Mendeley出力
＜紀要論文＞
徳島県那賀川上流の秩父帯北帯の古生層
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| 概要 | This paper describes the stratigraphy and lithologic features of the Upper Paleozoic Sawadani Group in the upper reaches of the Nakagawa, eastern Shikoku, which occupies the northern part of the Chich...ibu Belt. The stratigraphic sequence of the Sawadani Group is shown in Fig. 1 and is summarized .as follows in ascending order: Lower unit: Thick-bedded medium-grained feldspathic arenite with intercalated thin beds of shale Middle unit: a) lower part-mainly mudstone (converted to slate) with several beds of basaltic tuff and associated chert b) middle part-mostly doleritic to basaltic lava and coarse-grained tuff-breccia c) upper part-basaltic tuff, sometimes calcareous, with shale (slate or phyllite) in the middle portion and limestone in the upper unconformity Upper unit: mainly mudstone (slate) with some beds of basaltic tuff and accompanied chert in the lower part and lenticular beds of fine-grained lithic wacke in the upper. On fossil evidence the middle unit is referred to upper Upper Carboniferous (Triticites zone) to Lower Permian (Pseudoschwagerina zone), and the upper unit to upper Middle Permian (Yabeina globosa zone). Thus the most remarkable volcanic series of the Sawadani Group are of early Permian ages. Thick piles of geosynclinal volcanic matter were deposited in the northern part of the Chichibu Belt of Southwest Japan in latest Carboniferous to early Permian ages. Fig. 4 shows their representative distribution in Shikoku and Kyushu. Preliminary remarks are given on the correlation of the Sawadani Group with the Mikabu Green Rocks and the Sambagawa metamorphic rocks which lies directly to the north.続きを見る |
詳細
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| 登録日 | 2021.11.24 |
| 更新日 | 2022.06.20 |