Romanche Trench



The Romanche Trench, also called Romanche Furrow, Romanche Gap, or Romanche Fracture Zone, is the third deepest of the major trenches of the Atlantic Ocean, after the Puerto Rico Trench and the South Sandwich Trench. It dissects the Mid-Atlantic Ridge just north of the equator at the narrowest part of the Atlantic between Brazil and West Africa, extending from 2°N to 2°S and from 16°W to 20°W. The trench is part of a major transform fault zone that offsets the ridge. It is situated between the Sierra Leone Basin to the North and Northeast, the South Atlantic Basin to the East and Southeast, the Northern Brazilian Basin To the South and Southwest, and North Atlantic Ridge to the West and Northwest. Geologically, it is at the seam of the South American Plate to the West and the African Plate to the East. The trench has a depth of 7,760 m, is 300 km long and has an average width of 19 km and allows for a major circulation of deep ocean basin water from the west Atlantic to the east Atlantic basins. Deep water flow through the trench is from west to east with a rate of 3.6×106 m³/s of 1.57°C water.[1]

References

  • Schlitzer, Reiner, et.al.; 1985; A meridional 14C and 39Ar section in northeast Atlantic deep water; Journal of Geophysical Research, Volume 90, Issue C10, p. 6945-6952 abstract
oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor.

Trenches define one of the most important natural boundaries on the Earth’s solid surface, that between two lithospheric
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Atlantic Ocean is the second-largest of the world's oceanic divisions; with a total area of about 106.4 million square kilometres (41.1 million square miles), it covers approximately one-fifth of the Earth's surface.
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Puerto Rico Trench is an oceanic trench located on the boundary between the Caribbean Sea and the Atlantic Ocean. The trench is associated with a complex transition between the subduction zone to the south along the Lesser Antilles island arc and the major transform fault zone or
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The South Sandwich Trench is a deep arcuate trench in the South Atlantic Ocean lying 100 km to the east of the South Sandwich Islands. The trench is produced by the subduction of the southernmost portion of the South American Plate beneath the small South Sandwich Plate.
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Mid-Atlantic Ridge is a mostly underwater mountain range of the Atlantic Ocean and Arctic Ocean that runs from 87°N (about 333 km South of the North Pole) to subantarctic Bouvet Island at 54°S. The highest peaks of this mountain range extend above the water mark, to form islands.
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equator is an imaginary line on the Earth's surface equidistant from the North Pole and South Pole. It thus divides the Earth into a Northern Hemisphere and a Southern Hemisphere. The equators of other planets and astronomical bodies are defined analogously.
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A transform fault is a fault that is a special case of strike-slip faulting which terminates abruptly, at both ends, at a major transverse geological feature. Also known as a conservative plate boundary.
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South American Plate is a tectonic plate covering the continent of South America and extending eastward to the Mid-Atlantic Ridge.

The easterly side is a divergent boundary with the African Plate forming the southern part of the Mid-Atlantic Ridge.
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African Plate is a tectonic plate covering the continent of Africa and extending westward to the Mid-Atlantic Ridge.

The westerly side is a divergent boundary with the North American Plate to the north and the South American Plate to the south forming the central and
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