Английская Википедия:East Diamante
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
- ↑ 1,0 1,1 1,2 Шаблон:Cite journal
- ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег
<ref>; для сносокGVPне указан текст - ↑ Шаблон:Cite journal
- Английская Википедия
- Volcanoes of the Northern Mariana Islands
- Seamounts of the Pacific Ocean
- Submarine calderas
- Pleistocene volcanoes
- Active volcanoes
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- Википедия
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