レアアース泥の起源:独立成分分析による数理統計的アプローチを中心に  [in Japanese] Genesis of REY-rich mud: A new perspective based on independent component analysis  [in Japanese]

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Author(s)

    • 安川 和孝 Yasukawa Kazutaka
    • 東京大学大学院工学系研究科システム創成学専攻|千葉工業大学次世代海洋資源研究センター Department of Systems Innovation, School of Engineering, The University of Tokyo|Ocean Resources Research Center for Next Generation, Chiba Institute of Technology
    • 中村 謙太郎 Nakamura Kentaro
    • 東京大学大学院工学系研究科システム創成学専攻 Department of Systems Innovation, School of Engineering, The University of Tokyo
    • 藤永 公一郎 Fujinaga Koichiro
    • 千葉工業大学次世代海洋資源研究センター|東京大学大学院工学系研究科エネルギー・資源フロンティアセンター Ocean Resources Research Center for Next Generation, Chiba Institute of Technology|Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo
    • 岩森 光 Iwamori Hikaru
    • 海洋研究開発機構地球内部物質循環研究分野|東京工業大学地球惑星科学専攻 Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology|Department of Earth and Planetary Sciences, Tokyo Institute of Technology
    • 加藤 泰浩 Kato Yasuhiro
    • 東京大学大学院工学系研究科システム創成学専攻|千葉工業大学次世代海洋資源研究センター|東京大学大学院工学系研究科エネルギー・資源フロンティアセンター|海洋研究開発機構海底資源研究開発センター Department of Systems Innovation, School of Engineering, The University of Tokyo|Ocean Resources Research Center for Next Generation, Chiba Institute of Technology|Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo|Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology

Abstract

<p>Since the discovery of rare-earth elements and yttrium (REY)-rich mud in the Pacific Ocean, a variety of research has been conducted to understand its spatial distribution and genesis. In this paper, we review the latest research outcomes on REY-rich mud, including the discovery of "extremely REY-rich mud" containing >5,000 ppm of total REY, a promising deep-sea mineral resource in Japan's exclusive economic zone surrounding Minamitorishima Island. Then, we introduce a new statistical approach based on independent component analysis (ICA) to clarify the origin of REY-rich mud in the Pacific and Indian oceans, with a theoretical background and a protocol of ICA application on geochemical data. Independent components extracted from a multi-elemental dataset of ~4,000 samples demonstrate distinctive geochemical features, and their spatiotemporal distributions indicate that the sedimentation rate is an underlying key factor for REY-enrichment. We also refer to an important link between the genesis of REY-rich mud and Earth system dynamics. Finally, we focus on some challenges to be overcome. One of the most significant questions concerns the formation mechanism of the extremely REY-rich mud. An important key to this question is the depositional age of the extraordinary sediment layer.</p>

Journal

  • Chikyukagaku

    Chikyukagaku 52(4), 171-210, 2018

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    130007550670
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    029426183
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  J-STAGE 
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