Английская Википедия:Erimo Seamount
Шаблон:Short description Шаблон:Infobox seamount
Erimo Seamount (also known as Sisoev SeamountШаблон:Sfn) is a seamount off Hokkaido, Japan. Located close to the intersection between the Kuril-Kamchatka and Japan Trenches, it is in the process of being subducted. The Cretaceous seamount formed 100-120 million years ago and is covered by a limestone cap. Tiltmeters have been installed on its top.Шаблон:Sfn
Geography and geomorphology
Regional
Erimo Seamount lies southeast of Cape Erimo of Hokkaido, Japan. The seamount lies close to the intersection between the Kuril–Kamchatka Trench to the northeast and the Japan Trench to the south,Шаблон:SfnШаблон:Sfn and is sometimes used to define the boundary.[1] Erimo Seamount lies Шаблон:Convert oceanwardШаблон:Sfn and south and east from the trenchesШаблон:Sfn and it forms the northern tip of the Japan Trench; there the Pacific Plate subducts at a rate of Шаблон:Convert, together with the seamounts on itШаблон:Sfn such as Erimo which is currently entering the trench.[2] Other seamounts in the area are Takuyo-Daiichi to the east-northeast and Ryofu-Daini to the east-southeast,Шаблон:Sfn and there is evidence of another seamount northwest of Erimo and in the process of being subducted.Шаблон:Sfn Unlike other seamounts, Erimo is not part of a seamount chain.[3] Possibly, as such a seamount or a seamount chain subducted it indented the trenches, forming a Шаблон:Convert re-entrant.Шаблон:Sfn
Local
The seamount is a guyotШаблон:Sfn which rises about Шаблон:ConvertШаблон:Sfn to a depth of Шаблон:Convert,[1] where a flat top is covered by early Cretaceous limestoneШаблон:Sfn that contains gastropods,[4] green algae and red algae from that time.Шаблон:Sfn Erimo Seamount is cut by normal faults that run parallel to the Kuril-Kamchatka Trench,[2] and the seamount is tilting[5] and beginning to break apart as its subduction starts.[6] It has a volume of about Шаблон:Convert, making it a mid-sized seamount by Pacific Ocean seamount standards, with a northeast-southwest elongated shape and a maximum width of Шаблон:ConvertШаблон:Sfn and recognizable rift zones.Шаблон:Sfn The crust underneath Erimo contains the magnetic anomaly M8Шаблон:Sfn and has an age of about 120 million years.Шаблон:Sfn
Volcanic rocks dredged from Erimo Seamount include alkali basalt,Шаблон:Sfn brecciated basalts, silty sandstone,Шаблон:Sfn trachyandesites or trachytes.Шаблон:Sfn During the Cretaceous, carbonate rocks were emplaced at shallow depth on the seamount, which subsided by about Шаблон:Convert. As the seamount has entered the trench, further subsidence of about Шаблон:Convert has taken place.Шаблон:Sfn
Age
Erimo Seamount formed in the Cretaceous in an off-ridge settingШаблон:Sfn but close to a spreading center;Шаблон:Sfn it is about 100-120 million years old,Шаблон:Sfn while potassium-argon dating has yielded an age of 80 million yearsШаблон:Sfn and argon-argon dating of 104 ± 9 million years.Шаблон:Sfn Cretaceous volcanic activity has generated seamounts all across the Western Pacific Ocean,Шаблон:Sfn but Erimo today is inactive.[5] This seamount appears to be part of a large hotspot-generated seamount province whose youngest activity is currently located in French Polynesia.[7]
References
Sources
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
<ref>; для сносокJamiesonStewart2021не указан текст - ↑ 2,0 2,1 Ошибка цитирования Неверный тег
<ref>; для сносокLallemand1990не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокGeersenSippl2022не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокChaseLarson1972не указан текст - ↑ 5,0 5,1 Ошибка цитирования Неверный тег
<ref>; для сносокGeorge1985не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокLallemand1989не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокMiyazaki2015не указан текст
