Reconstructing erosion rates to understand the interactions between tectonics and climate

• Project/Area Number: 18K13624
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 17030:Human geosciences-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Nakamura Atsunori 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, 研究員 (60817419)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 宇宙線生成核種 / 侵食 / モンスーン / テクトニクス / 照射年代 / 加速器質量分析 / 10Be / 26Al / 年代

Outline of Final Research Achievements

Erosion is one of the main drivers that shapes the Earth's surface. This study developed methodologies in geochronology to improve the analytical techniques for measuring in-situ-produced cosmogenic nuclides. The results allowed us to obtain remarkably fast erosion rates and young exposure ages. We reconstructed the changes in erosion rates over the last twenty thousand years.

Academic Significance and Societal Importance of the Research Achievements

地球上の地形がどのように形作られてきたかを明らかにするには，山地や山脈の侵食速度を知る必要がある．本研究は侵食速度を求めるために利用される宇宙線生成核種を用いた地球化学的手法の適用範囲を拡大させたことに意義がある．また，過去の侵食変動を明らかにすることは，気候変動に地表の侵食がどう応答するのかを把握する上で重要な知見となる．

Research Products

• [Journal Article] Watershed analysis for geochemical mapping in Japan based on a hydrologic model: The concentrations of 53 elements and the dominant lithology in a drainage basin (2021)
  • Author(s): Ohta, A., Imai, N., Okai, T., Manaka, M., Kubota, R., Nakamura, A., Tachibana, Y.
  • Journal Title: Geochemical Journal Volume: 55 Issue: 2 Pages: 59-88
  • DOI: 10.2343/geochemj.2.0618
  • NAID: 130008119448
  • Peer Reviewed / Open Access
• [Journal Article] Optimizing the Pratt-type titrimetric method to determine FeO in geochemical reference materials (2020)
  • Author(s): Nakamura, A. Okai, T., Ohta, A.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 54 Issue: 5 Pages: 337-350
  • DOI: 10.2343/geochemj.2.0605
  • NAID: 130007923224
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access
• [Journal Article] In-situ and meteoric 10Be and 26Al measurements: Improved preparation and application at the University of Tokyo (2019)
  • Author(s): Yokoyama, Y., Yamane, M., Nakamura, A., Miyairi, Y., Horiuchi, K., Aze, T., Matsuzaki, H., Shirahama, Y., Ando, Y.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 印刷中 Pages: 260-264
  • DOI: 10.1016/j.nimb.2019.01.026
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mt. Fuji Holocene eruption history reconstructed from proximal lake sediments and high-density radiocarbon dating (2018)
  • Author(s): Obrochta S.P.、Yokoyama Y.、Yoshimoto M.、Yamamoto S.、Miyairi Y.、Nagano G.、Nakamura A.、Tsunematsu K.、Lamair L.、Hubert-Ferrari A.、Lougheed B.C.、Hokanishi A.、Yasuda A.、Heyvaert V.M.A.、De Batist M.、Fujiwara O.
  • Journal Title: Quaternary Science Reviews Volume: 200 Pages: 395-405
  • DOI: 10.1016/j.quascirev.2018.09.001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 二価鉄滴定法の最適化: 地球化学標準物質の値付けおよび未知試料分析への示唆 (2020)
  • Author(s): 中村 淳路，岡井 貴司，太田 充恒
  • Organizer: 2020年度日本地球化学会第67回年会
• [Presentation] 10Be/9Be ratios of Be-bearing minerals and suitability for use as Be carrier (2019)
  • Author(s): Nakamura, A., Okai. T., Hiroyuki, M., Ohta, A.
  • Organizer: Goldschmidt 2019
  • Int'l Joint Research
• [Presentation] 地球化学標準物質の認証値決定のための二価鉄滴定法の最適化 (2019)
  • Author(s): 中村 淳路，岡井 貴司，太田 充恒
  • Organizer: 2019年度日本地球化学会年会
• [Presentation] Low-level 10Be measurements with phenakite carrier (2019)
  • Author(s): Nakamura, A., Okai. T., Ohta, A., Hiroyuki, M.
  • Organizer: EGU General Assembly 2019
  • Int'l Joint Research
• [Presentation] 地球表層物質の宇宙線生成核種(10Be, 26Al)の分析方法の改良と地球科学研究 (2019)
  • Author(s): 横山 祐典，山根 雅子，中村 淳路，宮入 陽介，堀内 一穂，阿瀬 貴博，松崎 浩之，白濱 吉起，安藤 有加
  • Organizer: 日本地球惑星科学連合2019年大会
• [Presentation] Climatic Controls on Paleo-Erosion Rates in Mid-Latitude Monsoon Regions (2018)
  • Author(s): Nakamura, A., Yokoyama. Y., Hiroyuki M.
  • Organizer: Goldschmidt 2018
  • Int'l Joint Research
• [Presentation] 宇宙線照射生成核種(10Be)を用いた侵食速度の研究について (2018)
  • Author(s): 中村淳路
  • Organizer: 2018年度日本地球化学会年会
  • Invited