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Mineralogical and chemical study on Cretaceous fine-grained sediments

Research Project

Project/Area Number 02640593
Research Category

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

Allocation TypeSingle-year Grants
Research Field 地質学一般
Research InstitutionUniversity of Tokyo

Principal Investigator

UTADA Minoru  University Museum, University of Tokyo, Associated Professor, 総合研究資料館, 助教授 (50012406)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Masaaki  University Museum, University of Tokyo, Research Associated, 総合研究資料館, 助手 (50162714)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsCretaceous sediments / Kwanmon Group / mineralogical composition / purple shale / carbonate cement / chemical composition / 炭酸塩鉱物 / 火砕物 / 成分移動 / 頻度(%)分布パタ-ン / 白亜系関門層群 / 粘土鉱物
Research Abstract

Fine-grained sediments of the Kwanmon Group(Cretaceous)had been studied mineralogically and chemically.
Mineral Composition : Fine-grained sediments are constituted by detrital grains, fine matrix, and cementing materials. The-detrital grain is mainly composed of quartz, feldspars, rhyo-dacitic and andesitic volcanic rocks, and red shale. The matrix is composed of illite, illite/smetite, " chlorite", hematite, goethite and pyrite. Illite-illite/smectite is very common without respect to stratigraphic horizon or rock-type. It is characteristic that the sediments are largely cemented by such carbonate minerals as calcite, dolomite, siderite, and rarely quartz.
Chemical Composition : The Cretaceous sediments have a wide range in chemical composition than basement sediments(Jurassic). The frequency(%)distribution patterns of SiO_2/Al_2O_3 are very similar to those of volcaniclastic sediments, which suggests that the sediments may partly contain volcaniclastic materials. The Fe_2O_3/Al_2O_3 ratios of them, especially pf purple shale, often exceed those of basalt. The frequency(%)distribution patterns of MnO/Al_2O_3, MgO/AL_2O_3 and CaO/Al_2O_3 are very similar to each other. The ratios are discreted into very low and high, which suggests that these elements may have moved in sediments after deposition. The TiO_2 and K_2O ratios to Al_2O_3 are fairly constant without respect to stratigraphic horizon and rock-type.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 歌田 實,清水 正明: "関門層群(白亜紀)の鉱物組成と化学組成の特徴" 岩鉱.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] "Mineralogical and chemical characters of fine-grained sediments of the Kwanmon Group"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 歌田 實・清水 正明: "関門層群(白亜紀)の鉱物組成と化学組成の特徴" 岩鉱.

    • Related Report
      1991 Annual Research Report
  • [Publications] 歌田 実: "白亜紀関門層群の赤色岩" 岩鉱.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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