Imbricate structure of the Permian Yoshii Group in the Otakeyama area, Okayama Prefecture, southwest Japan

Abstract

The Yoshii Group of the Akiyoshi terrane is distributed over the Otakeyama area, Okayama Prefecture, southwest Japan. The Yoshii Group is composed of siliceous rocks and clastics, comprising chert-clastic sequences. The Yoshii Group is divided into four structural units (Units Ot 1, Ot 2, Ot 3, and Ot 4) in structurally ascending order. Lithological similarities and radiolarian age suggest that these units exhibit almost identical ocean plate stratigraphy. These units are structurally-repeated to form an imbricate structure. This structure was possibly formed by off-scrape accretion at a toe of an accretionary complex. Additionally, a review of previous studies indicates that an imbricate structure is common in the Akiyoshi terrane. The presence of an imbricate structure in the Akiyoshi terrane, Permian accretionary complex, indicates the possibility that a specific horizon of Permian pelagic sequences acted as a décollement zone.

Keywords

accretionary complex / imbricate structure / Permian radiolaria / Yoshii Group / Okayama Prefecture / southwest Japan

References

[1] Choh R (1939). Geology of the Oga area of Kawakami County, Okayama Prefecture and the Oga Thrust. Journal of the Geological Society of Japan, 46: 294–295 (in Japanese)

[2] Ezaki Y, Kuwahara K (1997). Fluctuations in pelagic environments near the Permian–Triassic boundary in the Mino-Tamba terrane, southwest Japan. In: Dickins JM, Yang ZY, Yin HF, Lucas SG, Acharyya SK, eds. Late Palaeozoic and Early Mesozoic Circum-Pacific Events and Their Global Correlation: Cambridge University Press, 134–141

[3] Goto N (1988). Stratigraphy of Permian siliceous-argillaceous rocks and their tectonic relation with coarse-grained clastics in the Taishaku area, Southwest Japan. Journal of the Geological Society of Japan, 94(7): 501–514 (in Japanese)

[4] Ichikawa K (1990). Pre-Cretaceous Terranes of Japan. In: Ichikawa K, Mizutani S, Hara I, Hada S, Yao A, eds. Pre-Cretaceous Terrane of Japan: Publication of IGCP project No.224. Osaka: Pre-Jurassic Evolution of Eastern Asia, 1–11

[5] Ishiga H (1986). Late Carboniferous and Permian radiolarian biostratigraphy of southwest Japan. J Geosci Osaka City Univ, 29: 89–100

[6] Ishiga H (1990). Paleozoic Radiolarians. In: Ichikawa K, Mizutani S, Hara I, Hada S, Yao A, eds. Pre-Cretaceous Terrane of Japan: Publication of IGCP project No.224. Osaka: Pre-Jurassic Evolution of Eastern Asia, 285–295

[7] Ishiga H, Watase H, Naka T (1986). Permian radiolarians from the Nishiki Group in Sangun-Chugoku Belts, Southwest Japan. Earth Sci, 40: 124–136 (Chikyu Kagaku)

[8] Isozaki Y (1997). Permo-Triassic boundary superanoxia and stratified superocean: Records from lost deep sea. Science, 276(5310): 235–238

[9] Isozaki Y, Aoki K, Nakama T, Yanai S (2010). New insight into a subduction-related orogen: A reappraisal of the geotectonic framework and evolution of the Japanese Islands. Gondwana Res, 18(1): 82–105

[10] Kamata Y (2000). Imbricate structure of chert-clastics sequence of the Kuzu Complex in the Shiraiwa area of the Ashio Belt, central Japan. The memoirs of the Geological Society of Japan, 55: 203–221 (in Japanese)

[11] Kametaka M (2006). Geology and radiolarian fossils of the Ganbisan area, Akiyoshi terrane, southwest Japan. Abstracts of Japan Geoscience Union Meeting 2006 CD-ROM

[12] Kanmera K, Sano H, Isozaki Y (1990). Akiyoshi Terrane. In: Ichikawa, K., Mizutani, S., Hara, I., Hada, S., Yao, A., eds. Pre-Cretaceous Terrane of Japan. Publication of IGCP project No.224. Osaka: Pre-Jurassic Evolution of Eastern Asia, 49–62

[13] Kawai M, Takeuchi M (2001). Permian radiolarians from the Omi area in the Hida-gaien Tectonic Zone, central Japan. News of Osaka Micropaleontologists, 12(Special): 23–32 (NOM)

[14] Kimura K (1997). Offscraping, underplating and out-of-sequence thrusting process of an accretionary prism: on-land example from the Mino-Tamba Belt, central Japan. Bulletin of the Geological Survey of Japan, 48: 313–337

[15] Kimura K, Hori R (1993). Offscraping accretion of Jurassic chert-clastic complexes in the Tamba-Mino Belt, central Japan. J Struct Geol, 15(2): 145–161

[16] Kobayashi T, Horikoshi Y, (1937). Geological history of the Kibi Plateau.*. Journal of the Geological Society of Japan, 44(528): 797–821 (in Japanese)

[17] Kuwahara K, Yao A, Yamakita S (1998). Reexamination of Upper Permian radiolarian biostratigraphy. Earth Sci, 52: 391–404 (Chikyu Kagaku)

[18] Matsuda T, Isozaki Y (1991). Well-documented travel history of Mesozoic pelagic chert in Japan: from remote ocean to subduction zone. Tectonics, 10(2): 475–499

[19] Matsuoka A (1984). Togano Group of the Southern Chichibu Terrane in the western part of Kochi Prefecture, southwest Japan. Journal of the Geological Society of Japan, 90(7): 455–477 (in Japanese with English abstract)

[20] Matsuoka A (1992). Jurassic-Early Cretaceous tectonic evolution of the Southern Chichibu terrane, southwest Japan. Palaeogeogr Palaeoclimatol Palaeoecol, 96(1-2): 71–88

[21] Matsuoka A, Aita Y, Munasri, Wakita K, Shen G, Ujiie H, Sashida K, Vishnevskaya V S, Bragin N Y, Cordey F (1996). Mesozoic radiolarians and radiolarian-bearing sequences in the circum-Pacific regions: a report of the symposium-‘Radiolarians and Orogenic Belts’. Isl Arc, 5(2): 203–213

[22] Matsuoka A, Hori R, Kuwahara K, Hiraishi M, Yao A, Ezaki Y (1994). Triassic-Jurassic radiolarian-bearing sequences in the Mino terrane, central Japan. In: Organizing Committee of INTERRAD VII, ed. Guide book for INTERRAD VII field excursion: 19–61

[23] Naka T, Watase H, Tokuoka T (1986). Permian Nishiki Group in the Muikaichi-cho, western part of the Sangun-Chugoku Belt, Shimane Prefecture, southwest Japan. Earth Sci, 40: 166–176 (Chikyu Kagaku)

[24] Nakae S, Ozaki M, Ota M, Yabumoto Y, Matsuura H, Tomita S (1998). Geology of the Kokura Districts, Quadrangle Series, scale 1: 50000, Geological Survey of Japan, 126 (in Japanese)

[25] Nakano M (1952). Geology of the Kyowa area, Shitsuki County, Okayama Prefecture: new evidences of Paleozoic-Mesozoic.*. Journal of the Geological Society of Japan, 58: 288–289 (in Japanese)

[26] Otoh S (1985). Unconformity between non-metamorphic Paleozoic strata and the Upper Triassic Nariwa Group in the Oga area, Okayama Prefecture. Journal of the Geological Society of Japan, 91(11): 779–786 (in Japanese)

[27] Otsuka T (1988). Paleozoic-Mesozoic sedimentary complex in the eastern Mino terrane, central Japan, and its Jurassic tectonism. J Geosci Osaka City Univ, 31: 63–112

[28] Sada K, Oho Y, Inoue M, Koike T, Okada D, Kaneko K (1985). A discovery of the microfossil faunas from the Otake Formation in Okayama Prefecture, western Japan. Proceedings of Japan Academy, Series B, 61(5): 197–199

[29] Sada K, Takata Y, Oho Y (1992). Radiolarian faunas discovered from the Yoshii Group in Okayama Prefecture, western Japan. In: Ishizaki, K., Saito, T., eds. Centenary of Japanese Micropaleontology: Terra Scientific Publishing Company, Tokyo, 383–387

[30] Sadagane S, Nose S (1981). Developments of geoscience teaching materials: Geology around Yoshii Town in Shitsuki County.*. Bulletin of Okayama Prefectural Education Center, 71: 1–25 (in Japanese)

[31] Sano H (1988). Permian oceanic-rocks of Mino terrane, central Japan Part I. chert facies. Journal of the Geological Society of Japan, 94(9): 697–709

[32] Sano H, Iijima Y, Hattori H (1987). Stratigraphy of the Paleozoic rocks in the Akiyoshi Terrane of the central Chugoku Massif. Journal of the Geological Society of Japan, 93(12): 865–880 (in Japanese)

[33] Sano H, Kanmera K (1988). Paleogeographic reconstruction of accreted oceanic rocks, Akiyoshi, southwest Japan. Geology, 16(7): 600–603

[34] Sugiyama K (1992). Lower and Middle Triassic radiolarians from Mt. Kinkazan, Gifu Prefecture, central Japan. Transactions and Proceedings of the Palaeontological Society of Japan, New series, 167: 1180–1223

[35] Tazawa J, Niikawa I, Ibaraki Y, Hasegawa Y (2002). The Omi Limestone and some Paleozoic and Mesozoic formations in the Omi area, central Japan. 109th Annual Meeting of the Geological Society of Japan, Excursion Guidebook, 25–39 (in Japanese)

[36] Teraoka Y, Matsuura H, Matsumoto H, Yoshida S, Kamiya M, Hiroshima T, Komazawa M, Shichi R (1996). Geological Map of Japan 1:200,000, Takahashi. Tsukuba: Geological Survey of Japan, AIST (in Japanese)

[37] Uchiyama T, Sano H, Kanmera K (1986). Depositional and tectonic settings of Cherts around the Akiyoshi limestone Group, Southwest Japan. Memoire of Faculty of Science, Kyushu University, Series D. Geology, 16: 51–68

[38] Wang Y J, Yang Q (2011). Biostratigraphy, phylogeny and paleobiogeography of Carboniferous-Permian radiolarians in South China. Palaeoworld, 20(2-3): 134–145

[39] Yanase A, Isozaki Y (1993). Lithostratigraphy and radiolarian age of Permian accretionary complex in Kiku Peninsula, Northern Kyushu. Journal of the Geological Society of Japan, 99(4): 285–288 (in Japanese)

[40] Yao A, Matsuda T, Isozaki Y (1980). Triassic and Jurassic radiolarians from the Inuyama area, central Japan. J Geosci Osaka City Univ, 23: 135–155

[41] Yoshimura N (1961). Geological Studies of the Paleozoic Groups in the Oga Plateau, Central Chugoku, Japan. Geological Report of the Hiroshima University, 10: 1–36 (in Japanese)

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg