Algorithms for demise and regeneration of accretionary complexes

• Project/Area Number: 16K05579
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Yamaguchi University
• Principal Investigator: Koji Wakita 山口大学, 地域未来創生センター, 教授(特命) (80358366)
• Project Period (FY): 2016-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 付加体 / 地質学 / 砕屑性ジルコン年代 / 放散虫化石 / メランジュ / 石灰岩 / チャート / 秋吉帯 / ペルム紀 / 秋吉石灰岩 / 逆転構造 / ペルム系 / 逆転層 / 大田層群 / 別府層 / 常森層 / 厚保層群 / 付加-衝突帯 / ジュラ紀 / 海洋プレート層序 / 砕屑性ジルコン / U-Pb年代 / 後背地 / 石灰礁 / 海台 / 火成活動 / 三畳紀 / 白亜紀 / トリアス紀 / 海山 / イライト結晶度 / ビトリナイト反射率

Outline of Final Research Achievements

Accretionary prisms constitute one of the most important components of the geological formations in Japan. The large non-metamorphic accretionary complexes in Japan are the Permian, Jurassic, and Cretaceous-Paleogene accretionary complexes. For a long time, it has been a mystery as to why these accretionary complexes formed and why they did not form at other times. In this study, we have clarified the relationship between the ebb and flow of magmatic activity and the formation of accretionary complexes by examining the ages of detrital zircons contained in Paleo-Mesozoic strata. This study has also explained the collision process of giant submarine volcanoes, which was key to the end of the accretionary complex by means of geological investigation in the Permian accretionary complex of the Akiyoshi Belt.

Academic Significance and Societal Importance of the Research Achievements

近年、日本各地でジオパーク活動が広がりを見せ、ブラタモリなどの人気番組でも取り上げられるなど、一般の人々にとっても地質学は身近なものになりつつある。付加体は日本各地に分布し、各地の重要な基盤岩となっている。本研究では、付加体の形成過程について最新の知識を公表し、一般市民に対しても分かりやすく発信し、ジオパーク観光などで、付加体の正しい知識を身につけ、日本の地質の深淵に触れることを可能にした。

Research Products

• [Int'l Joint Research] University of New England(Australia)
• [Int'l Joint Research] Royal Halloway, University of London(United Kingdom)
• [Journal Article] Concept of OPS melange and its field mapping technique for ancient accretionary complexes (2021)
  • Author(s): Koji Wakita
  • Journal Title: 地質科学 Volume: 56 Pages: 395-429
  • Peer Reviewed / Open Access
• [Journal Article] Tectonic setting required for the preservation of sedimentary m?langes in Palaeozoic and Mesozoic accretionary complexes of southwest Japan (2019)
  • Author(s): Wakita Koji
  • Journal Title: Gondwana Research Volume: - Pages: 90-100
  • DOI: 10.1016/j.gr.2019.03.006
  • Peer Reviewed
• [Journal Article] Phanerozoic accretionary history of Japan and the western Pacific margin (2018)
  • Author(s): Wakita, K., Nakagawa, T., Sakata, M.,Tanaka, N., Oyama, N.
  • Journal Title: Geological Magazine Volume: - Issue: 1 Pages: 13-29
  • DOI: 10.1017/s0016756818000742
  • Peer Reviewed
• [Journal Article] Tectonic setting for Tsunemori Formation in the Permian accretionary complex of the Akiyoshi Belt, Southwest Japan (2018)
  • Author(s): Wakita, K., Yoshida, R., Fushimi, Y.
  • Journal Title: Hellion Volume: - Issue: 12 Pages: e01084-e01084
  • DOI: 10.1016/j.heliyon.2018.e01084
  • Peer Reviewed / Open Access
• [Journal Article] The geological history of the Latimojong region of western Sulawesi, Indonesia (2017)
  • Author(s): White,L.T., Hall, R., Armstrong, R.A., Barber, A.J., Fadel, M.B., Baxter, A., Wakita, K, Manning, C., and Soesilo, J
  • Journal Title: Journal of Asian Earth Sciences Volume: 138 Pages: 72-91
  • DOI: 10.1016/j.jseaes.2017.02.005
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Lower Permian conodonts from Paleo-Tethys Ocean Plate Stratigraphy in the Chiang Mai-Chiang Rai Suture Zone, northern Thailand (2017)
  • Author(s): Metcalfe, I, Henderson, C.M. and Wakita, K.
  • Journal Title: Gondwana Research Volume: 44 Pages: 54-66
  • DOI: 10.1016/j.gr.2016.12.003
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Discovery of the manganese carbonate rock yielding late Early Permian radiolarians in the Nishiki Group, Akiyoshi Belt, Southwest Japan (2016)
  • Author(s): 中川孝典・脇田浩二
  • Journal Title: The Journal of the Geological Society of Japan Volume: 122 Issue: 12 Pages: 659-664
  • DOI: 10.5575/geosoc.2016.0046
  • NAID: 130005439760
  • ISSN: 0016-7630, 1349-9963
  • Year and Date: 2016-12-15
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 秋吉帯錦層群中のマンガン炭酸塩岩から産出したペルム紀古世放散虫化石 (2016)
  • Author(s): 中川孝典・脇田浩二
  • Journal Title: 第12回放散虫研究集会論文集 Volume: 16 Pages: 25-40
  • Peer Reviewed
• [Presentation] Geological History of the Late Paleozoic Convergent Margin along the Proto-Japan Arc (2022)
  • Author(s): Koji Wakita, Hokuto Obara
  • Organizer: American Geophysical Union 2022 Fall Meeting
  • Int'l Joint Research
• [Presentation] 秋吉石灰岩周辺のペルム紀付加体の地質構造と付加モデル (2021)
  • Author(s): 脇田浩二・辻 智大・亀高正男
  • Organizer: 日本地質学会第128年学術大会名古屋大会
• [Presentation] ペルム紀付加体における秋吉石灰岩の位置づけ (2020)
  • Author(s): 脇田浩二
  • Organizer: 地球惑星連合大会
• [Presentation] Seamount subduction and atoll carbonate detachment in the Permian convergent margin in East Asia (2020)
  • Author(s): Koji Wakita
  • Organizer: Annual Meeting of the Geological Society of America
  • Int'l Joint Research
• [Presentation] 付加体成長における石灰岩の役割 (2019)
  • Author(s): 脇田浩二
  • Organizer: 地球惑星連合大会
• [Presentation] 日本列島の顕生代付加体の形成場と後背地の変遷 (2019)
  • Author(s): 脇田浩二
  • Organizer: 日本地質学会
• [Presentation] 日本のジュラ紀付加体とペルム紀付加チアの類似点と相違点 (2019)
  • Author(s): 脇田浩二
  • Organizer: 日本地質学会
  • Invited
• [Presentation] Subduction and accretionary history of Japan and the western Pacific (2018)
  • Author(s): Wakita, K.
  • Organizer: Geological Society of America
  • Int'l Joint Research
• [Presentation] Three major stages for Phanerozoic accretionary processes recorded in Japan and East Asian continental margins. (2018)
  • Author(s): Wakita, K., Nakagawa, T.
  • Organizer: 地球惑星科学連合大会国際セッション
  • Int'l Joint Research
• [Presentation] Tectonic Control of melange formation and polygonetic origin : Examples from Paleozoic to Mesozoic accretionary complexes of Southwest Japan (2017)
  • Author(s): Koji Wakita
  • Organizer: Annual Meeting of Geological Society of America 2017 Seatle
  • Int'l Joint Research
• [Presentation] Missing Oceanic Plate Stratigraphy : A key to understanding continuous versus discontinuous accretionary complex formation in the Paleozoic to Mesozoic record of Southwest Japan (2017)
  • Author(s): Koji Wakita
  • Organizer: Annual Meeting of Geological Society of America 2017 Seatle
  • Int'l Joint Research
• [Presentation] ペルム系弱変形正常相堆積岩類の分布と特徴 (2017)
  • Author(s): 脇田浩二・伏見勇紀・田原幸太・鈴木茂之
  • Organizer: 日本地質学会第124年学術大会
• [Presentation] Permian Pseudoalbaillella from manganese carbonate rocks of Akiyoshi accretionary complex, Southwest Japan (2017)
  • Author(s): Nakagawa, T.
  • Organizer: InterRad XV in Niigata 2017
  • Int'l Joint Research
• [Presentation] 山口県美祢市三畳紀美祢層群昆虫化石データベース構想 (2016)
  • Author(s): 大山望・脇田浩二・高橋文雄・篠田健二
  • Organizer: 古生物学会2016年年会
  • Place of Presentation: 福井県立大学(福井県吉田郡永平寺町）
• [Presentation] 西南日本内帯ペルム系形成時のテクトニックセッティング (2016)
  • Author(s): 中川孝典・脇田浩二
  • Organizer: 日本地質学会第123年学術大会
  • Place of Presentation: 日本大学文理学部(東京都世田谷区）
• [Presentation] 山口県美祢市における秋吉帯常森層の岩相と堆積環境 (2016)
  • Author(s): 脇田浩二・吉田瑠璃
  • Organizer: 日本地質学会第123年学術大会
  • Place of Presentation: 日本大学文理学部(東京都世田谷区）
• [Presentation] 山口県周南市鹿野東方長野山地域における錦層群の地質と放散虫化石層序 (2016)
  • Author(s): 田中菜月・中川孝典・脇田浩二
  • Organizer: 日本地質学会第123年学術大会
  • Place of Presentation: 日本大学文理学部(東京都世田谷区）
• [Book] 日本列島地質総覧-地史・地質環境・資源・災害- (2022)
  • Author(s): 加藤碵一・脇田浩二・斎藤眞・高木哲一・水野清秀・宮崎一博 (編集）
  • Total Pages: 460
  • Publisher: 朝倉書店
  • ISBN: 9784254162776
• [Book] Natural Heritage of Japan (2018)
  • Author(s): Charkarabory,A.,Mokudai, K., Cooper, M., Watanabe, M., Chakrabortty,S. eds.
  • Total Pages: 183
  • Publisher: Springer
  • ISBN: 9783319618951
• [Book] Natural Heritage of Japan (2018)
  • Author(s): Chakraborty, A., Mokudai, K., Cooper, M., Watanabe, M., Chakraborty, S. (Eds.)
  • Total Pages: 183
  • Publisher: Springer