Seismic geomorphology of three types of deepwater fans and their relationship with slope morphology: Qiongdongnan Basin, northern South China Sea
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Submarine canyon
Progradation
Continental Margin
Slumping
It is a widely held opinion that submarine canyons were cut during the glacial stages of low sea level and now are essentially dormant features, disturbed only on rare occasions by high-speed turbidity currents of torrential proportions. Published in 1979 after a 10-year study, this volume contradicts this concept of the canyons, with years of measurements of currents in the axes of canyons and in other types of sea valleys. It expands upon the previous publications of brief notes relative to currents measured in a few places on the deep seafloor, covering topics such as alternating current directions, turbidity currents, and crossvalley currents, clncluding with support data from studies of the California submarine canyons, British Columbia canyons, Mexican canyons, U.S. East Coast canyons, West indies canyons, Pacific Island canyons, and the Congo canyon.
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Ripple marks
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Continental Margin
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The configuration of sedimentary strata revealed by continuous seismic-reflection profiles over submarine canyons on the upper continental slope off Cape Hatteras is best explained by the hy pothesis of composite origin of submarine canyons. The canyons were originally incised into a post-Miocene (?) surface of unconformity. The intercanyon areas were constructed by deposition of sediment up to several hundred meters thick forming the canyon walls while the canyons were maintained by sediment removal processes over the sites of original incision. Canyon heads are presently buried under a smooth sediment cover which extends from the shelf break at about 90 m down to about 400 m below sea level, where the canyons emerge from the cover. The depth of emergence of canyons approximately coincides with the inferred level of no motion between the northeast-flowing Florida Current and the southwest-flowing Western Boundary Undercurrent.
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Continental Margin
Deposition
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Slumping
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Turbidity current
Continental Margin
Terrigenous sediment
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Submarine canyon
Slumping
Continental Margin
Passive margin
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It is a widely held opinion that submarine canyons were cut during the glacial stages of low sea level and now are essentially dormant features, disturbed only on rare occasions by high-speed turbidity currents of torrential proportions. Published in 1979 after a 10-year study, this volume contradicts this concept of the canyons, with years of measurements of currents in the axes of canyons and in other types of sea valleys. It expands upon the previous publications of brief notes relative to currents measured in a few places on the deep seafloor, covering topics such as alternating current directions, turbidity currents, and crossvalley currents, clncluding with support data from studies of the California submarine canyons, British Columbia canyons, Mexican canyons, U.S. East Coast canyons, West indies canyons, Pacific Island canyons, and the Congo canyon.
Submarine canyon
Turbidity current
Seafloor Spreading
Internal tide
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