Lomilik

Last updated
Lomilik
Micronesia and Marshall islands bathymetry, Lomilik and Lami.png
Bathymetry of Lomilik and Ļami Seamounts
Marshall Islands location map.svg
Red triangle with thick white border.svg
Location in the Marshall Islands
Summit depth1,350 metres (4,430 ft)
Location
Coordinates 11°42′N161°37′E / 11.700°N 161.617°E / 11.700; 161.617
CountryMarshall Islands

Lomilik is a seamount in the Western Pacific Ocean, within the exclusive economic zone of the Marshall Islands. [1] It lies to the west of Enewetak atoll [2] and is named after the best fishing site in Anewetak atoll. [3]

Lomilik has a 40-by-15-kilometre-wide (24.9 mi × 9.3 mi) summit terrace with the proper summit at circa 1,500 metres (4,900 ft) depth; a scarp separates the two and small hills reach depths of 1,350 metres (4,430 ft). The summit terrace is covered by rocks with ooze in between. A notch in the southern flank of Lomilik was likely created by a landslide. [2] [4] It is part of the Magellan Seamounts [5] and consists of a Cretaceous volcano with a thin layer of carbonate rocks and ferromanganese. [6] Lami seamount lies northwest of Lomilik. [7]

The rocks found on Lomilik consist of basalt and limestone. [8] Fluorapatite, hyaloclastite, [9] mudstone, phosphorite and siltstone have been identified in rocks from the seamount. [10] Manganese nodules have been found on Lomilik [1] and the manganese crusts on the seamount reach thicknesses of over 10 centimetres (3.9 in); [11] the thickest crust recovered from an ocean is a 18 centimetres (7.1 in) thick ferromanganese crust from Lomilik recovered in 1989. [2] The deposits on Lomilik could potentially be mined. [12]

Related Research Articles

<span class="mw-page-title-main">South Korea at the 1992 Summer Olympics</span> Sporting event delegation

South Korea competed as Korea at the 1992 Summer Olympics in Barcelona, Spain. 226 competitors, 154 men and 72 women, took part in 134 events in 24 sports.

<span class="mw-page-title-main">Musicians Seamounts</span> Chain of seamounts in the Pacific Ocean, north of the Hawaiian Ridge

Musicians Seamounts are a chain of seamounts in the Pacific Ocean, north of the Hawaiian Ridge. There are about 65 seamounts, some of which are named after musicians. These seamounts exist in two chains, one of which has been attributed to a probably now-extinct hotspot called the Euterpe hotspot. Others may have formed in response to plate tectonics associated with the boundary between the Pacific Plate and the former Farallon Plate.

Bounty Seamount is a seamount in the Pacific Ocean, which reaches a depth of 420 metres (1,380 ft) or 450 metres (1,480 ft). It is about 3,950 metres (12,960 ft) high.

<span class="mw-page-title-main">Wōdejebato</span> Guyot in the Marshall Islands northwest of the smaller Pikinni Atoll

Wōdejebato is a Cretaceous guyot or tablemount in the northern Marshall Islands, Pacific Ocean. Wōdejebato is probably a shield volcano and is connected through a submarine ridge to the smaller Pikinni Atoll 74 kilometres (46 mi) southeast of the guyot; unlike Wōdejebato, Pikinni rises above sea level. The seamount rises for 4,420 metres (14,500 ft) to 1,335 metres (4,380 ft) depth and is formed by basaltic rocks. The name Wōdejebato refers to a sea god of Pikinni.

<span class="mw-page-title-main">Limalok</span> Cretaceous-Paleocene guyot in the Marshall Islands

Limalok is a Cretaceous-Paleocene guyot/tablemount in the southeastern Marshall Islands, one of a number of seamounts in the Pacific Ocean. It was probably formed by a volcanic hotspot in present-day French Polynesia. Limalok lies southeast of Mili Atoll and Knox Atoll, which rise above sea level, and is joined to each of them through a volcanic ridge. It is located at a depth of 1,255 metres (4,117 ft) and has a summit platform with an area of 636 square kilometres (246 sq mi).

<span class="mw-page-title-main">Lo-En</span> Albian–Campanian guyot in the Marshall Islands in the Pacific Ocean

Lo-En or Hess is an Albian–Campanian guyot in the Marshall Islands. One among a number of seamounts in the Pacific Ocean, it was probably formed by a hotspot in what is present-day French Polynesia. Lo-En lies southeast of Eniwetok which rises above sea level, and Lo-En is almost connected to it through a ridge.

<span class="mw-page-title-main">Ruwitūn̄tūn̄</span> Guyot in the Marshall Islands in the Pacific Ocean

Ruwitūn̄tūn̄ is a guyot in the Pacific Ocean which reaches a depth of 1,215 metres (3,986 ft) below sea level. It is capped off with a summit platform covered in sediments and some volcanic pinnacles with craters. Basaltic rocks have been found on Ruwitūn̄tūn̄.

MIT Guyot is a guyot in the Pacific Ocean that rises to a depth of 1,323 metres (4,341 ft). It has a 20-kilometre-long (12 mi) summit platform and formed during the Cretaceous in the region of present-day French Polynesia through volcanic eruptions.

<span class="mw-page-title-main">Ioah Guyot</span> Seamount in the Pacific Ocean

Ioah Guyot is a seamount in the Pacific Ocean, close to the Marshall Islands. Part of the Magellan Seamounts, it is a shield volcano that has erupted alkali basalt and hawaiite 87 million years ago, but may have continued erupting into the Miocene. During the Cretaceous, reefs developed on the guyot.

<span class="mw-page-title-main">Pako Guyot</span> Guyot in the Pacific Ocean

Pako Guyot is a guyot in the Pacific Ocean.

<span class="mw-page-title-main">Ita Mai Tai</span> Seamount in the Pacific Ocean

Ita Mai Tai is a Cretaceous-early Cenozoic seamount northwest of the Marshall Islands and north of Micronesia. One among a number of seamounts in the Pacific Ocean, it is part of the Magellan Seamounts which may have a hotspot origin although Ita Mai Tai itself may not have formed on a hotspot.

<span class="mw-page-title-main">Resolution Guyot</span> Underwater tablemount in the Pacific Ocean

Resolution Guyot is a guyot (tablemount) in the underwater Mid-Pacific Mountains in the Pacific Ocean. It is a circular flat mountain, rising 500 metres (1,600 ft) above the seafloor to a depth of about 1,320 metres (4,330 ft), with a 35-kilometre-wide (22 mi) summit platform. The Mid-Pacific Mountains lie west of Hawaii and northeast of the Marshall Islands, but at the time of its formation, the guyot was located in the Southern Hemisphere.

<span class="mw-page-title-main">Horizon Guyot</span> Tablemount in the Pacific Ocean

Horizon Guyot is a presumably Cretaceous guyot (tablemount) in the Mid-Pacific Mountains, Pacific Ocean. It is an elongated ridge, over 300 kilometres (190 mi) long and 4.3 kilometres (2.7 mi) high, that stretches in a northeast-southwest direction and has two flat tops; it rises to a minimum depth of 1,443 metres (4,730 ft). The Mid-Pacific Mountains lie west of Hawaii and northeast of the Line Islands.

<span class="mw-page-title-main">Lemkein</span> Seamount in the Pacific Ocean

Lemkein is a seamount in the Western Pacific Ocean, west of Kwajalein.

<span class="mw-page-title-main">Ujlān volcanic complex</span> Seamount in the Pacific Ocean

Ujlān volcanic complex is a group of seamounts in the Marshall Islands. The complex consists of the seamounts Ļajutōkwa, Ļalibjet, Likelep, Ļotāb and Ujlān which with a minimum depth of 1,250 metres (4,100 ft) is the shallowest part of the complex; sometimes Ujelang Atoll is also considered to be a part of the complex; Eniwetok atoll and Lo-En seamount form a cluster together with this volcanic complex.

Vlinder Guyot is a guyot in the Western Pacific Ocean. It rises to a depth of 1,500 metres (4,900 ft) and has a flat top covering an area of 40 by 50 kilometres. On top of this flat top lie some volcanic cones, one of which rises to a depth of 551 metres (1,808 ft) below sea level. Vlinder Guyot has noticeable rift zones, including an older and lower volcano to the northwest and Oma Vlinder seamount south.

Echo Bank is an underwater mountain, part of the Canary Islands Seamount Province and located southwest of the Canary Islands. Of uncertain geologic origin, it is part of a larger cluster of submarine mountains and rises to a depth of 255 metres (837 ft) below sea level. It has a flat top, indicating that it formerly might have emerged from the sea.

Tropic Seamount is a Cretaceous seamount, part of the Canary Islands Seamount Province. It is located west of the Western Sahara's coastline and southwest of the Canary Islands, north of Cape Verde. It is one of a number of seamounts in this part of the Atlantic Ocean, probably formed by volcanic processes triggered by the proximity to the African continent. Tropic Seamount is located at a depth of 970 metres (3,180 ft) and has a summit platform with an area of 120 square kilometres (46 sq mi).

<span class="mw-page-title-main">Krylov Seamount</span> Seamount in the Atlantic Ocean

Krylov Seamount is a volcanic seamount in the Atlantic Ocean, west of the Cape Verde islands. It is formed by one seamount and one ridge which are separated by a 5 kilometres (3.1 mi) wide depression, and it rises to a minimum depth of 1,240 metres (4,070 ft); formerly the depression was interpreted to be a caldera. The seamount probably formed no later than 70-75 million years ago before sinking to its current depth.

References

  1. 1 2 Hein, J.R.; Koschinsky, A. (2014-01-01). "Deep-Ocean Ferromanganese Crusts and Nodules". Treatise on Geochemistry. p. 274. doi:10.1016/B978-0-08-095975-7.01111-6. ISBN   9780080983004.
  2. 1 2 3 Hein et al. 1998, p. 2.
  3. Hein et al. 1990, p. 245.
  4. Hein et al. 1999, p. 3.
  5. Hyeong, Kiseong; Kim, Jonguk; Yoo, Chan Min; Moon, Jai-Woon; Seo, Inah (December 2013). "Cenozoic history of phosphogenesis recorded in the ferromanganese crusts of central and western Pacific seamounts: Implications for deepwater circulation and phosphorus budgets". Palaeogeography, Palaeoclimatology, Palaeoecology. 392: 294. Bibcode:2013PPP...392..293H. doi:10.1016/j.palaeo.2013.09.012. ISSN   0031-0182.
  6. Kim, Jonguk; Hyeong, Kiseong; Jung, Hoi-Soo; Moon, Jai-Woon; Kim, Ki-Hyune; Lee, Insung (1 December 2006). "Southward shift of the Intertropical Convergence Zone in the western Pacific during the late Tertiary: Evidence from ferromanganese crusts on seamounts west of the Marshall Islands". Paleoceanography. 21 (4): 2. Bibcode:2006PalOc..21.4218K. doi: 10.1029/2006PA001291 . ISSN   1944-9186.
  7. Hein et al. 1990, p. 108.
  8. Hein et al. 1998, p. 4.
  9. Hein, James R.; Koschinsky, Andrea; Halbach, Peter; Manheim, Frank T.; Bau, Michael; Kang, Jung-Keuk; Lubick, Naomi (1997). "Iron and manganese oxide mineralization in the Pacific". Geological Society, London, Special Publications. 119 (1): 127. Bibcode:1997GSLSP.119..123H. doi:10.1144/GSL.SP.1997.119.01.09. ISSN   0305-8719. S2CID   128892570.
  10. Hein, James R.; Benninger, Laura M. (2000). Diagenetic Evolution of Seamount Phosphorites (Report). p. 248.
  11. Hein et al. 1990, p. 32.
  12. Hein et al. 1999, p. 14.

Sources