Английская Википедия:East Diamante

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Шаблон:Short description Шаблон:Infobox seamount

East Diamante is a submarine volcano located Шаблон:Convert south of Anatahan in the Northern Mariana Islands of the northwestern Pacific Ocean. It forms part of the Izu–Bonin–Mariana Arc and is hydrothermally active, containing a complex, elongated caldera at its summit.

Geology

East Diamante is one of two submarine volcanoes in the southern Izu–Bonin–Mariana Arc that have erupted felsic magmas, the other being Zealandia Bank.[1] Dacite is the primary rock type and generally has a porphyritic texture, with phenocrysts embedded in a matrix of quartz, plagioclase, clinopyroxene, orthopyroxene and iron-titanium oxides.[2][1] The phenocrysts account for up to 41% of the total rock volume.[1]

The summit of East Diamante lies Шаблон:Convert below sea level and is truncated by an elongated, northeast–southwest-trending caldera. Formation of the caldera was followed by the emplacement of a central dome complex and the construction of a volcanic cone on the southwest caldera rim. The central dome complex displays hydrothermal activity, including black smokers.[2]

Argon–argon dating of dacite from inside the caldera has given an age of 20,000 ± 4000 years, indicating that the volcano was active in the Late Pleistocene.[3] Volcanism continued into the Holocene, but the age of the last eruption is unknown.[2]

See also

References

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  1. 1,0 1,1 1,2 Шаблон:Cite journal
  2. 2,0 2,1 2,2 Ошибка цитирования Неверный тег <ref>; для сносок GVP не указан текст
  3. Шаблон:Cite journal