長崎県大村湾南岸,長与・時津地域の地質

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  • ナガサキケン オオムラワン ナンガン ナガヨ ジ ツチイキ ノ チシツ
  • Geology of the Nagayo and Togitsu Area along the Southern Coast of the Omura Bay, Nagasaki Prefecture

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In the Nagayo and Togitsu area along the southern coast of the Omura Bay, Nagasaki Prefecture, the Nishisonogi metamorphic rocks and the Paleogene Nagayo group comprise the basement rocks which are intruded by porphyrite, diorite and also covered with neovolcanic rocks which are divided into the Togitsu and Nagasaki volcanic rock complex. The Togitsu volcanic rock complex which is assumed as Neogene in age, consists of Kobasaki formation, Lower basalt, Nagayo rhyolite, Kamashima formation, Quartz hornblende andesite, Middle basalt and breccia, and Upper basalt and breccia. The tuffaceous bed, which occupies the lowest part of the Nagasaki volcanic rock complex, is correlated with the Mogi and Kikitsu plant beds which have been considered as Pliocene in age. A part of the Nagasaki volcanic rock complex changes to propylite by propylitization. Propylite, porphyrite and diorite distribute around the Paleogene sedimentaries in the central part of Nagayo area and are surrounded with the Nagasaki volcanic rock complex. The dominant directions of fracture in the volcanic rocks are WNW, NW, and ENE.

長崎大学教育学部自然科学研究報告. vol.29, p.91-104; 1978

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