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Is the peat bed in the Kanto Plain rework of kuroboku soil?

Research Project

Project/Area Number 21K03690
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17030:Human geosciences-related
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Tanabe Susumu  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 上級主任研究員 (50415709)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords関東平野 / 中川低地 / 泥炭層 / 黒ボク土 / 黒泥 / 弥生の小海退 / 沖積層 / 堆積相 / 放射性炭素年代 / 海水準変動 / 放射性炭素年代値 / 加須低地 / 利根川 / 完新世中期 / 「弥生の小海退」
Outline of Research at the Start

関東平野における一部の泥炭層は,いわゆる腐植ではなく,微粒子有機物を主体とする有機質シルト層から構成される.申請者は,この有機質シルト層が黒ボク土の再堆積物であるという着想を得た.これによって,埼玉県東部の加須低地に広く分布する泥炭層の形成は,「弥生の小海退」の海水準低下に伴う堆積場の下流への移動と台地表層の黒ボク土の侵食,そしてその微粒子有機物の沖積低地への流入によって説明ができる.本研究では,このような仮説が正しいか,加須低地における基準コアの掘削・解析と古地理の復元によって迫る.

Outline of Final Research Achievements

In the Nakagawa and Kazo lowlands in the central Kanto Plain, so-called peat layers are widely distributed around 0 m elevation. However, unlike ordinary peat composed of undecomposed plant material, this peat layer is composed mainly of fine-grained organic material and thickens upstream of the alluvial lowlands and along the margins of the uplands. In this study, sediment core analysis and high-density radiocarbon dating were conducted to elucidate the formation mechanism of the peat layers. As a result, the peat layers in the Nakagawa Lowland are mainly composed of local muck, as initially suggested as one of the possibilities, and the reason for the widespread development of peat layers in the inland is that the bypass of clastic materials in the upper reaches and the deposition of clastic materials in the lower reaches were synchronized with the Yayoi regression.

Academic Significance and Societal Importance of the Research Achievements

濃尾平野や豊川平野,矢作川下流低地には,弥生の小海退に伴って形成されたと考えられる埋積浅谷の基底部に泥炭層が厚く発達する.近年,埋積浅谷の形成要因として,堆積中心の海側への移動に伴う,内陸側における侵食と海側における堆積の同時進行が提唱されている.本研究は,多数の堆積物コアと放射性炭素年代値に基づいて,このような埋積浅谷の形成モデルと泥炭層の発達さらには海水準変動との関係を明確にしたものであり,関東平野と東海地方には類似した泥炭層の形成メカニズムがあったことを示唆する.本研究は,関東平野中央部における流域全体を捉えた泥炭層の発達モデルを構築できた点に意義がある.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 3 results) Presentation (2 results) (of which Invited: 2 results) Remarks (2 results)

  • [Int'l Joint Research] ボローニャ大学(イタリア)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Delta initiation under low sediment discharge: Insights from Holocene incised valley fills north of Tokyo Bay, central Japan2023

    • Author(s)
      Tanabe Susumu、Hong Wan、Park Junghun、Kitagawa Hiroyuki
    • Journal Title

      Marine Geology

      Volume: 463 Pages: 107101-107101

    • DOI

      10.1016/j.margeo.2023.107101

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Grain-size variability and formation process of lowstand river sediments in the Japanese Islands: A review and outlook2023

    • Author(s)
      Tanabe Susumu、Komatsubara Taku、Hori Kazuaki
    • Journal Title

      Earth-Science Reviews

      Volume: 243 Pages: 104504-104504

    • DOI

      10.1016/j.earscirev.2023.104504

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Accumulation of thick fluvial sediments in the Shinano River incised-valley fills: implications for sequence stratigraphy and alluvial architecture2023

    • Author(s)
      Hori Kazuaki、Tanabe Susumu、Urabe Atsushi
    • Journal Title

      Journal of Sedimentary Research

      Volume: 93 Issue: 7 Pages: 453-462

    • DOI

      10.2110/jsr.2022.049

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Holocene filling of a narrow estuary in a regressive coast: The Paleo-Kinu Bay region, central Japan2022

    • Author(s)
      Tanabe Susumu、Nakashima Rei、Mizuno Kiyohide
    • Journal Title

      Marine Geology

      Volume: 447 Pages: 106795-106795

    • DOI

      10.1016/j.margeo.2022.106795

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] A 3-kyr plateau of middle Holocene higher sea levels on the central Kanto Plain, Japan2022

    • Author(s)
      Tanabe Susumu
    • Journal Title

      Quaternary Science Reviews

      Volume: 295 Pages: 107769-107769

    • DOI

      10.1016/j.quascirev.2022.107769

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Recycling of clastics in coast areas inferred from quantitative analysis of reworked radiocarbon samples2022

    • Author(s)
      Susumu Tanabe, Toshimichi Nakanishi, Rei Nakashima
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 650-650

    • DOI

      10.1038/s41598-021-04660-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Basal topography of the post-LGM incised-valley fills beneath the central area of the Kanto Plain, Japan2021

    • Author(s)
      Tanabe Susumu
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 127 Issue: 10 Pages: 635-648

    • DOI

      10.5575/geosoc.2021.0019

    • NAID

      130008138592

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2021-10-15
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Transition from a transgressive to a regressive river-mouth sediment body in Tokyo Bay during the early Holocene: Sedimentary facies, geometry, and stacking pattern.2021

    • Author(s)
      Tanabe, S., Nakashima, R., Ishihara, Y.
    • Journal Title

      Sedimentary Geology

      Volume: 428 Pages: 106059-106059

    • DOI

      10.1016/j.sedgeo.2021.106059

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Visualization of "soft mud" beneath the coastal lowlands north of Tokyo Bay: Clarification of relationships among subsurface geology, past earthquake and subsidence disasters2023

    • Author(s)
      Susumu Tanabe, Yoshiro Ishihara, Rei Nakashima
    • Organizer
      IGAG Seminar, CNR, Italy
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Soft mud beneath the coastal lowlands north of Tokyo Bay: Relationship between subsurface geology and past earthquake and subsidence disasters2023

    • Author(s)
      Susumu Tanabe, Yoshiro Ishihara, Rei Nakashima
    • Organizer
      BiGeA Seminar, Univ. Bologna, Italy
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Remarks] Google Scholar

    • URL

      https://scholar.google.co.jp/citations?user=qzu8eIUAAAAJ&hl=ja

    • Related Report
      2023 Annual Research Report
  • [Remarks] 平野地質研究グループ研究成果

    • URL

      https://unit.aist.go.jp/igg/qb-rg/achievements_p.html

    • Related Report
      2023 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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