Jour. Geol. Soc. Japan, Vol. 124, No. 2, p , February 2018 doi: /geosoc Devonian chert in the Permian Ko
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1 Jour. Geol. Soc. Japan, Vol. 124, No. 2, p , February 2018 doi: /geosoc Devonian chert in the Permian Kozuki Formation of the Ultra-Tamba Zone, eastern Okayama Prefecture, Southwest Japan Abstract Shizuo Takemura, Atsushi Takemura, Hikaru Ueno, Yoshiaki Sugamori and Hiroshi Furutani Geoscience Institute, Hyogo University of Teacher Education, Hyogo , Japan / Department of Regional Environment, Faculty of Regional Sciences/ Department of Agricultural, life and Environmental Sciences, Faculty of Agriculture, Tottori University, Tottori , Japan Institute of Natural and Environmental Sciences, University of Hyogo, Sanda, Hyogo , Japan : Present address: Muko Elementary School, Sanda, Hyogo , Japan Devonian chert beds in the Permian Kozuki Formation of the Ultra-Tamba Zone are reported from Mimasaka City, Okayama Prefecture, Southwest Japan. The Kozuki Formation consists mainly of Permian clastic rocks and felsic tuffs with basalts, Carboniferous limestone, and Early Permian cherts, and is therefore interpreted as a Permian accretionary complex similar to the other formations of the Ultra-Tamba Zone. The Devonian chert beds are frequently intercalated with black layers composed of magnetite, in which a wellpreserved radiolarian fauna occurs. These magnetite beds with radiolarian shells indicate the sedimentary origin derived from hydrothermal activity on the seafloor. The radiolarian fauna contains Holoeciscus foremanae and H. elongatus, as well as Ceratoikiscum avimexpectans and Archocyrtium sp., indicating the Fammenian Age of Late Devonian. These are the oldest fossils in the Chugoku District and the chert beds represent one of the oldest allochthons within the accretionary complexes of Japan, similar in age to the Devonian chert of the Nedamo Belt in the Tohoku District. Keywords: Devonian radiolarians, Kozuki Formation, Ultra-Tamba Zone, chert, magnetite, Okayama Prefecture Corresponding author: S. Takemura, takesizu@hyogo-u.ac.jp Caridroit et al.1985 Ishiga1986 Fig. 1, 1993Kojima et al., 2000, Ishiga, 1986 Cisuralian Guadalupian Lopingian The Geological Society of Japan Ishiga1990 UT-3UT-2UT-1 3 UT-3 UT-3, 1980, 2009UT-3 UT-3
2 118 竹村 静夫ほか おお い UT-2 亜帯は大飯層 広川ほか, 1957; Ishiga, 1986 とそ の相当層からなるが 大飯層に明確に対比される地層は 兵 庫県東部以東にだけ分布する大飯層および相当層は一般に 泥岩 砂岩 珪質泥岩 チャートからなり 一部に珪長質凝 灰岩を伴う本層のチャート 珪質泥岩 泥岩からは中期ペ ルム紀末 後期ペルム紀中頃の放散虫化石が産する 例えば,, 1988 Ishiga, 1985; 木村 ひ かみ UT-1 亜 帯 は 氷 上 層 広 川 ほか, 1957; Caridroit et al., 1985; Ishiga, 1986 とその相当層からなり 主に泥岩と緑 色砂岩から構成される氷上層相当層は福井県西部から岡山 県南部にかけて広く連続的に分布するが 鍵層を欠くため正 確な層序の対比は困難である本層は中 上部ペルム系とさ 化石の産出に乏しく 詳しい年代 れてきたが 栗本, 1986 は不明に近い状態にある 竹村ほか, 上月層 Fig. 1. Simplified geological map showing the tectonic units of the Kinki Chugoku region. Inset map shows the location of the study area within Japan. 今回 新たにデボン紀チャート層の存在が明らかとなった 上月層は UT-3 亜帯を代表する地層であり 岡山県東部の さよ うち ょう 美作市から兵庫県西南部の佐 用 町にかけて広く分布する 本層は主として泥岩 珪長質凝灰岩 玄武岩類 砂岩からな 泥 り ごく少量の石灰岩とチャート 礫岩を伴う Fig. 2 岩は一般に珪質またはシルト質で 黒色 暗灰色で強い剥離 Fig. 2. Simplified geological map of the Mimasaka Kozuki region after Takemura (1997), showing the location of the Shiramizu outcrop (Loc. A).
3 地質雑 超丹波帯ペルム系上月層中のデボン紀チャート層 Fig. 3. (a) Photograph of the Shiramizu outcrop and (b) schematic sketch. 性をもつことが多い珪長質凝灰岩は暗灰色 灰緑色を呈 化石産出地点の岩相 し シルトから細粒砂サイズの火山砕屑物から構成される 一般に珪長質凝灰岩は泥岩とともに産し 両者は整然とした 互層から 珪長質凝灰岩が含礫泥岩の礫として含まれる場合 しら デボン紀の放散虫化石が産出した露頭は美作市東部の白 水に位置し N, E; Fig. 2 南西から みず 町西部の稗田などに産し 境界部では苦鉄質凝灰岩と互層す 北東に流れる小河川沿いに露出する 以下, 白水露頭 Fig. 3 白水露頭の水平方向の幅は 24 m 以上あり 南西部には 10 m 以上にわたり泥岩 北東部には約 14 m の幅で玄武岩 ることがあるチャートは泥岩中のブロック または玄武岩 類とチャートが露出する南西部の泥岩は 低角な断層で見 類に伴われて産するが その量は少なく 一般に再結晶が著 掛けの下位にあたる玄武岩類およびチャートと接している まで 産状が連続的に変化する玄武岩類は苦鉄質凝灰岩と 変質した玄武岩からなる石灰岩は玄武岩類に付随して佐用 ひえ だ しい 兵庫県佐用町最西部の稗田付近に分布する上月層の石灰岩 からは Fusulinella sp. など石炭紀を示すフズリナ化石や サンゴ化石が産出している 後藤 山際, 1973; 猪木, 1969 また 同じく稗田付近のチャートからは Pseudoalbaillella bulbosa Ishiga など前期ペルム紀初期の放散虫化石が報告 上月層の砕屑岩類からは 多くの された 後藤 堀, 1985 Fig. 3 本露頭の北東部では 玄武岩類はチャートを挟んで北東と 南西の両側に分布するが 北東端の玄武岩類とチャートの境 界は露出状況が悪く 両者の関係は不明瞭である一方 南 西側の玄武岩類とチャートは 一部で弱い剪断面で接するも のの 多くは密着 漸移している 玄武岩類は変質の進んだ玄武岩と苦鉄質凝灰岩であり 灰 地点の泥岩と珪長質凝灰岩より Follicucullus charveti Caridroit and De Wever などの中期ペルム紀末 後期ペル 緑 暗灰色または赤褐色を呈することが多い玄武岩に初生 ム紀初期の放散虫化石が報告された Pillai and Ishiga, 1987 さらに 一部の泥岩からは Albaillella asymmetri- ま 果状の集合体を構成しているのが観察される Fig. 4a た 二次鉱物として方解石と緑泥石が多く見られ 一部の試 ca Ishiga and Imoto など前期ペルム紀末 中期ペルム紀中 鉱物はほとんど残っていないが 鏡下では羽毛状の鉱物が球 料にはぶどう石が生じている 上月層 頃の放散虫化石が報告されており 竹村ほか, 1993 チャートは赤 茶褐色または灰 黒色を呈し 色調の変化 の形成年代はおよそ中 後期ペルム紀であると考えられてい による厚さ数 mm 以下の葉理が発達する多量の放散虫化 る 竹村ほか, チャートの上位 石がチャートには含まれている Fig. 4b
4 120 竹村 静夫ほか Fig. 4. Thin-section photomicrographs of samples from the Shiramizu outcrop. (a) Basalt. Left and right are plane- and cross-polarized light images, respectively. Altered variolitic minerals are scattered throughout the rock mass. (b) Chert. Radiolarian fossils and laminas are observed. (c) Chert and black layer. Radiolarian fossils are not found in the black layer without the boundary region with the chert. (d) Close-up of the boundary between the chert and the black layer. Note that well-preserved radiolarian shells are present in the black layer. 方向は不明であるが 全体の層厚は 7 m 以上で N50 70 W N の走向 傾斜を示すまた チャートは Fig. 5 厚さ数 mm 十数 cm の黒色層を頻繁に挟在する チャート層内で認められる面構造は 前述したチャートの 色調変化とこの黒色層により構成されており 珪質泥岩を伴 う一般的な層状チャートとは産状が異なるこれらの黒色層 反射顕微鏡や は薄片においても光を透過しない Fig. 4c EDS エネルギー分散型 X 線分析装置 などによる観察 分 析の結果 黒色層は大部分が磁鉄鉱で構成されており それ に葉理状の磁硫鉄鉱を伴うことが明らかとなったなお 放 散虫化石はチャートの部分に多く含まれるのに対して 黒色 ただし 黒色層部 層部にはほとんど存在しない Fig. 4c 中でもチャートとの境界部には保存良好な放散虫化石が認め られる Fig. 4d 産出した放散虫化石とその年代 本研究では白水露頭より主にチャートの試料を約 30 カ所 泥岩試料を 5 カ所から採取し 放散虫化石の抽出を行った Fig. 5. Field occurrence of bedded chert with black layers (white arrows).
5 % 24 Trilonche Albaillellaria 1 12% % Albaillellaria Fig. 6 Albaillellaria Holoeciscus foremanae Chen Holoeciscus elongatus Kiessling and Tragelehn Ceratoikiscum cf. avimexpectans Defrandre Entactinaria Palaeoscendium cladophorum Defrandre Trilonche Triaenosphaera Nassellaria Archocyrtium Popofskyellidae Holoeciscus Foreman1963 Albaillellaria , Cheng, 1986; Aitchison, 1990 Holoeciscus H. foremanae H. elongatus 2 H. foremanae Cheng1986 H. foremanae Maletz, 2011; Schwartzapfel and Holdsworth, 1996 Kiessling and Tragelehn, 1994Wang et al., 1998; Wang et al., 2006 Famennian H. elongatus Kiessling and Tragelehn1994 H. foremanae Schwartzapfel and Holdsworth1996 H. longus H. foremanae Famennian Palaeoscenidium cladophorum Ceratoikiscum avimexpectansarchocyrtium Popofskyellidae Albaillellaria Frasnian Helenifore Albaillella Famennian,, 2009, Fig. 4c Suhaylah Fleet and Robertson, 1980; Alabaster and Pearce, 1985; Hara and Kurihara, 2017 EDS, 1973, Ishiga, 1990, 1993
6 Fig.. Scanning electron microscope images of selected radiolarian fossils. 1 3: Holoeciscus foremanae Cheng, 4 & 5: Holoeciscus elongatus Kiessling and Tragelehn, 6: Ceratoikiscum cf. avimexpectans Deflandre, 7 & 8: Palaeoscenidium cladophorum Defrandre, 9: Trilonche sp., 10: Triaenosphaera cf. hebes Won, 11: Archocyrtium cf. dilatipes Deflandre, 12: Popofskyellidae, gen. et sp. indet., Scale bars are 50 µm., Kojima et al., 2016, Kammera et al., 1990, Mizutani, 1990 Visean, 2003
7 , 2002 Palmatolepis 3 P. glabra prima Ziegler and Huddle Famennian Palmatolepis crepida P. marginifera H. foremanae Wang et al.,2006 Famennian Palmatolepis crepida P. postera MORB, 2008, 2005;, 2008 Aitchison, J. C., 1990, Significance of Devonian-Carboniferous radiolarians from accretionary terranes of the New England Orogen, Eastern Australia. Mar. Micropaleont., 15, Alabaster, T. and Pearce, T. A., 1985, The interrelationship between magmatic ore-forming hydrothermal process in the Oman Ophiolite. Economic Geol., 80, Cheng, Y. N., 1986, Taxonomic studies on Upper Paleozoic Radiolaria. Natl. Mus. Nat. Sci., Taiwan, Spec. Publ., 1, 311p. Caridroit, M., Ichikawa, K. and Charvet, J., 1985, The Ultra- Tamba Zone, a new unit in the Inner Zone of Southwest Japan-its importance in the nappe structure after the example of the Maizuru area-. Earth Sci.Chikyu Kagaku, 39, Ehiro, M. and Suzuki, N., 2003, Redefinition of the Hayachine Tectonic Belt of Northeast Japan and a proposal of a new tectonic unit, the Nedamo BeltJapan. Jour. Struct. Geol., 47, Fleet, A. J. and Robertson, A. H. F., 1980, Oceanic-ridge metalliferous and pelagic sediments of the S Nappe, Oman. Jour. Geol. Soc. London, 137, Foreman, H. P., 1963, Upper Devonian Radiolaria from the Huron member of the Ohio shale. Micropaleont., 9, Goto, H. and Hori, R., 1985, Geology of northern part of the Kozuki-Tatsuno BeltKamigori Belt, Southwest Japan* 92 92th Annu. Meet. Geol. Soc. Japan, Abstr., 189 Goto, H.,and Yamagiwa, N., 1973, Fusulinids from the Upper Palaeozoic in Kozuki-machi, Sayo-gun, Hyogo Prefecture, Southwest Japan Jour. Geol. Soc. Japan, 79, Hamano, K., Iwata, K., Kawamura, M. and Kitakami Paleozoic Research Group, 2002, Late Devonian conodont age of red chert intercalated in greenstones of the Hayachine Belt, Northeast JapanJour. Geol. Soc. Japan, 108, Hara, K. and Kurihara, T., 2017, Radiolarian age and lithostratigraphy of Late Cretaceous pelagic sediments overlying basaltic extrusive rocks, northern Oman Mountains. Ofioliti, 42, Hirokawa, O., Isomi, H. and Kurokawa, K., 1957, 5 1 Geology of the Obama district. With Geological Sheet Map at 1: 50,000, Geol. Surv. Japan, 31p. Igi, S., 1969, Findings of the Carboniferous corals from the so-called Kamigori Structural Belt, JapanBull. Geol. Surv. Japan, 20, Igi, S. and Wadatsumi, K, 1980, 5 1 Geology of the Kamigori district. With Geological Sheet Map at 1: 50,000, Geol. Surv. Japan, 70p. Ishiga, H., 1985, Discovery of Permian radiolarians from Katsumi and Oi Formations along south of Maizuru Belt, Southest Japan and its significance. Earth Sci.Chikyu Kagaku, 39, Ishiga, H., 1986, Ultra-Tamba Zone of Southwest Japan. Jour. Geosci. Osaka City Univ., 29, Ishiga, H., 1990, Ultra-Tamba Terrane. In Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A., eds., Pre-Cretaceous Terranes of Japan. Publ. IGCP 224, Osaka, Kammera, K., Sano, H. and Isozaki, Y., 1990, Akiyoshi Terrane. In Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A., eds., Pre-Cretaceous Terranes of Japan. Publ. IGCP 224, Osaka, Kiessling, W. and Tragelehn, H., 1994, Devonian radiolarian faunas of conodont-dated localities in the Frankenwald Northern Bavaria, Germany. Abh. Geol. B.-A. Wien, 50, Kimura, K., 1988, Geology and tectonic setting of the Ultra-Tamba Belt in the western part of Ayabe City, Kyoto Prefecture, Southwest JapanJour. Geol. Soc. Japan, 94, Kojima, S., Kemkin, I. V., Kametaka, M. and Ando, A., 2000, A correlation of accretionary complexes of southern Sikhote- Alin of Russia and the Inner Zone of Southwest Japan. Geosci. Jour., 4, Kojima, S., Hayasaka, Y., Hiroi, Y, Matsuoka, A., Sano, H., Sugamori, Y.,Uchino, T., 2016, 2b Pre-Cretaceous accretionary complexes. In Moreno, T., Wallis, S., Kojima, T. and Gibbons, W., eds., The Geology of Japan, Geol. Soc., London, Kurimoto, C., 1986, Ultra-Tamba Zore in the Fukuchiyama area, Kyoto Prefecture: its constituent rocks and dis-
8 tributionearth Sci.Chikyu Kagaku, 40, Maletz, J., 2011, Tetrentactinia barysphaera Foreman, 1963: skeletal structure and age of a biostratigraphically important FamennianUpper Devonianradiolarian from the Ohio Shale, USA. Paläontol. Z., 85, Mizutani, S., 1990, Mino Terrane. In Ichikawa, K., Mizutani, S., Hara, I., Hada, S. and Yao, A., eds., Pre-Cretaceous Terranes of Japan. Publ. IGCP 224, Osaka, Pillai, D. L. and Ishiga, H., 1987, Discovery of Late Permian radiolarians from Kozuki Formation, Kozuki-Tatsuno Belt, Southwest Japan. Jour. Geol. Soc. Japan, 93, Schwartzapfel, J. A. and Holdsworth, B. K., 1996, Upper Devonian and Mississippian radiolarian zonation and biostratigraphy of the Woodford, Sycamore, Caney and Goddard Formations, Oklahoma. Cushman Foundation for Foraminineral Research, Spec. Publ., 33, Sugamori, Y., 2009,, Ultra-Tamba Terrane in the Kawanishi-Inagawa area, southern part of Hyogo Prefecture, Southwest Japan Jour. Geol. Soc. Japan, 115, Suzuki, N., Aita, Y. and Kurihara, T., 2012, 4, 4.2 Chapter 4, Microfossil world, 4.2 Shape of microfossils: Variety of radiolarian shapes in different geologic ages and habitats Microfossils: Their Microscopic World ExploredTokai Univ. Press, Suzuki, S. and Kiminami, K., 2009, 2., 2.1, 6 Regional Geology of Japan, Part 6: Chugoku, Asakura Publ., Takemura, S., 1997, Folding and related structures of the Maizuru and Ultra-Tamba zones in the Kozuki-Mimasaka area, Southwest Japan. Jour. Geosci. Osaka City Univ., 40, Takemura, S., Sugamori, Y. and Suzuki, S., 2009, Maizuru and Ultra-Tamba zones in eastern Okayama and southwestern Hyogo prefectures, southwest JapanJour. Geol. Soc. Japan, 115, S123 S137. Takemura, S., Suzuki, S. and Ishiga, H., 1993, Albaillella asymetrica Stratigraphy of the Kozuki Formation, Kamigori Zone Southwest Hyogo Prefecture, Japan, reconsideration with the discovery of Albaillella asymmetricaradiolarian fossil and the strucural analysisjour. Geol. Soc. Japan, 99, Uchino, T. Kurihara, T. and Kawamura, M., 2005, Early Carboniferous radiolarians discovered from the Hyachine Teraane, Northwest Japan: the oldest fossil age for clasitc rocks of accretionary complex in JapanJour. Geol. Soc. Japan, 111, Uchino, T., Kawamura, M. and Kawamura, T., 2008, Lithology of the Nedamo Terrane, an Early Carboniferous accretionary complex, and its southern boundary with the South Kitakami TerraneJour. Geol. Soc. Japan, 114, S141 S157. Wang, Y. J., Luo, H. and Aitchison, J. C., 2006, Influence of the Frasnian-Famennian event on radiolarian faunas. Eclogae Geol. Helv., 99, Suppl. 1, Wang, Y. J., Luo, H., Kuang, G. D. and Li, J. X., 1998, Late Devonian-Late Permian strata of cherty facies at Xiaodong and Bancheng counties of the Qinzhou area, SE Guangxi. Acta Micropalaeont. Sin., 15, in Chinese with English abstract. Yano, K., Ishida, K., Namiki, H., Sakamoto, K. and Kato, T., 1993, New findings of a formation corresponding to the Ultra Tamba Zone to the east of the Fossa Magna th Annu. Meet. Geol. Soc. Japan, Abstr., takesizu@hyogo-u.ac.jp takemura@ hyogo-u.ac.jp / sugamori@muses.tottori-u.ac.jp furutani@hitohaku.jp Takemura S., Takemura A., Ueno H., Sugamori Y. and Furutani H., 2018, Devonian chert in the Permian Kozuki Formation of the Ultra-Tamba Zone, eastern Okayama Prefecture, Southwest Japan. Jour. Geol. Soc. Japan,, Holoeciscus foremanae Fammenian
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