南部北上山地古生代石灰岩のカドミウム含量

DOI Web Site 参考文献47件
  • 相澤 省一
    群馬大学大学院工学研究科応用化学・生物化学専攻

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タイトル別名
  • Cadmium contents of Paleozoic limestones in South Kitakami Terrane, northeast Japan
  • ナンブ キタカミ サンチ コセイダイ セッカイガン ノ カドミウム ガンリョウ

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抄録

Trace amounts of Cd, Ni and Cu in Permian, Carboniferous and Silurian limestone samples from South Kitakami Terrane were determined by flame atomic absorption spectrophotometry combined with the ammonium pyrrolidinedithiocarbamate (APDC) -4-methyl-2-pentanone solvent extraction system. The geometric means of Cd contents of these limestone samples from Kusayamizawa (n = 9, Silurian), Onimaru (n = 5, Early Carboniferous), Roukando Cave (n = 5, Carboniferous), Nagaiwa Mine (n = 12, Early Permian) and Iwaizaki Coast (n = 12, Middle Permian) were 0.04, 0.31, 0.78, 0.32 and 0.43 ppm, respectively. The Cd contents of Permian and Carboniferous limestones tend to be relatively higher than those of the other geological ages (i.e., before Devonian and after Triassic). Most of the Cd in Permian and Carboniferous limestone samples can be dissolved with 1 mol dm-3 acetic acid, suggesting that a large portion of Cd2+ is incorporated from marine waters into calcite by replacing Ca2+ during the formation and deposition of precursory carbonate minerals of the limestones. The high Cd contents of Permian and Carboniferous limestones are independent of sedimentary environments in the ocean, such as distance from continents, which controls the amounts of land originated detrital materials. This fact implies that the concentration of Cd was high in worldwide throughout the ocean during Parmian and Carboniferous periods.

収録刊行物

  • 地球化学

    地球化学 43 (2), 59-71, 2009

    一般社団法人日本地球化学会

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