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Survey Dept. Sri Lanka, Sp. Pub. IGCP236,26,1987; KRONER et al. : J. Geol., 95,775,1987; MILISENDA et al. : J. Geol., 96,608,1988) indicate that there are fundamental differences in the ages of original rocks between the Highland Group and the Vijayan Complex. The comparative structural study of the Sri Lankan Precambrian rocks, therefore, is now an urgent necessity. Based on the structural data from southwest, central and southeast Sri Lanka, the following results have been obtained :i) Rocks of the Highland and Southwest Groups suffered rootless-isoclinal folds (D_1), overturned-recumbent folds (D_2), upright folds (D_3), and ductile fault and gentle folds (D_4). ii) D_1 structures are well developed as small folds throughout gneisses and charnockites of both Highland and Southwest Groups. 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GEOLOGIC STRUCTURES OF PRECAMBRIAN ROCKS OF SRI LANKA : FOR THE BASIS OF COMPARATIVE STUDIES WITH ANTARCTICA
https://doi.org/10.15094/00002606
https://doi.org/10.15094/000026069872048d-033a-4361-9b29-5344d7b31fc8
名前 / ファイル | ライセンス | アクション |
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KJ00002368186 (64.2 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-09-01 | |||||
タイトル | ||||||
タイトル | GEOLOGIC STRUCTURES OF PRECAMBRIAN ROCKS OF SRI LANKA : FOR THE BASIS OF COMPARATIVE STUDIES WITH ANTARCTICA | |||||
言語 | ||||||
言語 | eng | |||||
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 | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002606 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
論文名よみ | ||||||
その他のタイトル | GEOLOGIC STRUCTURES OF PRECAMBRIAN ROCKS OF SRI LANKA : FOR THE BASIS OF COMPARATIVE STUDIES WITH ANTARCTICA | |||||
著者名よみ |
ヨシダ, マサル
× ヨシダ, マサル |
|||||
著者名(英) |
YOSHIDA, Masaru
× YOSHIDA, Masaru |
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著者所属(英) | ||||||
en | ||||||
Department of Geosciences, Faculty of Science, Osaka City University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Recent geochronological studies (GERMAN-SRI LANKAN CONSORTIUM : Geol. Survey Dept. Sri Lanka, Sp. Pub. IGCP236,26,1987; KRONER et al. : J. Geol., 95,775,1987; MILISENDA et al. : J. Geol., 96,608,1988) indicate that there are fundamental differences in the ages of original rocks between the Highland Group and the Vijayan Complex. The comparative structural study of the Sri Lankan Precambrian rocks, therefore, is now an urgent necessity. Based on the structural data from southwest, central and southeast Sri Lanka, the following results have been obtained :i) Rocks of the Highland and Southwest Groups suffered rootless-isoclinal folds (D_1), overturned-recumbent folds (D_2), upright folds (D_3), and ductile fault and gentle folds (D_4). ii) D_1 structures are well developed as small folds throughout gneisses and charnockites of both Highland and Southwest Groups. Fold hinges generally plunge NNW or SSE, paralleling the major structures, but sometimes distinctly inclined from them.iii) D_2 and D_3 structures are major fold structures throughout the study areas with their hinges generally trending NNW-SSE. Most of lineations are parallel to hinges of the major folds. Axial plane schistosity is generally associated with D_3 structures. iv) Rocks of the Highland and Southwest Groups have similar structural characteristics and structural histories.v) Rocks in arenas (doubly plunging synforms) in the area around Kandy have similar structural histories to the Highland Group rocks outside the arenas regarding D_3 and D_4 structures; D_3 structures of rocks in arenas, however, are upright tight-isoclinal folds, and related lineations are steep and are inclined from hinges of the major structures. vi) Pre-D_3 structures of rocks in the arenas are the earlier isoclinal and rootless folds with their hinges discordant to the major structures and later veinings discordant from the original s-surfaces. They all differ from D_1-D_2 structures of rocks outside the arenas. vii) Rocks of the East Vijayan Complex have common structures with those of the Highland Group rocks regarding D_3 and D_4 structures. Pre-D_3 structures are complex and need to be studied in more detail. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 3, p. 153, 発行日 1989-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |