List of submarine topographical features
This is a list of submarine topographical features, oceanic landforms and topographic elements.
Abyssal plain
[edit]An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft). Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth.[1] Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills). In addition to these elements, active oceanic basins (those that are associated with a moving plate tectonic boundary) also typically include an oceanic trench and a subduction zone. Abyssal plains cover more than 33% of the ocean floor (about 23% of Earth's surface),[2] but they are poorly preserved in the sedimentary record because they tend to be consumed by the subduction process.[1][3][4]
The abyssal plain is formed when the lower oceanic crust is melted and forced upwards by the asthenosphere layer of the upper mantle. As this basaltic material reaches the surface at mid-ocean ridges, it forms new oceanic crust. Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt. Much of this sediment is deposited from turbidity currents that have been channeled from the continental margins along submarine canyons down into deeper water. The remainder of the sediment is composed chiefly of pelagic sediments.
Use of a continuously recording fathometer enabled Tolstoy & Ewing in the summer of 1947 to identify and describe the first abyssal plain.[1][5] This plain, located to the south of Newfoundland, is now known as the Sohm Abyssal Plain.[5] Following this discovery many other examples were found in all the oceans.[6][7][8][9][10]
List of abyssal plains and oceanic basins
[edit]Following is a list of named abyssal plains and oceanic basins:[1][11][12]
Oceanic trenches
[edit]
Oceanic trenches are long, narrow topographic depressions of the seabed. They are the deepest parts of the ocean floor, and they define one of the most important natural boundaries on the Earth's solid surface: the one between two lithospheric plates. Trenches are a distinctive morphological feature of plate boundaries. Trenches are found in all oceans with the exception of the Arctic Ocean and they are most common in the North and South Pacific Oceans.[2]
There are three types of lithospheric plate boundaries: 1.) divergent (where lithosphere and oceanic crust is created at mid-ocean ridges), 2.) convergent (where one lithospheric plate sinks beneath another and returns to the mantle), and 3.) transform (where two lithospheric plates slide past each other).
An oceanic trench is a type of convergent boundary at which two oceanic lithospheric slabs meet; the older (and therefore denser) of these slabs flexes and subducts beneath the other slab. Oceanic lithosphere moves into trenches at a global rate of about a tenth of a square meter per second. Trenches are generally parallel to a volcanic island arc, and about 200 km from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 10,911 m (35,798 ft) below sea level.
List of oceanic trenches
[edit]The following is a list of the deepest parts of the Earth's oceans and seas (all depths are measured from sea level):
| Name | Location | Depth (meters) | Depth (feet) | Depth (miles) | |
|---|---|---|---|---|---|
| 1 | Challenger Deep | Izu–Bonin–Mariana Arc, Mariana Trench, Pacific Ocean | 11,034 | 36,197 | 6.86 |
| 2 | Tonga Trench | Pacific Ocean | 10,882 | 35,702 | 6.76 |
| 3 | Emden Deep | Philippine Trench, Pacific Ocean | 10,545 | 34,580 | 6.54 |
| 4 | Kuril–Kamchatka Trench | Pacific Ocean | 10,542 | 34,449 | 6.52 |
| 5 | Kermadec Trench | Pacific Ocean | 10,047 | 32,963 | 6.24 |
| 6 | Izu–Ogasawara Trench | Pacific Ocean | 9,810 | 32,087 | 6.08 |
| 7 | Japan Trench | Pacific Ocean | 9,000 | 29,527 | 5.59 |
| 8 | Puerto Rico Trench | Atlantic Ocean | 8,605 | 28,232 | 5.35 |
| 9 | Yap Trench | Pacific Ocean | 8,527 | 27,976 | 5.30 |
| 10 | Richards Deep | Peru–Chile Trench, Pacific Ocean | 8,065 | 26,456 | 5.01 |
| 11 | Diamantina Deep | Diamantina fracture zone, Indian Ocean | 8,047 | 26,401 | 5.00 |
| 12 | Romanche Trench | Atlantic Ocean | 7,760 | 25,460 | 4.82 |
| 13 | Cayman Trough | Caribbean | 7,687 | 25,238 | 4.78 |
| 14 | Aleutian Trench | Pacific Ocean | 7,679 | 25,194 | 4.77 |
| 15 | Sunda Trench | Indian Ocean | 7,455 | 24,460 | 4.63 |
| 16 | Weber Deep | Banda Sea | 7,351 | 24,117 | 4.56 |
| 17 | South Sandwich Trench | Atlantic Ocean | 7,431 | 24,380 | 4.62 |
| 18 | Dordrecht Deep | Indian Ocean | 7,019 | 23,028 | 4.36 |
| 19 | Middle America Trench | Pacific Ocean | 6,669 | 21,880 | 4.14 |
| 20 | Puysegur Trench | Pacific Ocean | 6,300 | 20,700 | 3.9 |
| 21 | Vityaz Trench | Pacific Ocean | 6,150 | 20,177 | 3.8 |
| 22 | Sulu Trench | South China Sea | 5,600 | 18,400 | 3.48 |
| 23 | Litke Deep | Eurasian Basin*, Arctic Ocean | 5,450 | 17,881 | 3.39 |
| 24 | Manila Trench | South China Sea | 5,400 | 17,700 | 3.36 |
| 25 | Calypso Deep | Hellenic Trench, Mediterranean | 5,267 | 17,280 | 3.27 |
| 26 | Ryukyu Trench | Pacific Ocean | 5,212 | 17,100 | 3.24 |
| 27 | Murray Canyon* | Southern Ocean, Australia | 5,000 | 16,400 | 3.1 |
^* Entries marked are the deepest parts of their respective water bodies, but are not oceanic trenches.
Oceanic plateau
[edit]An oceanic plateau is a large, relatively flat submarine region that rises well above the level of the ambient seabed.[50] While many oceanic plateaus are composed of continental crust, and often form a step interrupting the continental slope, some plateaus are undersea remnants of large igneous provinces. Continental crust has the highest amount of silicon (such rock is called felsic). Oceanic crust has a smaller amount of silicon (mafic rock).
The anomalous volcanism associated with the formation of oceanic plateaux at the time of the Cenomanian–Turonian boundary (90.4 million years) ago may have been responsible for the environmental disturbances that occurred at that time. The physical manifestations of this were elevated atmospheric and oceanic temperatures, a significant sea-level transgression, and a period of widespread anoxia, leading to the extinction of 26% of all genera.[51] These eruptions would also have resulted in the emission of large quantities of carbon dioxide into the atmosphere, leading to global warming. Additionally, the emission of sulfur monoxide, hydrogen sulfide, carbon monoxide, and halogens into the oceans would have made seawater more acidic resulting in the dissolution of carbonate, and further release of CO2. This runaway greenhouse effect was probably put into reverse by the decline of the anomalous volcanic activity and by increased CO2-driven productivity in oceanic surface waters, leading to increased organic carbon burial, black shale deposition, anoxia and mass extinction in the ocean basins.[51]
List of oceanic plateaus
[edit]- Campbell Plateau (South Pacific)
- Challenger Plateau (South Pacific)
- Agulhas Plateau[52] (Southwest Indian)
- Caribbean–Colombian Plateau (Caribbean)
- Exmouth Plateau (Indian)
- Hikurangi Plateau (Southwest Pacific)
- Kerguelen Plateau (Indian)
- Manihiki Plateau (Southwest Pacific)
- Marquesas Plateau (Southwest Pacific)
- Mascarene Plateau (Indian)
- Naturaliste Plateau (Indian)
- Ontong Java Plateau (Southwest Pacific)
- Shatsky Rise (North Pacific)
- Vøring Plateau (North Atlantic)
- Wrangellia Terrane (Northeast Pacific)
- Yermak Plateau (Arctic)
Mid-ocean ridges
[edit]A mid-ocean ridge is a general term for an underwater mountain system that consists of various mountain ranges (chains), typically having a valley known as a rift running along its spine, formed by plate tectonics. This type of oceanic ridge is characteristic of what is known as an oceanic spreading center, which is responsible for seafloor spreading.
List of mid-ocean ridges
[edit]- Aden Ridge
- American–Antarctic Ridge
- Carlsberg Ridge
- Central Indian Ridge
- Chile Rise
- Cocos Ridge
- East Pacific Rise
- East Scotia Ridge
- Explorer Ridge
- Gakkel Ridge (Mid-Arctic Ridge)
- Gorda Ridge
- Juan de Fuca Ridge
- Knipovich Ridge (between Greenland and Spitsbergen)
- Kolbeinsey Ridge (North of Iceland)
- Mid-Atlantic Ridge
- Mohns Ridge
- Norfolk Ridge
- Pacific–Antarctic Ridge
- Palau–Kyushu Ridge
- Reykjanes Ridge (south of Iceland)
- Southeast Indian Ridge
- Southwest Indian Ridge
- West Mariana Ridge
See also
[edit]
- Physical oceanography
- Bathymetry
- Challenger Deep
- Hadal zone
- List of oceanic landforms
- List of submarine volcanoes
- Seamount
- Submarine canyon
References
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- ^ a b Harris P.T., MacMillan-Lawler M., Rupp J., Baker E.K. (2014). "Geomorphology of the oceans". Marine Geology. 352: 4–24. Bibcode:2014MGeol.352....4H. doi:10.1016/j.margeo.2014.01.011.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Craig R. Smith; Fabio C. De Leo; Angelo F. Bernardino; Andrew K. Sweetman & Pedro Martinez Arbizu (2008). "Abyssal food limitation, ecosystem structure and climate change" (PDF). Trends in Ecology and Evolution. 23 (9): 518–528. doi:10.1016/j.tree.2008.05.002. PMID 18584909. Archived from the original (PDF) on 20 July 2011. Retrieved 27 June 2010.
- ^ N.G. Vinogradova (1997). "Zoogeography of the Abyssal and Hadal Zones". The Biogeography of the Oceans. Advances in Marine Biology. Vol. 32. pp. 325–387. doi:10.1016/S0065-2881(08)60019-X. ISBN 978-0-12-026132-1.
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- ^ Bruce C. Heezen; Marie Tharp & Maurice Ewing (1962). "The Floors of the Oceans. I. The North Atlantic. Text to Accompany the Physiographic Diagram of the North Atlantic". In H. Caspers (ed.). Heezen, Bruce C., Marie Tharp, and Maurice Ewing: The Floors of the Oceans. I. The North Atlantic. Text to Accompany the Physiographic Diagram of the North Atlantic. With 49 fig., 30 plates. – New York, N.Y.: The Geological Society of America, Special Paper 65, 1959. 122 p. $10.00. Vol. 47. Weinheim: WILEY-VCH Verlag GmbH & Company. p. 487. doi:10.1002/iroh.19620470311. Retrieved 26 June 2010.
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Further reading
[edit]- Böggemann M. & Purschke G. (2005). "Abyssal benthic Syllidae (Annelida: Polychaeta) from the Angola Basin". Organisms Diversity & Evolution. 5 (Supplement 1): 221–226. doi:10.1016/j.ode.2004.11.006.
- Bohn, J.M. (2005). "On two rare abyssal Myriotrochidae (Echinodermata: Holothuroidea: Apodida) new to the South Atlantic: Siniotrochus myriodontus Gage and Billet, 1986 and Lepidotrochus parvidiscus angolensis subsp. nov". Organisms Diversity & Evolution. 5 (Supplement 1): 231–238. doi:10.1016/j.ode.2004.11.008.
- Brandt A.; Brenke N.; Andres H.-G.; Brix S.; Guerrero-Kommritz J.; Mühlenhardt-Siegel U. & Wägele J.-W. (2005). "Diversity of peracarid crustaceans (Malacostraca) from the abyssal plain of the Angola Basin". Organisms Diversity & Evolution. 5: 105–112. doi:10.1016/j.ode.2004.10.007.
- Gad G. (2005). "Giant Higgins-larvae with paedogenetic reproduction from the deep sea of the Angola Basin- evidence for a new life cycle and for abyssal gigantism in Loricifera?". Organisms Diversity & Evolution. 5 (Supplement 1): 59–76. doi:10.1016/j.ode.2004.10.005.
- Gill Adrian E. (1982). Atmosphere-Ocean Dynamics. San Diego: Academic Press. ISBN 978-0-12-283520-9.
- Gooday A.J.; Nomaki H. & Kitazato H. (2008). "Modern deep-sea benthic foraminifera: a brief review of their morphology-based biodiversity and trophic diversity". Geological Society, London, Special Publications. 303 (1): 97–119. Bibcode:2008GSLSP.303...97G. doi:10.1144/SP303.8. S2CID 129698419.
- Gooday A.J., Kamenskaya O.E. & Cedhagen T. (2007). "New and little-known Komokiacea (Foraminifera) from the bathyal and abyssal Weddell Sea and adjacent areas". Zoological Journal of the Linnean Society. 151 (2): 219–251. doi:10.1111/j.1096-3642.2007.00326.x.
- Gooday A.J. & Malzone G. (2004). "Hyperammina micaceus sp. nov.: a new foraminiferan species (Protista) from the Porcupine Abyssal Plain, Northeast Atlantic". Journal of Micropalaeontology. 23 (2): 171–179. Bibcode:2004JMicP..23..171G. doi:10.1144/jm.23.2.171.
- Janussen D. & Tendal O.S. (2007). "Diversity and distribution of Porifera in the bathyal and abyssal Weddell Sea and adjacent areas". Deep-Sea Research Part II. 54 (16–17): 1864–1875. Bibcode:2007DSRII..54.1864J. doi:10.1016/j.dsr2.2007.07.012.
- Markhaseva E.L. & Schulz K. (2006). "Sensiava longiseta (Copepoda, calanoidea): a new genus and species from the abyssal of the Weddell Sea". Zootaxa. 1368: 1–18. doi:10.11646/zootaxa.1368.1.1.
- Mühlenhardt-Siegel U. (2008). "Phalloleucon abyssalis, a new cumacean genus and species (Crustacea: Peracarida: Leuconidae) from the Peru Basin". Zootaxa (1829). pp. 61–68.
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External links
[edit]- Monterey Bay Aquarium Research Institute (3 November 2009). "Deep-sea Ecosystems Affected By Climate Change". Science Daily.
