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Ioah Guyot is a seamount in the Pacific Ocean, close to the Marshall Islands. [2] 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 .
The Magellan Seamounts extend from to . They include: Govorov Guyot [7. 7]; 121 ± 2.8 to 98.5 ± 1.4 Ma [7]; Ioah Seamount (also known as Ioah Guyot, Ioan Seamount or Fedorov Seamount) . 8]; 87 million years old [8]; Pako Guyot. 9]; 92 million years old [9] but volcanics have been now dated in range 112 to 86 Ma and < 20 Ma in smaller volcanoes on the guyot. [10]; Vlinder Guyot (also known as ...
As the volcano sinks and erodes, it first becomes an atoll island and then an atoll. Further subsidence causes the volcano to sink below the sea surface, becoming a seamount. Once a seamount is 600 m (2,000 ft) or more under the surface, it is also classed as a guyot.
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These volcanoes form several groups, including the Ralik Chain, the Ratak Chain and some seamounts around Anewetak. [1] 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.
The Bear Seamount (left), a guyot in the northern Atlantic Ocean. In marine geology, a guyot (/ ˈ ɡ iː. oʊ, ɡ iː ˈ oʊ /), [1] [2] also called a tablemount, is an isolated underwater volcanic mountain with a flat top more than 200 m (660 ft) below the surface of the sea. [3] The diameters of these flat summits can exceed 10 km (6 mi). [3]
Nintoku Seamount or Nintoku Guyot is a seamount (underwater volcano) and guyot (flat top) in the Hawaiian-Emperor seamount chain. It is a large, irregularly shaped volcano that last erupted 66 million years ago. Three lava flows have been sampled at Nintoku Seamount; the flows are almost all alkalic (subaerial) lava. [4] It is 56.2 million ...
The guyot is part of the Magellan Seamounts. [8] The seamount was volcanically active during the Cretaceous-Paleogene [9] 91.3 million years ago [10] and may have formed on a hotspot together with Ioah Guyot and Vlinder Guyot; [11] a late phase of volcanism may have taken place in the Paleocene-Eocene. [12]