書誌事項
- タイトル別名
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- Characteristics of tufas developed in the western Tokuno-shima, southern Japan.
- トクノシマ セイブ ニ ハッタツ スル トゥファ ノ トクチョウ
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Tufas of southwestern Tokuno-shima Island in subtropical Ryukyus reveal some chemical and depositional characteristics which differ from those of previously-described tufa deposits from temperate regions in Japan. Warm climate reflects high soil Pco2 and the resultant high Ca contents of the ground water, and also rises water temperature of the stream water. All these conditions cause high inorganic precipitation rate of calcite. The rate evaluated by using the water chemistry data is nearly twice larger than the values recorded in the temperate regions. This is consistent to the observed large growth rate of tufa, up to 2.3cm/year. The largest evaluatedprecipitation rate was recorded in CO2-degassed water of a pool where the shrublike deposits are developed. The tufas of Tokuno-shima often exhibit laminated textures, but the lamination pattern is irregular and cannot be regarded as an annual banding. Probably some processes, as well as seasonal variation in climatic conditions, are related to banding of tufa deposits. The tufas of Tokuno-shima are various in terms of internal textures and associated cyanobacteria. However, these variations may be ascribed to variations in hydrology and associated biota due to the collecting locations, rather than the subtropical climatic conditions.
収録刊行物
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- 地質学雑誌
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地質学雑誌 108 (3), 153-163, 2002
一般社団法人 日本地質学会
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詳細情報 詳細情報について
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- CRID
- 1390001206234919680
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- NII論文ID
- 110003013208
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- NII書誌ID
- AN00141768
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- COI
- 1:CAS:528:DC%2BD38XktVWrsLk%3D
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- ISSN
- 13499963
- 00167630
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- NDL書誌ID
- 6119293
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可