alexa Role of submarine canyons on shelfbreak erosion and sedimentation: modern and ancient examples.
Agri and Aquaculture

Agri and Aquaculture

Journal of Marine Science: Research & Development

Author(s): John Warme, Richard

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Heads of submarine canyons may occur anywhere on continental margins, from river mouths to continental slopes, producing a distinctive interface between shallow- and deep-marine environments. Inception of most canyons is subaerial, fluvially cut during lowered sealevel. Submarine mass flow also commences canyon formation. Submarine erosion shapes all canyons, and is especially effective in the headward region. Sliding and slumping are volumetrically most important as erosive agents, but sand spillover, bioerosion, sand flow, sand creep, and debris flow all play a part. Fluctuating channelized currents and low-velocity turbidity currents also erode and transport sediments. Canyons alter shelfbreak circulation and sedimentation. The Pigeon Point and Carmelo Formations of coastal California and Tethyan submarine canyons of Czechoslovakia display fining-upward canyon fills. Contrasting fill sequences include coarse-grained units that dominate French Maritime Alps and New Zealand canyon complexes, and shales that plug canyons in the Gulf Coast, Sacramento Valley, and Israel. Shelf size and gradient, rates of eustacy, tectonism, and subsidence, and sedimentary-source input and migration interact to create this diversity of fills in ancient submarine canyons.-from Authors

This article was published in Society of Economic Paleontologists and Mineralogists and referenced in Journal of Marine Science: Research & Development

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