List of seamounts in the Marshall Islands explained

The Marshall Islands are the site of a number of seamounts. These volcanoes form several groups, including the Ralik Chain, the Ratak Chain and some seamounts around Anewetak. These seamounts are in turn part of a larger province that extends from the South Pacific to the Mariana Trench and is characterized by unusually shallow ocean ground.

These seamounts and volcanoes do not have simple hotspot-like age progressions, with some volcanoes being younger than one would expect from age progression and having more than one active episode. In some places, a middle Cretaceous and a late Cretaceous episode of volcanic activity have been determined by radiometric dating. Despite this, some hotspot-based genesis models have been formulated, often implying that French Polynesian hotspots are responsible for the formation of seamounts, with the Society hotspot, Rurutu hotspot, Rarotonga hotspot and the Macdonald hotspot being candidate hotspots responsible for the development of the Marshall Islands seamounts. Such linkages are in part supported by geochemical data. Some discrepancies between the age and position of such seamounts and the predictions of the hotspot model may reflect the activity of short-lived hotspots linked to large mantle plumes that produce more than one hotspot.

Name Other names Etymology Coordinates Depth below sea level Age Volume Details
Aean̄-Kaņ Marovoiy A taboo fishing spot at Eniwetok14.883°N 187.38°W. Since the Eocene manganese nodules developed on the seamount, which may have been created by the Macdonald hotspot.
Neen-Koiaak According to legend, the fastest runner in the Marshall Islands14.377°N 162.16°W102 million yearsSamples dredged from Neen-Koiaak include hawaiite containing clinopyroxene, olivine and plagioclase.
Wōd-Eņ Rok South-Wod-En A coral head15.22°N 163°W76 million yearsWhile its position makes it a candidate member of the Ralik hotspot trail, it appears to be too old. There is some geochemical similarity to the Rurutu hotspot.
Wōd-Eņ Iōn̄ North-Wod-En, Nazimova A coral head16.1°N 165.4°W86 million yearsWhile its position makes it a candidate member of the Ralik hotspot trail, it appears to be too old. There is some geochemical similarity to the Rurutu hotspot.
Ļewa A person who received canoe building knowledge, one of the first two14.03°N 170.8°W100 million yearsPart of the Ralik Chain, Albian-age fossils have been dredged from this seamount.
Ļōbbadede LobhadodeA chief from Bikini13.88°N 214.6°W94 million yearsDepending on the plate reconstruction model chosen, Lobbadede appears to coincide with the location of the Macdonald hotspot. Limestone and fossils of Campanian-Cenomanian age have been found on Lobbadede, which appears to have had a second volcanic episode in the Cretaceous.
Wōden-Kōpakut RatakA coral head13.94°N 195.8°W85 million years or 82.2 ± 1.6 million yearsPart of the Ratak Chain with Limalok, it was also active during the late Cretaceous and has a well developed summit platform. One reconstruction of plate motion places Woden-Kopakut close to the Rurutu hotspot. Hawaiite has been dredged from the seamount and contains iron oxides, plagioclase and zeolites.
Radik A chief on Ujlan
Ļainjin A legendary navigator11.15°N 164°W
Ļōjemeja A chief in Ujlan11.44°N 166.4°WSteep upper flanks, and a volcanic pinnacle is found between the summit and a sediment-covered terrace.
Ļami According to legend an Eniwetok giant11.91°N 185.6°W86 million yearsSlumps and terraces, terraces that appear to be congruent with these on Lomilik, surround this seamount. Its summit plateau is covered by sediments, sediment-filled basins and volcanic knolls.
Peto-Eņ A taboo channel at Eniwetok12.38°N 180.2°W
A place at Eniwetok with good fishing opportunities11.7°N 198°WThe summit has volcanic knobs and sediment-filled basins in between. The north flank has a terrace and the rest of the slopes is covered with slumps, talus and sediments.
Litōrmālu A legendary navigator10.89°N 188.6°W
Ļo-Wūliej A cape at Eniwetok12.16°N 177.6°W
North Ļāānṃōjānjān Reference to shipbuilding techniques13.13°N 209.2°WHas a rugged appearance with little sediment. It also features several terraces and two large slumps.
South Ļāānṃōjānjān Reference to shipbuilding techniques12.6927°N 199.17°WHas a rugged appearance with little sediment.
Bwewa Kaņ Named after canoe keels13.56°N 189.2°W88 million yearsPart of the Ralik Chain, may have been formed by a hotspot together with a stage of Wodejebato.
Lōjabōn-Bar A strong traditional personage at Bikini13.15°N 194°W
WōdejebatoSylvaniaBikini's most feared sea god11.9325°N 215.72°W 82 million years
Look 12.2°N 179.8°W140 million years Look is the oldest known seamount.Flat-topped seamount that can be considered a guyot and is located between the Ratak Chain and the Ralik Chain, and fairly old. Its geochemistry is intermediate between these two chains as well, which may indicate that volcanism was strongly influenced by the crust. Look Seamount is dotted by volcanic cones and has a rilled appearance as well as slumps; the summit is covered by sediment that mostly buries small volcanic pinnacles and sediment-filled depressions.
Ruwitūn̄tūn̄11.83°N 167°W66 million yearsFlat-topped seamount that can be considered a guyot; basins and volcanic knolls dot its summit platform and some pinnacles contain craters. Fossils indicate that Ruwituntun developed either during or before the Albian.
Ļāwūn-Pikaar BikarLegendary chief in Pikaar12.16°N 219.6°W Ankaramite-like rock containing clinopyroxene and degradation products of olivine and mellilite has been dredged
Ļōkōto-N̄ōrn̄ōr 13.1°N 195.4°W
Jebo 11.05°N 209.6°W
Pali Name given by the government of Micronesia.Probably CretaceousThe seamount is surrounded by a sediment cover and might feature slumps. Hyaloclastite and phosphorite have been dredged from it.
Likelep A site on Ujlan10.6°N 188.8°W82 million yearsBiotite, hornblende and plagioclase have been dredged from Likelep, and the seamount is of Campanian age. Likelep may be part of a seamount trail and is part of the Ujlān volcanic complex. A sediment cap and volcanic structures are found on its top, with a volcanic cone protruding through the sediment. Slumps occur on its flanks and a seamount farther north is connected to Likelep.
Lalibjet A sea god10.14°N 214.2°W74 million yearsMay have been produced by the Rarotonga hotspot together with Eniwetok and is part of the Ujlān volcanic complex. Part of the sediment cap on its summit appears to have been removed by a slump.
Ujlān Ujelang9.78°N 185.2°W80 million yearsSeamount with three separate summits. Ujlan may be part of a seamount trail and is part of the Ujlān volcanic complex. The southwestern flank has a terrace.
Ļōtab A descendant of Litōrmālu10.23°N 203.2°W80 million yearsLotab may be part of a seamount trail and is part of the Ujlān volcanic complex; it also features traces of mass failures and on the northeastern flank it is connected to another seamount.
Ļajutōkwa A navigator10.48°N 206.8°W81 million yearsLajutokwa may be part of a seamount trail and is part of the Ujlān volcanic complex.
HessNamed after the hibiscus tree10.1°N 214.2°W113 million years
Mij-Lep A gap between islands on Ujlan8.81°N 175.6°W106 million yearsA number of pinnacles, including a flat topped one on the summit, cover Mij-Lep.
9.3°N 171°W
Ļewōnjoui 10.5385°N 193.83°W
Ļōkkwōrkwōr Erikub9.15°N 170°W87 million yearsAlkali basalts and hawaiite have been dredged, which contain clinopyroxene, olivine derivatives and plagioclase and show evidence of having been eroded above the water surface
Litakpooki 8.31°N 198.4°W
Ṃaanjidep A chief from Jalwoj6.73°N 188.8°W The depth probably does not refer to the actual summit.
Ļoṃjenaelik A chief from Arno
Ļōmōļkā A chief from Mile6.63°N 193.6°W
HarrieA chiefess from Mile5.6°N 193.6°W68 million years

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