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Miyakojima is located in the southern part of the Ryukyu Islands, about 300 km southwest of Okinawajima, and 400 km east of Taiwan. Miyakojima is a right-triangle in outline with its hypotenuse along the northeastern coast. The highest point of Miyakojima, which is 115 m above sea-level, is in one of the NW-trending asymmetrical ridges. Major stratigraphic divisions in Miyakojima are the Pliocene Shimajiri Group, Pleistocene Ryukyu Group, and Recent coastal and lowland deposits. The Shimajiri Group crops out chiefly along the northeastern coast of Miyakojima. It strikes generally NE and dips gently SE. The Shimajiri Group comprises, in ascending order, the Oura, Onogoshi, Yonahama, and Minebari Formations which consist mostly of sandstone, mudstone, tuffaceous siltstone, and an alternation of sandstone and siltstone, respectively. The molluscan and solitary coral fossils and lithofacies indicate increase of water depth during deposition of the Shimajiri Group. In biostra-tigraphy, the highest horizon of occurrence of Globigerina nepenthes Todd and the lowest horizon of Globorotalia tosaensis Takayanagi and Saito (planktonic formainifera), and the lowest horizon of Discoaster asymmetricus Gartner, the highest horizons of Reticulofenestra pseudoumbilica (Gartner) Gartner, Sphenolithus spp. and Discoaster tamalis Kamptner (calcareous nannoplankton) are useful for age determination of the Shimajiri Group. Lithology of the Ryukyu Group is limestone composed of calcareous organic materials and their detritus. It overlies the Shimajiri Group unconformably and occurs in most part of Miyakojima and the adjacent islands. The Ryukyu Group comprises the Miyakojima Limestone and Shimojijima Limestone which overlies the former with unconformity. On the basis of fossils contained, the limestone of the Ryukyu Group is classified principally into four types : coral limestone which contains autochtonous corals, algal ball limestone containing algal balls or rhodolites, detrital limestone which consists of detritus of calcareous organic remains, and larger foraminiferal limestone composed of larger foraminifera Cycloclypeus and Operculina. Three sedimentary cycles, each of which begins from larger foraminiferal limestone or detrital lime-stone, and ends in coral limestone, are recognized in the Miyakojima Limestone, and are named the lower, middle and upper parts. Stratigraphy of the Ryukyu Group in Miyakojima and the adjacent islands is summarized in Table 1. 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Minor en echelon faults along the ridges were resulted from variety of throw or slumping along the major faults.", "subitem_description_type": "Abstract"}]}, "item_4_description_41": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"subitem_description": "紀要類(bulletin)", "subitem_description_type": "Other"}]}, "item_4_description_66": {"attribute_name": "フォーマット", "attribute_value_mlt": [{"subitem_description": "1847820 bytes", "subitem_description_type": "Other"}]}, "item_4_description_81": {"attribute_name": "dc.description.provenance", "attribute_value_mlt": [{"subitem_description": "Made available in DSpace on 2008-05-02T06:22:58Z (GMT). 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琉球列島 宮古群島の地質
http://hdl.handle.net/10097/33204
http://hdl.handle.net/10097/33204b1f424ed-a1f0-4897-b755-4568196e54e9
名前 / ファイル | ライセンス | アクション |
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KJ00004208334.pdf (1.8 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-02 | |||||
タイトル | ||||||
タイトル | 琉球列島 宮古群島の地質 | |||||
言語 | ||||||
言語 | jpn | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
中森, 亨
× 中森, 亨 |
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著者(ヨミ) | ||||||
姓名 | Nakamori, Toru | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | This article deals with geology and depositional history of the Pleistocene coral limestones of Miyakojima and the adjacent islands. Miyakojima is located in the southern part of the Ryukyu Islands, about 300 km southwest of Okinawajima, and 400 km east of Taiwan. Miyakojima is a right-triangle in outline with its hypotenuse along the northeastern coast. The highest point of Miyakojima, which is 115 m above sea-level, is in one of the NW-trending asymmetrical ridges. Major stratigraphic divisions in Miyakojima are the Pliocene Shimajiri Group, Pleistocene Ryukyu Group, and Recent coastal and lowland deposits. The Shimajiri Group crops out chiefly along the northeastern coast of Miyakojima. It strikes generally NE and dips gently SE. The Shimajiri Group comprises, in ascending order, the Oura, Onogoshi, Yonahama, and Minebari Formations which consist mostly of sandstone, mudstone, tuffaceous siltstone, and an alternation of sandstone and siltstone, respectively. The molluscan and solitary coral fossils and lithofacies indicate increase of water depth during deposition of the Shimajiri Group. In biostra-tigraphy, the highest horizon of occurrence of Globigerina nepenthes Todd and the lowest horizon of Globorotalia tosaensis Takayanagi and Saito (planktonic formainifera), and the lowest horizon of Discoaster asymmetricus Gartner, the highest horizons of Reticulofenestra pseudoumbilica (Gartner) Gartner, Sphenolithus spp. and Discoaster tamalis Kamptner (calcareous nannoplankton) are useful for age determination of the Shimajiri Group. Lithology of the Ryukyu Group is limestone composed of calcareous organic materials and their detritus. It overlies the Shimajiri Group unconformably and occurs in most part of Miyakojima and the adjacent islands. The Ryukyu Group comprises the Miyakojima Limestone and Shimojijima Limestone which overlies the former with unconformity. On the basis of fossils contained, the limestone of the Ryukyu Group is classified principally into four types : coral limestone which contains autochtonous corals, algal ball limestone containing algal balls or rhodolites, detrital limestone which consists of detritus of calcareous organic remains, and larger foraminiferal limestone composed of larger foraminifera Cycloclypeus and Operculina. Three sedimentary cycles, each of which begins from larger foraminiferal limestone or detrital lime-stone, and ends in coral limestone, are recognized in the Miyakojima Limestone, and are named the lower, middle and upper parts. Stratigraphy of the Ryukyu Group in Miyakojima and the adjacent islands is summarized in Table 1. The comparison of lithofacies and their distribution between the Recent coral reefs around the islands and limestone of the Ryukyu Group indicates a reef ridge in the southern part of Miyakojima and a back reef region in the northeastern part during deposition of the lower part of Miyakojima Limestone, and migration of the coral reefs to the northern part of Miyakojima during deposition of the middle part. The coastal and lowland deposits include Recent coral reefs, coastal dune, beach deposits, and residual clay. Their distribution is closely related to the topography. The rows of ridges on the limestone, which are remarkable topography in Miyakojima, were constructed by normal faults and subsequent weathering around them. Minor en echelon faults along the ridges were resulted from variety of throw or slumping along the major faults. | |||||
書誌情報 |
東北大學理學部地質學古生物學教室研究邦文報告 巻 84, p. 23-39, 発行日 1982-03-29 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00824658 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00171452 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
その他の言語のタイトル | ||||||
その他のタイトル | Geology of Miyako Gunto, Ryukyu Islands, Japan | |||||
出版者 | ||||||
出版者 | 東北大學 | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | 紀要類(bulletin) | |||||
登録日 | ||||||
日付 | 2008-05-02 | |||||
日付タイプ | Created | |||||
公開日(投稿完了日) | ||||||
日付 | 2008-05-02 | |||||
日付タイプ | Created | |||||
発行日 | ||||||
日付 | 1982-03-29 | |||||
日付タイプ | Created | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | 1847820 bytes | |||||
公開範囲 | ||||||
値 | 学外 | |||||
更新日 | ||||||
日付 | 2010-01-27 | |||||
日付タイプ | Created |