<国立科博専報>対馬下島, 対州鉱山付近の地質について

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概要

• 論文の詳細を見る

• The sedimentary rocks which constitute the Tsushima Shimo-shima Island, belong to the Lower and Middle Formations of the Taishu Group, probably of the early Tertiary. The Lower Formation, at least 1,600 m thick, consists of gray fine- to medium-grained sandstone, black massive siltstone and shale, and is intruded by eight or more sills and sheets of quartz-porphyry. The Middle Formation, at least 900 m thick, consists of black massive siltstone and shale accompanying thin layers of fine-grained sandstone and three or four intrusive sills and dykes of quartz-porphyry. It seems that the Lower Formation was deposited in the deltaic front whereas the Middle Formation was deposited on the open shelf. The structural framework of this area is composed of the Wakata synclinolium and two anticlinolium; namely, Izuhara-Kamisaka anticlinolium, situated in the eastern part of Shimo-shima Island, and the Komoda anticlinolium, located in the western part.

• 国立科学博物館の論文

著者

• 松橋 秀郎/桐生

  /東邦亜鉛株式会社 対州鉱業所 地質調査室

• 松橋 秀郎/桐生

  /////東邦亜鉛株式会社, 対州鉱業所, 地質調査室

• 黒沼 長助

  東邦亜鉛株式会社, 対州鉱業所, 地質調査室

関連論文

• 対馬下島, 対州鉱山付近の地質について

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