1 0 0 0 嶺岡オフィオライトの起源
- 著者
- 佐藤 暢 谷口 英嗣 高橋 直樹 MOHIUDDIN Mia Mohammad 平野 直人 小川 勇二郎
- 出版者
- 公益社団法人 東京地学協会
- 雑誌
- 地學雜誌 (ISSN:0022135X)
- 巻号頁・発行日
- vol.108, no.3, pp.203-215, 1999-06-25
- 参考文献数
- 63
- 被引用文献数
- 1 10
Geological, petrological, and biostratigraphical studies of Mineoka ophiolite and related rocks, Hayama and Mineoka Belts, central Japan, were reviewed, and the origin of ophiolite is summarized as follows. 1) Pelagic to hemipelagic sedimentary rocks occur from late Paleocene to middle Miocene. 2) Basaltic rocks in the Hayama Belt are mostly alkali basalts of hotspot origin, whereas those in the Mineoka Belt are mostly tholeiite of mid-ocean ridge origin. 3) Chemical compositions of gabbros and diorites indicate island arc origin. 4) Peridotites are residues after a medium degree of partial melting. These facts arenot consistent with previous ideas that the ophiolite is island arc or back arc originonly. “It is concluded that ophiolite is part of the Mineoka plate” in the Pacific Ocean side, not in the Philippine Sea as previously proposed. Reconstruction of plate motions of the Mineoka plate is proposed, as it was formed at mid-ocean ridge, was subducted by the Pacific plate, and obducted to the Honshu arc during Miocene age after the eastward motion of the triple junction.
1 0 0 0 OA 嶺岡オフィオライトの起源
- 著者
- 佐藤 暢 谷口 英嗣 高橋 直樹 Mia Mohammad MOHIUDDIN 平野 直人 小川 勇二郎
- 出版者
- Tokyo Geographical Society
- 雑誌
- 地学雑誌 (ISSN:0022135X)
- 巻号頁・発行日
- vol.108, no.3, pp.203-215, 1999-06-25 (Released:2010-10-13)
- 参考文献数
- 65
- 被引用文献数
- 5 10
Geological, petrological, and biostratigraphical studies of Mineoka ophiolite and related rocks, Hayama and Mineoka Belts, central Japan, were reviewed, and the origin of ophiolite is summarized as follows. 1) Pelagic to hemipelagic sedimentary rocks occur from late Paleocene to middle Miocene. 2) Basaltic rocks in the Hayama Belt are mostly alkali basalts of hotspot origin, whereas those in the Mineoka Belt are mostly tholeiite of mid-ocean ridge origin. 3) Chemical compositions of gabbros and diorites indicate island arc origin. 4) Peridotites are residues after a medium degree of partial melting. These facts arenot consistent with previous ideas that the ophiolite is island arc or back arc originonly. “It is concluded that ophiolite is part of the Mineoka plate” in the Pacific Ocean side, not in the Philippine Sea as previously proposed. Reconstruction of plate motions of the Mineoka plate is proposed, as it was formed at mid-ocean ridge, was subducted by the Pacific plate, and obducted to the Honshu arc during Miocene age after the eastward motion of the triple junction.
- 著者
- 平田 大二 山下 浩之 谷口 英嗣 菅 香世子 西川 正 青池 寛 有馬 眞 鈴井 正和
- 出版者
- 特定非営利活動法人日本火山学会
- 雑誌
- 日本火山学会講演予稿集
- 巻号頁・発行日
- vol.1996, no.2, 1996-11-05