ID | 49208 |
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Sort Key | 4
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Title Alternative | Folded structure of the Carboniferous Ko-yama Limestone Group, Akiyoshi Belt, SW JAPAN
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FullText URL | |
Author |
Inada, Noriyuki
Ishida, Keisuke
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Abstract | The fold structure of the Akiyoshi Belt was analyzed in Kawakami-cho, Okayama Prefecture, where the Lower
Carboniferous to Middle Permian Ko-yama Limestone Group (Yokoyama et al., 1979), Permian Yoshii Group
(Sano et al., 1987) and Triassic Nariwa Group (Teraoka, 1959) are distributed. The Nariwa Group unconformably
covers the Paleozoic successions (Otoh, 1985). The Lower Carboniferous to Middle Permian Ko-yama Limestone
Group, dated by foraminifers and fusulinids (Yokoyama et al., 1979), is mainly composed of massive limestone
with basic volcanics, acidic tuff and chert. The Paleozoic successions of the Akiyoshi Belt were folded during the
Middle to Late Permian (Suzuki et al., 1990). Strata of the Ko-yama Limestone Group generally strike E-W and
dip to the north. The Hoya section about 300 m thick is composed of limestone, basic tuff, chert and acidic tuff,
limestone, basic lava and tuff in ascending order. In this section, Ishida et al. (2012) recognized a nearly complete
conodont faunal succession ranging from the upper Visean to the lower Moscovian. The faunal succession
indicates younging southward, and the strata are overturned. A folded strucuture of tight overfold with
north-dipping axial plane was reconstructed. Similar style of small scale overfolds of banded chert and turbidite
were observed in the overlying Yoshii Group.
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Keywords | folded structure
Ko-yama Limestone Group
Carboniferous
Akiyoshi Belt
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Publication Title |
Okayama University Earth Science Report
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Published Date | 2012-12-26
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Volume | volume19
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Issue | issue1
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Publisher | 岡山大学理学部地球科学教室
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Publisher Alternative | Department of Earth Sciences, Faculty of Science, Okayama University
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Start Page | 5
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End Page | 11
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ISSN | 1340-7414
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NCID | AN10506284
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Content Type |
Departmental Bulletin Paper
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OAI-PMH Set |
岡山大学
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language |
Japanese
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Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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File Version | publisher
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Refereed |
False
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NAID | |
Eprints Journal Name | esr
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