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Field measurements of weathering rates of bedrocks under erosional terrace surfaces

Research Project

Project/Area Number 03680213
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionCHUO UNIVERSITY

Principal Investigator

SUZUKI Takasuke  Chuo Univ., Fac.Sci.&Eng., Professor, 理工学部, 教授 (60055168)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsWeathering rate / Terrace / Geomorphology / Chichibu basin / Boso peninsula / Japan / Tertiary rocks / 第三紀堆積岩 / 弾性波探査 / 第三系 / 河岸段丘
Research Abstract

The aim is to establish the empirical equations to express the rates of weathering of bedrocks defined as dZ/dt, where Z is the thickness of weathered materials in the direction perpendicular to ground surface and t is the time elapsed since the surface of fresh bedrock was last eroded. The data were obtained for the weathered materials of bedrocks under the dated fluvial and marine erosional terrace surfaces arount Tokyo, Japan. The studied terraces are 1)divided into the 21 sequential series ranging from 70 to 70,000 yr.B.P.in the age assumed to be equal to the time t, 2)composed of the Tertiary sedimentary rocks, and 3) covered with gravels or sand veneer ranging from 0.2 to 3 m thick.
The weathering profiles were investigated at 56 sites on 14 series of the terraces with the combined methods of test pits, borings and seismic prospectings, and were divided into four weathering zones different in weathering grades : highly weatheredzone (H), moderately (M), slightly (S) and faintly (F). The boundaries between the four zones were confirmed by the differences in the pore-size distribution and penetration hardness. The thickness of weathered materials from the base of terrace veneer to each base of the four zones are denoted as Z_H, Z_M, Z_S and Z_F, respectively.
The relationships between these Z's and t are expressed as Z=alphat^<beta>, where alpha and beta are constatns. The values of slpha are 0.48, 1.2 and 3.2 mm/yr for Z_H, Z_M and Z_S, respectively, whereas beta shows an almost uniform value of 0..75 for the three different zones. This fact indicates that the weathering rates, dZ/dt, decrease with the time t.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 鈴木隆介 鶴飼貴昭 佐原圭介 八戸昭一: "弾性波探査に基づく秩父盆地第三系の風化速度" 地形. 13. 70 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木隆介 八戸昭一 清水伸晴: "房総半島野島崎付近の海成段丘面下における基盤岩石の風化速度" 地形. 14. 87 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木隆介 八戸昭一 清水伸晴: "房総半島野島崎付近の海成段丘面下における基盤岩石の風化速度(第2報)" 地形〔日本地形学連合1993年度春季大会で3月31日に発表予定). 15. 344 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] SUZUKI,T.and HACHINOHE.S.: "Weathering rates of bedrocks under erosional terrace surjaces in Japan" Proceedings of 3rd International Conjerence on Geomorphology:Hamilton,CANADA. 256 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木隆介 八戸昭一 平木伸明: "風化速度に与える原岩物性の影響" 地形. 15. 73 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木隆介 清水伸晴 平木伸明 八戸昭一: "間隙径分布に基づく風化指標" 地形. 15. 73 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takasuke Suzuki: "Weathering rates of Tertiary strata under the dated fluvial bedrock-terrace surfaces in the Chichibu Basin, Japan, using seismic prospecting data." Transactions, Japanese Geomorphological Union. Vol.13. 70 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takasuke Suzuki: "Weathering rates of bedrocks under the marine-terrace surfaces around Nojimazaki, Boso Peninsula." Transactions, Japanese Geomorphological Union. Vol.14. 87 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takasuke Suzuki: "Weathering rates of bedrocks under the marine-terrace surfaces around Nojimazaki, Boso Peninsula (Second report)." Transactions, Japanese Geomorphological Union. Vol.15 (in press). (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takasuke Suzuki: "Weathering rates of bedrocks under erosional terrace surfaces in Japan." Proceedings of the 3rd International conference on Geomorphology. (in press). (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木 隆介: "弾性波探査に基づく秩父盆地第三系の風化速度" 地形. 13. 70- (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 鈴木 隆介: "房総半島野島崎付近の海成段丘面下における基盤岩石の風化速度" 地形. 14. 87- (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 鈴木 隆介: "房総半島野島崎付近の海成段丘面下における基盤岩石の風化速度(第2報)" 地形(日本地形学連合1993年度春季大会). 15. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Suzuki,TAKASUKE(鈴木 隆介): "Weathering rates of bedrocks under erosional terrace surdaces in Japan" Pruceedings of the 3rol International Conference on Geomorohology(on 24Ang.1983,in Hamilton,CANADA). (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 鈴木 隆介,鶴飼 貴昭,佐原 圭介,八戸 昭一: "弾性波探査に基づく秩父盆地三系の風化速度" 地形. 13. 70 (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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