1/17/2024 0 Comments Ocean trenches meaningA gas main being laid in a trenchĪ trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole or pit). L., eds., The Geology of Continental Margins, New York: Springer-Verlag, 207–211.For other uses of the word, see Trench (disambiguation). Von Huene, R., 1974, Modern trenches in Burk, C. Drake, eds., The Geology of Continental Margins. A., 1981, Tectonics, structure, and sedimentary framework of the Peru-Chile Trench, Geol. Stroudsburg, Penn.: Dowden, Hutchinson and Ross, 311–323. Kelling, eds., Sedimentation in Submarine Canyons, Fans, and Trenches. D., 1978b, Depositional patterns and channelized sedimentation in active eastern Pacific trenches, in D. D., 1978a, Extensional rupture of oceanic crust in the Chile Trench. G., 1980, Sedimentary masses and concepts about tectonic processes at underthrust margins, Geology 6, 564–568. S., 1970, Peru-Chile trench sediments and sea-floor spreading, Geol. D., 1975, Crustal rupture and the initiation of imbricate thrusting in the Peru-Chile Trench, Geol. R., 1973, Late Quaternary sedimentation in the active eastern Aleutian Trench, Geology 1(1), 19–22. Tulsa, Okla.: American Association of Petroleum Geologists (Mem. Lian, eds., Circum-Pacific Energy and Mineral Resources. A., 1976, Some shallow tectonic consequences of subduction and their meaning to the hydrocarbon explorationist, in M. and Noguchi, I., 1966, Sediments and structure of the Japan Trench, Jour. D., and von Huene, R., 1973, Initial Reports of the Deep Sea Drilling Project, vol. Tulsa, Okla.: Society of Economic Paleontologists and Mineralogists (Special Publ. Shaver, eds., Modern and Ancient Geosynclinal Sedimentation. A., 1974, Cenozoic sedimentary framework of the Gorda-Juan de Fuca Plate and adjacent continental margin-a review, in R. R., 1975, Subduction and accretion in trenches, Geol. C., 1975, Initial Reports of the Deep Sea Drilling Project, vol. Geophysics Union, (Geophysical Monograph) 12, 147–173.įisher, R. Hart, eds., The Crust and Upper Mantle of the Pacific Area. 1968, North Pacific sediment layers measured by seismic profiling, in L. H., and Lehner, P., 1974, Ocean, new frontier in exploration, Am. In cross-section, trenches are remarkably uniform asymmetric troughs with a relatively steep landward.īeck, R. Most trenches are arcuate, with the convex curvature outward from the continent or island arc. Examples of filled trenches are found off the Oregon-Washington coast ( Ewing et al., 1968 Kulm and Fowler, 1974) and southern Chile ( Scholl et al., 1970). Trenches can be completely filled by sediment if the rates of material supplied are extremely high. Island arc trenches are usually deeper than those associated with continents, ranging to more than 11,000 m deep in the Mariana Trench ( Fisher and Hess, 1963). Two main classes of oceanic trenches are commonly recognized: those associated with island arcs (e.g., the Mariana and Japan trenches) and those adjacent to continents (e.g.,the Peru-Chile and Middle Americatrenches). Oceanic trenches are narrow elongate depressions in the ocean floor that are usually associated with orogenic belts and that exhibit the maximum depths of the ocean.
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