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oceanic plateau

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oceanic plateau

 or submarine plateau

Large submarine elevation rising sharply at least 660 ft (200 m) above the surrounding seafloor and having an extensive, relatively flat or gently tilted summit. Most plateaus are steplike interruptions of the continental slopes. Some, however, occur well beyond the continental margins. They stand alone, high above the surrounding seafloor, and are believed to be fragments of continents that were isolated during continental drift and seafloor spreading.
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The other components contain "materials" such as basaltic ocean floor (HIMU), pelagic sediments (EM1), oceanic plateaus (EM1), subcontinental lithosphere (EM1, EM2), terrigenous sediments or subducted continental crust (EM2), which have been recycled by subduction processes, and mixed back into the depleted mantle.
Igneous rock associations 5. oceanic island volcanism II: mantle ... by Mallory-Greenough, Leanne M. / Geoscience Canada
Oceanic plateaus, so-called large igneous provinces, formed mostly during the mid-Cretaceous period 100 million to 140 million years ago when massive amounts of material burst through tectonic plates, venting heat and magmatic gases from Earth's interior.
A sea change in ocean drilling: scientists launch a new drill ship ... by Normile, Dennis; Kerr, Richard A. / Oceanus
These plumes -- the geologic equivalent of burps -- are streams of rock that rise from the deep mantle and erupt at the surface as basalt volcanoes, creating such features as the Hawaiian Islands and submerged oceanic plateaus.
Earth burps and magnetic flips by Monastersky, Richard / Science News
 
 
 
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