as photographed through the experimental-tank glass walls or seen on sediment epoxy peels, revealed faintly banded, graded strata in which sand grains float in a matrix of silt, similar to that observed in the Neoproterozoic outcrop examples. Strata like these should be easily recognized in core and therein indicate deposition in a hydraulic jump of a high-density sediment-laden flow.

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GCSSEPM

Shelf Margin Deltas and Linked Down Slope Petroleum Systems–Global Significance and Future Exploration Potential

Harry H. Roberts
Harry H. Roberts
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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Richard H. Fillon
Richard H. Fillon
Houston, Texas
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John B. Anderson
John B. Anderson
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
23
ISBN electronic:
978-0-9836096-7-4
Publication date:
December 01, 2013

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