54. 海野　進・中野　俊，2007. 父島列島地域の地質． 地域地質研究報告（5万分の1地質図幅）小笠原諸島(20) No. 2 NG-54-8-13·14. 産業技術総合研究所地質調査総合センター，71p.

The Izu-Ogasawara (Bonin) Arc has an extension of 1,500 km in length and 400 km in width, consisting of the Shichito Ridge, Backarc-Nishinoshima Trough, Ogasawara (Bonin) Trough and Ridge, and Japan Trench from west to east. The Ogasawara (Bonin) Island Group, comprising Mukojima Rettō, Chichijima Rettō and Hahajima Rettō from north to south, lies between latitude 26°32’N and 27°44’N and at longitude 142°E on the shallow shelf on the Ogasawara Ridge. The Shichito Ridge is a post Oligocene volcanic ridge capped by the Quaternary volcanoes including Nishi-no Shima and the Volcano Islands. The Geological Map “Chichijima Rettō” covers Chichijima Island Group situated between latitude 27°02’N and 27°12’N and between longitude 142°03’N and 142°15’N and Nishi-no Shima between latitude 27°13.5’N and 27°16’N and between longitude 140°52’N and 140°54’N. The Chichijima Rettō (Islands) are comprised mainly of Tertiary (Eocene) volcanic strata and the Nishi-no Shima (Island) is a late Quaternary volcanic island.

Keyword: Izu–Bonin–Mariana arc, Chichijima, geological map, subduction initiation, forearc stratigraphy, 40Ar/39Ar age
キーワード: 伊豆－小笠原－マリアナ弧，父島，沈み込み帯発生，前弧層序，40Ar/39Ar年代，5万分の1地質図幅，産総研，地質調査総合センター