ファイル情報(添付) | |
タイトル |
丹波帯にみられるトリアス紀古世~中世層状チャートとP/T境界の黒色有機質泥岩
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タイトル |
Late Early to early Middle Triassic bedded cherts in the Tanba Belt and black organic mudstones in the P/T boundary, Southwest Japan
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タイトル 読み |
タンバタイ ニ ミラレル トリアスキ コセイ チュウセイ ソウジョウ チャート ト P T キョウカイ ノ コクショク ユウキシツ デイガン
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著者 |
山下 雅之
石田 耕太郎
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収録物名 |
島根大学地質学研究報告
Geological reports of Shimane University
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巻 | 11 |
開始ページ | 87 |
終了ページ | 96 |
収録物識別子 |
ISSN 0287816X
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内容記述 |
抄録・要旨
Lithologic characteristics, biostratigraphy and geochemical analysis of the late Early to early Middle Triassic bedded cherts were described from the two locations, Ashimi section in Type I (T I) suite and Taki section in Type II (T II) suite of the Tanba Belt, Southwest Japan, and the sedimentary environments of siliceous rocks in eath suite is evaluated.
Bedded cherts in Ashimi section are composed of altemating beds of black to dark gray siliceous parts and dark gray to yellowish gray clay parts, and characteristically contain intercalated organic black mudstones. In two horizons in this section yielded the Spathian to Anisian conodont, Neopathodus homeri (Bender) . In contrast, bedded cherts in the Taki section producing the late Spathian radiolarians, Parontactinia sp. characteristically occurred from red cherts and shale partings. Moreover, some of the late Early to early Middle Triassic bedded cherts in T II unit also indicate the same color variation. Lithologic feature described above suggests that the paleo-oceanic basins under the varied sedimentary environments (ex. oxic/anoxic environments) had occurred in the late Early to early Middle Triassic, and T I and T II units are representative of mutually different paleo-oceanic basins. This indicates that an anoxic sedimentary environment throughout P/T boundary had changed to oxic environment in oceanic basin of T II unit at the earlier stage than that of T I unit. |
言語 |
日本語
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資源タイプ | 紀要論文 |
出版者 |
島根大学理学部地質学教室
Department of Geology, Faculty of Science, Shimane University
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発行日 | 1992-07-30 |
出版タイプ | Version of Record(出版社版。早期公開を含む) |
アクセス権 | オープンアクセス |
関連情報 |
[NCID] AN00054980
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備考 | 1-11 / 1982-1992 |