Geochemical study of rare earth elements in carbonate minerals in sedimentary rocks around Tono uranium deposit, central Japan –An example of natural analogue study of geological disposal of high-level nuclear waste–

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  • DOBASHI Ryuta
    Department of Applied Chemistry, Faculty of Science and Technology, Keio University
  • SHIKAZONO Naotatsu
    Department of Applied Chemistry, Faculty of Science and Technology, Keio University

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Other Title
  • 東濃ウラン鉱床周辺堆積岩中炭酸塩鉱物の希土類元素に関する地球化学的研究 –高レベル放射性廃棄物地層処分に関するナチュラルアナログ研究の例–
  • トウノウ ウラン コウショウ シュウヘン タイセキガンチュウ タンサンエン コウブツ ノ キドルイ ゲンソ ニ カンスル チキュウ カガクテキ ケンキュウ コウレベル ホウシャセイ ハイキブツ チソウ ショブン ニ カンスル ナチュラル アナログ ケンキュウ ノ レイ

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Abstract

Carbonate minerals are ones of the most ubiquitous authigenic minerals in the sedimentary rocks. Therefore, we studied these minerals in order to clarify the retardation effect of radioactive elements, Am and Cm due to the incorporation of rare earth elements into carbonates. The light rare earth element concentrations of carbonates in the sedimentary rocks in Tono uranium mine area, central Japan, are high compared to those of the bulk rock. Since light rare earth elements are chemical analogues to Am and Cm, it is likely that carbonates easily incorporate them. Therefore, it is expected that incorporation of Am and Cm into carbonates can retard long-term migration of these elements. Calculations of the partitioning of rare earth elements between carbonates and groundwater suggest that the ionic radius and charge influence significantly the incorporation of Am and Cm into carbonates under actual underground geological environment.

Journal

  • Chikyukagaku

    Chikyukagaku 42 (3), 79-98, 2008

    The Geochemical Society of Japan

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