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The Kazan Island Group is located on the Shichito-Iwoto Ridge, the present volcanic front of the Izu-Ogasawara Arc, and consists of three islands from north to south: Kita Iwoto, Iwoto, and Minami Iwoto. Kita Iwoto is the summit of a massive submarine volcano rising from a depth of about 1,500 to 2,000 m, with advanced dissected quaternary volcano. Basaltic rocks are distributed on both Kita Iwoto and Minami Iwoto, and there are no records of volcanic activity on either island. (Ref. 1) Iwoto has a caldera topography 10 km in diameter and is characterized by producing high alkaline andesitic rocks. (Ref. 2)
Ref. 1: Nakano Shun, Furukawa Ryuta, “Outline of geology of Kita-Iwo-To Volcano in Volcano Islands, Japan,” Geological Survey Report, Vol. 60, 2009, pp. 395-405.
Ref. 2: Oyagi Norio, Inokuchi Takashi, “2.3 Geology of Iwo Jima,” Journal of Geography, Vol. 94, 1985, pp. 436-445.
Related documents
Tsuya Hiromichi, Geology and Petrography of Io-sima (Sulphur Island), Volcano Islands Group, Bulletin of the Earthquake Research Institute, Tokyo Imperial University. 14, 1936, pp. 453-480.
Kaizuka Sohei, Kato Shigeru, Nagaoka Shinji, Miyauchi Takahiro, “2.2. Geomorphology of Iwo-jima and Surrounding Sea Floor,” Journal of Geography, Vol. 94, 1985, pp. 424-444.
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