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The study of Geochemical Processes in the trench Environment using trace constituent and isotopic techniques.

Research Project

Project/Area Number 07404051
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionThe University of Tokyo

Principal Investigator

NOZAKI Yoshiyuki  The University of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (70126142)

Co-Investigator(Kenkyū-buntansha) AMAKAWA Hiroshi  The University of Tokyo, Ocean Research Institute, Research Associate, 海洋研究所, 助手 (60260519)
ISHIZUKA Toshio  The University of Tokyo, Ocean Research Institute, Research Associate, 海洋研究所, 助手 (80107458)
GAMO Toshitaka  The University of Tokyo, Ocean Research Institute, Assistant Professor, 海洋研究所, 助教授 (70143550)
児玉 幸雄  東京大学, 海洋研究所, 助手 (10013575)
Project Period (FY) 1995 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1998: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsGeochemical cycle / Mass spectrometry / Japan Trench / Izu-Ogasawara Trench / Sediment trap / Indium / Rare earth elements / 伊豆小笠原海溝
Research Abstract

The purpose of this study is to understand geochemical processes in super-deep trench environment, such as the Japan and Izu-Ogasawara trenches.
Trenches exhibit characteristic topographic features of V shaped valley exceeding 7000 m depth, and are important zone for subduction of sedimentary materials. Similarly to isolated basins, the oceanographic environment inside trenches is considered to be different from that of typical ocean floor. However, systematic investigations of oceanography and geochemistry of the trench environment are few to date and largely remains "untouched". We have investigated by collecting samples of seawater, sediments and particulate matter from the deepest parts of the Japan and Izu-Ogasawara trenches for various analysis. For comparison, we have also carried out geochemical study in the Indian Ocean including the Sulu Sea, South China Sea and Andaman Sea. This year, we have further extended our research to the Japan Trench, Sea of Okhotsk and the Japan Sea and published a final report.
Summary of the outcomes are ;
1) We obtained the data on the vertical distributions of natural and man-made radionuclides and some heavy metals throughout the water column of the Japan and Izu-Ogasawara trenches for the first time, and published a paper in Oceanologica Acta,
2) We published the results and their implications of rare earth elements in particulate matter collected by sediment trap in the Japan Trench in Earth and Planetary Science Letters,
3) We continued to work on dissolved rare earth elements and In using ICP mass spectrometry and published the results and their implications in two papers in Geochimica et Cosmochimica Acta,
4) We have obtained the data on Nd isotopes in surface seawater which can be interpreted by different sources, water circulation. The results will be published shortly.
We hope that these results will stimulate further systematic and comprehensive study in near future.

Report

(5 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Jing,Zhang: "Behavior of rare earth elements in seawater at the ocean margin : A study along the slopes of the Sagami and Nankai troughs near Japan." Geochimica et Cosmochimica Acta. 62(8). 1307-1317 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dorte,Lerche: "Rare earth elements of sinking particulate matter in the Japan Trench" Earth and Planetary Science Letters. 159. 71-86 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshiyuki,Nozaki: "Distribution of Ra isotopes and the ^<210>Pb and ^<210>Po balance in surface seawaters of the mid Northern Hemisphere." Deep-Sea Research I. 45. 1263-1284 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshiyuki,Nozaki: "The distribution of radionuclides and some trace metals in the water columns of the Japan and Bonin trenches." Oceanologica Acta. 21. 469-484 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dia Sotto Alibo: "Determination of indium in natural waters by flow injection inductively coupled plasma mass spectrometry." Anal.Chem.(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dia Sotto Alibo: "Rare earth elements in seawater : Particle association,shale-normalization,and Ce oxidation" Geochim.Cosmochim.Acta.(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 野崎 義行: "海洋のしくみ" 日本実業出版社, 170 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Jing, Zhang: "Behavior of rare earth elements in seawater at the ocean margin : a study along the slopes of the Sagami and Nankai troughs near Japan." Geochimica et Cosmochimica Acta. 62 (8). 1307-1317 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dorte, Lerche: "Rare earth elements of sinking particulate matter in the Japan Trench." Earth and Planetary Science Letters. 159. 71-86 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshiyuki, Nozaki: "Distribution of ra isotopes and the ^<210>Pb and ^<210>Po balance in surface seawaters of the mid Northern Hemisphere." Deep-Sea Research I. 45. 1263-1284 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshyuki, Nozaki: "the distribution of radionuclides and some trace metals in the water columns of the Japan and bonin trenches." Oceanologica acta. 21. 469-484 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dia Sotto Alibo: "Determination of indium in natural waters by flow injection inductively coupled plasma mass spectrometry." Anal.Chem. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Dia Sotto Alibo: "Rare earth elements in searwater : Particle association, shale-normalization, and Ce oxidation" Geochim.Cosmochim.Acta. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Jing, Zhang: "Behavior of rare earth elements in seawater at the ocean margin : A study along the slopes of the Sagami and Nankai troughs near Japan." Geochimica et Cosmochimica Acta. 62 (8). 1307-1317 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Dorte, Lerche: "Rare earth elements of sinking particulate matter in the Japan Trench" Earth and Planetary Science Letters. 159. 71-86 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yoshiyuki, Nozaki: "Distribution of Ra isotopes and the ^<210>Pb and ^<210>Po balance in surface seawater of the mid Northern Hemisphere." Deep-Sea Research I. 45. 1263-1284 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yoshiyuki, Nozaki: "The distribution of radionuclides and some trace metals in the water columns of the Japan and Bonin trenches." Oceanologica Acta. 21. 469-484 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Dia Sotto Alibo: "Determination of indium in natural waters by flow injection inductively coupled plasma mass spectrometry." Anal.Chem.((in press))

    • Related Report
      1998 Annual Research Report
  • [Publications] Dia Sotto Alibo: "Rare earth elements in seawater : Particle association, shale-normalization, and Ce oxidation," Geochim.Cosmochim.Acta.((in press))

    • Related Report
      1998 Annual Research Report
  • [Publications] 野崎 義行: "海洋のしくみ" 日本実業出版社, 170 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Nozaki et al.: "The distribution of radionuclides and some trace metals in the water columns of the Japan and Bonin trenches." Oceanologica Acta.in press.

    • Related Report
      1997 Annual Research Report
  • [Publications] Zhang.J.et al.: "Behavior of rare earth elements in seawater at the ocean margin : a study along the slopes of Sagami and Nankai Troughs near Japan." Geochim.Cosmochim.Acta.in press.

    • Related Report
      1997 Annual Research Report
  • [Publications] Lerche,D.et al.: "Rare earth elements of sinking particulate matter in the Japan Trench." Earth Planet.Sci.Lett.in press.

    • Related Report
      1997 Annual Research Report
  • [Publications] Amakawa,H.D.S.Alibo and Y.Nozaki: "Indium concentrations in Pacific seawater" Geophys.Res.Lett.23. 2473-2476 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 野崎 義行: "Chemical and radiochemical investigation of sediment cores from the 9750 m bottom of the Bonin Trench." Mar.Technol Soc.Jour.29. 32-41 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 野崎 義行: "現代海洋化学の展望。" 月刊海洋. 号外8. 5-12 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 野崎 義行: "海水中の希土類元素の地球化学" 月刊海洋. 号外8. 30-36 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 野崎 義行: "陸起源物質のオーシャンフラックスの寄与" 学術月報. 48. 564-568 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 野崎 義行: "気候システムと気候変動" 太陽エネルギー. 21. 9-14 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 酒井 均: "Biogeochemical Prosesses and Ocean Flux in the Western Pacific." Terra学術図書出版, 672 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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