元素存在度比の解析による珪質堆積岩の堆積古環境の研究 (1995年度日本地球化学会奨励賞受賞記念論文)  [in Japanese] Study of sedimentary paleoenvironments of siliceous sedimentary rocks using some geochemical indicators  [in Japanese]

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Author(s)

    • 杉谷 健一郎 SUGITANI Kenichiro
    • 名古屋大学情報文化学部自然情報学科 Department of Natural Science Informatics, School of Informatics and Sciences, Nagoya University

Abstract

Geochemical indicators for origins and sedimentary environments of marine sediments and siliceous sedimentary rocks are reviewed. Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> and Zr/TiO<sub>2</sub> values are useful indicators for sources of detrital materials in sediments, because these values in igneous rocks change systematically (acidic > intermediate > mafic). MnO/TiO<sub>2</sub> and Co/TiO<sub>2</sub> values and Co-Ni-Zn diagram, on the other hand, are useful for discrimination between pelagic sediments and hemipelagic ones. Pelagic sediments deposited under oxic environment are characterized by high MnO/TiO<sub>2</sub> and Co/TiO<sub>2</sub> values and enrichment of Co and Ni relative to Zn, compared with hemipelagic sedmiments. In addition to these indicators, stratigraphic variation of MnO and CO<sub>2</sub> (derived from carbonate minerals) concentrations can discriminate between pelagic sediments and hemipelagic ones. In hemipelagic sediments where diagenetic remobilization of manganese is active, MnO and CO<sub>2</sub> concentrations often show covariation and manganese carbonate bands (rhodochrosite-concentrated layers) are found at depths. It should be also noted that these geochemical indicators are, in some cases, modified by diagenesis and subaerial alteration. Careful application of these indicators to analyses of sedimentary paleoenvironments is required.

Journal

  • Chikyukagaku

    Chikyukagaku 30(2), 75-89, 1996

    The Geochemical Society of Japan

References:  54

Cited by:  2

Codes

  • NII Article ID (NAID)
    110008679914
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    4066439
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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