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Chemical weathering of the Himalayan river system in Bangladesh: a multi-isotope approach

Research Project

Project/Area Number 16H05883
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Environmental dynamic analysis
Research InstitutionJapan Agency for Marine-Earth Science and Technology (2017-2019)
The University of Tokyo (2016)

Principal Investigator

YOSHIMURA Toshihiro  国立研究開発法人海洋研究開発機構, 海洋機能利用部門(生物地球化学プログラム), 研究員 (90710070)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Keywords化学風化 / ヒマラヤ / 同位体 / 氾濫原 / 削剥 / 河川 / 安定同位体比 / 風化 / 安定同位体 / 風化作用
Outline of Final Research Achievements

This study investigated spatial isotopic variations of Sr, Li, Mg, Ca, O and H in dry- and wet-season river waters from the Ganges, Brahmaputra, and Meghna river system and groundwater in the Bengal Plain, Bangladesh. The sediment load in low-altitude plains is derived from rapid denudation of high mountains, where physical erosion rate is high and hence material is incompletely weathered (i.e., weathering-limited regime). The river samples collected in dry and wet seasons were within the analytical error of our analyses, thus indicating that relative inputs from the distinct the sources were effectively the same at a given sampling site. For the Bengal Plain, chemical weathering at greater sediment depths is more congruent. The Himalayan-derived material continue to be actively weathered during their transit through the floodplain, which is an important knowledge for climate-weathering feedback.

Academic Significance and Societal Importance of the Research Achievements

ベンガル平野の河川水と地下水の同位体組成から、その溶質が上流の高山地帯からに由来するものではなく、多くは降雨と堆積物が反応することでもたらされたことが判明した。50m以深の地下水では化学組成がケイ酸塩鉱物の溶解反応の影響を多く受ける。本研究地域から海洋にもたらされる各種元素の同位体フラックスは非常に大きいため、長期的な海水の同位体組成に影響を及ぼす。地下水の同位体組成の平均値はガンジス・ブラマプトラ川の平均値と誤差の範囲で一致することから、化学風化が上流部と下流部で一致する定常状態にあることを示した。風化の気候影響を知る上で重要な知見である。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (31 results)

All 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (4 results) Journal Article (10 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 10 results,  Open Access: 3 results) Presentation (17 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results)

  • [Int'l Joint Research] Yunnan University(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Univ. degli Studi di Modena/Consorzio Univ. di Trapani/University of Parma(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Jessore Univ. of Sci. and Tech.(バングラデシュ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] パルマ大学/モデナ・レッジョ・エミリア大学(イタリア)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Seasonal and spatial variations of chemical weathering in the Mekong basin: From the headwaters to the lower reaches2020

    • Author(s)
      Kajita, H., Ota, Y., Yoshimura, Y., Araoka, D., Manaka, T., Ziyu, O., Iwasaki, S., Inamura, A., Uchida, E., Zheng, H., Yang, Q., Wang, K., Yanase, T., Suzuki, A., and Kawahata, H.
    • Journal Title

      Aquatic Geochemistry

      Volume: - Issue: 2 Pages: 1-23

    • DOI

      10.1007/s10498-020-09374-y

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Rapid Purification of Alkali and Alkaline-earth Elements for Isotope Analysis (δ <sup>7</sup>Li, δ <sup>26</sup>Mg, <sup>87</sup>Sr/<sup>86</sup>Sr, and δ <sup>88</sup>Sr) of Rock Samples Using Borate Fusion Followed by Ion Chromatography with a Fraction Collector System2019

    • Author(s)
      Araoka, D. and Yoshimura, T.
    • Journal Title

      Analytical Sciences

      Volume: 35 Issue: 7 Pages: 751-757

    • DOI

      10.2116/analsci.18P509

    • NAID

      130007676936

    • ISSN
      0910-6340, 1348-2246
    • Year and Date
      2019-07-10
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Partitioning and chemical environments of minor elements in individual large benthic foraminifera cultured in temperature-controlled tanks2019

    • Author(s)
      Yoshimura, T., Maeda, A., Tamenori, Y., Suzuki, A., Fujita, K., Kawahata, H.
    • Journal Title

      Frontiers in Earth Science

      Volume: 7 Pages: 124-124

    • DOI

      10.3389/feart.2019.00124

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Monthly changes in <I>p</I>CO<sub>2</sub> in the Ganges River: implications for carbon release from soil to the atmosphere via inland waters2019

    • Author(s)
      Manaka, T., Zakir, H., Yoshimura, T., Suzuki, A. and Kawahata, H.
    • Journal Title

      Journal of Agricultural Meteorology

      Volume: 75 Issue: 1 Pages: 47-55

    • DOI

      10.2480/agrmet.D-18-00007

    • NAID

      130007554941

    • ISSN
      0021-8588, 1881-0136
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Perspective on the response of marine calcifiers to global warming and ocean acidification?Behavior of corals and foraminifera in a high CO2 world “hot house”2019

    • Author(s)
      Kawahata Hodaka、Fujita Kazuhiko、Iguchi Akira、Inoue Mayuri、Iwasaki Shinya、Kuroyanagi Azumi、Maeda Ayumi、Manaka Takuya、Moriya Kazuyoshi、Takagi Haruka、Toyofuku Takashi、Yoshimura Toshihiro、Suzuki Atsushi
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 6 Issue: 1 Pages: 1-37

    • DOI

      10.1186/s40645-018-0239-9

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Efficient recycling of nutrients in modern and past hypersaline environments2019

    • Author(s)
      Isaji Y.、Kawahata H.、Ogawa N. O.、Kuroda J.、Yoshimura T.、Jimenez-Espejo F. J.、Makabe A.、Shibuya T.、Lugli S.、Santulli A.、Manzi V.、Roveri M.、Ohkouchi N.
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 3718-3718

    • DOI

      10.1038/s41598-019-40174-9

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Geochemical cycling of major elements and carbonates in the Earth’s surface environment2018

    • Author(s)
      吉村 寿紘
    • Journal Title

      Chikyukagaku

      Volume: 52 Issue: 3 Pages: 131-142

    • DOI

      10.14934/chikyukagaku.52.131

    • NAID

      130007486353

    • ISSN
      0386-4073, 2188-5923
    • Year and Date
      2018-09-25
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Lithium, magnesium and sulfur purification from seawater using an ion chromatograph with a fraction collector system for stable isotope measurements2018

    • Author(s)
      Yoshimura Toshihiro、Araoka Daisuke、Tamenori Yusuke、Kuroda Junichiro、Kawahata Hodaka、Ohkouchi Naohiko
    • Journal Title

      Journal of Chromatography A

      Volume: 1531 Pages: 157-162

    • DOI

      10.1016/j.chroma.2017.11.052

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Downstream and seasonal changes of lithium isotope ratios in the Ganges-Brahmaputra river system2017

    • Author(s)
      Manaka Takuya、Araoka Daisuke、Yoshimura Toshihiro、Hossain H. M. Zakir、Nishio Yoshiro、Suzuki Atsushi、Kawahata Hodaka
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 18 Issue: 8 Pages: 3003-3015

    • DOI

      10.1002/2016gc006738

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Altervalent substitution of sodium for calcium in biogenic calcite and aragonite2017

    • Author(s)
      Yoshimura, T., Tamenori, Y., Suzuki, A., Kawahata, H., Iwasaki, N., Hasegawa, H., Nguyen, L.T., Kuroyanagi, A., Yamazaki, T., Kuroda, J., Ohkouchi, N.,
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 202 Pages: 21-38

    • DOI

      10.1016/j.gca.2016.12.003

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Purification of alkali and alkaline-earth elements from environmental and biological samples using an ion chromatograph with a fraction collector system for stable isotope measurements2019

    • Author(s)
      Toshihiro Yoshimura
    • Organizer
      3rd Global User Meeting Ion Chromatography
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 大型底生有孔虫のMg同位体比と代替指標としての可能性2019

    • Author(s)
      前田 歩,吉村 寿紘,荒岡 大輔,鈴木 淳,為則 雄祐,藤田 和彦,豊福 高志,大河内 直彦,川幡 穂高
    • Organizer
      日本古生物学会第168回例会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 海水の蒸発に伴う主成分イオンの濃度変化とMg同位体比による地中海蒸発イべントの濃縮過程の復元2018

    • Author(s)
      吉村 寿紘, 荒岡 大輔, 黒田 潤一郎, 伊左治 雄太, 川幡 穂高, 大河内 直彦
    • Organizer
      日本地球化学会第65回年会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] δ88Srによる第四紀の化学風化と海洋の炭酸塩収支の復元2018

    • Author(s)
      吉村 寿紘, 若木 重行, 黒田 潤一郎, 山崎 俊嗣, 井口 亮, 高木 悠花, 木元 克典, 櫻本 晋洋, 大河内 直彦
    • Organizer
      第四回地球環境史学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 地中海メッシニアン期塩分危機に形成された蒸発岩のマグネシウム同位体組成2018

    • Author(s)
      吉村 寿紘, 荒岡 大輔, 黒田 潤一郎, 伊左治 雄太, Jimenez-Espejo Francisco, Lugli Stefano, Manzi Vinicio, Roveri Marco, 大河内 直彦
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Li, Mg, and S Purification from Seawater Using an Ion Chromatograph with a Fraction Collector System for Stable Isotope Measurements2018

    • Author(s)
      Toshihiro YOSHIMURA, Daisuke ARAOKA, Yusuke TAMENORI, Junichiro KURODA, Hodaka KAWAHATA, Naohiko OHKOUCHI
    • Organizer
      15th Annual Meeting of Aisa Oceania Geosciences Society
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 第四紀Sr同位体層序の精密化を目的とした放射起源Sr同位体比の超高精度分析2018

    • Author(s)
      若木重行, 吉村寿紘, 高柳栄子, 若木仁美
    • Organizer
      2018年度 日本地球化学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] サンゴ礁棲大型定性有孔虫の無性生殖個体から得たMg同位体比の評価2018

    • Author(s)
      前田 歩, 吉村 寿紘, 荒岡 大輔, 鈴木 淳, 藤田 和彦, 大河内 直彦, 川幡 穂高
    • Organizer
      第四回地球環境史学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] High precision radiogenic Sr isotope analyisis by TIMS - error sources and limitations2018

    • Author(s)
      Shigeyuki Wakaki, Toshihiro Yoshimura, Hideko Takayanagi, Hitomi Wakaki
    • Organizer
      3rd Korea-Japan Joint Meeting on Isotope-Ratio Mass spectrometry
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mg isotopic composition of submarine vent fluids from arc and back-arc hydrothermal systems in the western Pacific2018

    • Author(s)
      Eom Jiwon, Daisuke Araoka, Toshihiro Yoshimura, Toshitaka Gamo, Hodaka Kawahata
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 炭酸塩胚胎レアアース鉱床のマグネシウム同位体比は何を記録しているか?2018

    • Author(s)
      荒岡 大輔, 吉村 寿紘, 星野 美保子, 昆 慶明, 児玉 信介, Simandl George, Paradis Suzanne, Green Craig
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] A change in the net carbonate input during the Quaternary desuced from the 88Sr/86Sr record2017

    • Author(s)
      Yoshimura, T., Wakaki, S., Kuroda, J., Yamazaki, T., Iwasaki, S., Takagi, H., Kimoto, K., Sakuramoto, Y., Ishikawa, T. and Ohkouchi, N.
    • Organizer
      ASLO 2017 Ocean Sciences Meeting
    • Place of Presentation
      ホノルル市, ハワイ州, アメリカ合衆国
    • Year and Date
      2017-02-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] δ26Mg of the chloropigments from oxygenic and anoxygenic phototrophic bacteria inside benthic microbial mat of the Trapani solar salterns (Italy)2017

    • Author(s)
      Isaji, Y., Yoshimura, T., Araoka, D., Kuroda, J., Ogawa, N. O., Takano, Y., Jimenez-Espejo, F. J., Makabe, A., Suzuki, A., Shibuya, T., Lugli, S., Santulli, A., Manzi, V., Roveri, M., Kawahata, H. and Ohkouchi, N.
    • Organizer
      ASLO 2017 Ocean Sciences Meeting
    • Place of Presentation
      ホノルル市, ハワイ州, アメリカ合衆国
    • Year and Date
      2017-02-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of δ26Mg in large benthic foraminifera as a temperature proxy2017

    • Author(s)
      Ayumi Maeda、Toshihiro Yoshimura、Daisuke Araoka、Atsushi Suzuki、Kazuhiko Fujita、Takashi Toyofuku、Naohiko Ohkouchi、Hodaka Kawahata
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ストロンチウム安定同位体比から探る第四紀の化学風化と海洋の炭酸塩収支の変化2017

    • Author(s)
      吉村 寿紘、若木 重行、黒田潤一郎、石川 剛志、大河内 直彦
    • Organizer
      日本地球化学会第64回年会
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 海から見える地球表層の元素サイクル2017

    • Author(s)
      吉村 寿紘
    • Organizer
      第12回日本地球化学会ショートコース
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] A Quaternary 88Sr/86Sr record from planktonic foraminifera of Equatrial Pacific sediment2016

    • Author(s)
      Yoshimura, T., Wakaki, S., Kuroda, J., Yamazaki, T., Iwasaki, S., Takagi, H., Kimoto, K., Sakuramoto, Y., Ishikawa, T. and Ohkouchi, N.
    • Organizer
      Goldschmidt 2016
    • Place of Presentation
      横浜市,神奈川県,日本
    • Year and Date
      2016-06-26
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2021-02-19  

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