. Collected reprints, Essa Institute for Oceanography. Oceanography MODERR ACTFVE PARALIC mm COKTINENTAL TERRACE 10 MILES. Fig. 4.—The prograding of a paralic wedge across the outer shelf to build up a large composite wedge may be another elfective wa}' of maintaining a sedimentary continental slope in a clastic regime. The shoreface of a paralic wedge is considerably steeper than the general surface itself and is similar to that of gentle continen- tal slopes. There is no difficulty in accounting for the steepness of Atlantic-type continental slopes, usually little more than abo
. Collected reprints, Essa Institute for Oceanography. Oceanography MODERR ACTFVE PARALIC mm COKTINENTAL TERRACE 10 MILES. Fig. 4.—The prograding of a paralic wedge across the outer shelf to build up a large composite wedge may be another elfective wa}' of maintaining a sedimentary continental slope in a clastic regime. The shoreface of a paralic wedge is considerably steeper than the general surface itself and is similar to that of gentle continen- tal slopes. There is no difficulty in accounting for the steepness of Atlantic-type continental slopes, usually little more than about 3°, when the rocks are carbonates. The sides of coral reefs are invariably steeper than the flanks of their steep volcanic seamount foundations and commonly attain slopes as great as 20°. It is more difficult to account for the continental slope when the terrace wedges are composed of elastics. However, this may be explained by the fact that the stacking of prograded paralic wedges for the shoreface under the influence of surf is cjuite steep (fig. 4). help account for the declivity. A final solti- tion to this problem remains elusive. The cause for the stibsiding foundation of a terrace wedge is another intriguing Cjues- tion. The growth of the wedge must be a response to, rather than a cause of, this marginal flexing, if isostasy is operating, for the mantle being displaced is denser ( gm/cm^) than the sediments being deposited (ca. gm/cm^). The sediments, of course, do accentuate the subsidence. But regardless of its ultimate cause, this "certain sinking feeling" seems to be a fact of life for non- orogenic continental Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratorie
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