Elucidating the Origin of the "Fifth Submarine Mineral Resource" by Re-Os Analysis and Statistical Analysis

• Project/Area Number: 20K22333
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Chiba Institute of Technology
• Principal Investigator: Yano Moei 千葉工業大学, 次世代海洋資源研究センター, 主任研究員 (30880281)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 黒色頁岩 / 黒色泥 / 海底鉱物資源 / Re-Os分析 / 多変量解析 / 多変量統計解析 / レアメタル / 酸化還元鋭敏元素

Outline of Research at the Start

本研究は，貧酸素環境における堆積物へのレアメタル元素の濃集メカニズムを，地球化学データセットの多変量統計解析と同位体分析に基づき解明することを目的とする．本研究では，レアメタル濃集メカニズムの解明の鍵になると考えられるレニウム (Re)・オスミウム (Os) について，従来よりも効率的な分析手法を確立し，海底堆積物を対象にReを含む高次元地球化学データセットの統計解析とOs同位体比分析を行うことで，貧酸素環境においてレアメタル元素濃集をもたらす物質やプロセス，環境条件を考察する．

Outline of Final Research Achievements

I examined the appropriate acid decomposition conditions for simple Rhenium-Osmium (Re-Os) analysis using multicollector inductively coupled plasma mass spectrometry, and revealed that it is necessary to consider the acid used for the decomposition according to the Total Organic Carbon (TOC) of the sample. I conducted Re-Os analysis of sediments from the Cariaco Basin, where anoxic water masses develop, and investigated the relationship between Re concentration, Re concentration and TOC, suggesting that adsorption on organic matter is an important mechanism for Re accumulation in these sediments. Independent component analysis was performed on the chemical composition data set of black muds and black shales, and eight independent components were extracted. Among them, three components were interpreted as redox-related.

Academic Significance and Societal Importance of the Research Achievements

本研究では，有機物に富む堆積物のRe-Os分析について，酸分解に用いる酸の量と種類を変えて実験を行った．本研究で得られたデータは黒色泥，黒色頁岩のRe-Os分析を行う上で重要であるため，学術的意義が大きいと考えられる．
また，従来の黒色泥・黒色頁岩の化学組成データセットについて独立成分分析を行い，抽出された8つの成分のうち，3つを酸化還元鋭敏元素の濃集に関するものであると解釈した．これは資源生成に関わるレアメタル元素濃集のメカニズム解明のために重要な情報であり，社会的意義のある成果が得られたと考えられる．

Research Products

• [Journal Article] Umber as a lithified REY-rich mud in Japanese accretionary complexes and its implications for the osmium isotopic composition of Middle Cretaceous seawater (2022)
  • Author(s): Koichiro Fujinaga, Kentaro Nakamura, Junichiro Ohta, Moei Yano, Yusuke Kuwahara, Kazutaka Yasukawa, Yutaro Takaya, Ken Nakayama, Tatsuo Nozaki, Yasuhiro Kato
  • Journal Title: Ore Geology Reviews Volume: 142 Pages: 104683-104683
  • DOI: 10.1016/j.oregeorev.2021.104683
  • Peer Reviewed / Open Access
• [Journal Article] Statistical independence of black shales in Phanerozoic oxygen-depleted marine environments (2022)
  • Author(s): Moei Yano, Kazutaka Yasukawa, Kentaro Nakamura, Junichiro Kuroda, Minoru Ikehara, Hikaru Iwamori, Yasuhiro Kato
  • Journal Title: Science Advances Volume: -
  • Peer Reviewed
• [Journal Article] Re-Os geochemistry of Early Permian seawater reconstructed from the umber deposit in the Japanese accretionary complex (2022)
  • Author(s): Moei Yano, Kazutaka Yasukawa, Tatsuo Nozaki, Koichiro Fujinaga, Junichiro Ohta, Kentaro Nakamura, Yasuhiro Kato
  • Journal Title: Ore Geology Reviews Volume: -
  • Peer Reviewed
• [Journal Article] Iron deposition during recovery from Late Devonian oceanic anoxia: Implications of the geochemistry of the Kawame ferromanganese deposit, Nedamo Belt, northeast Japan (2022)
  • Author(s): Yusuke Kuwahara, Koichiro Fujinaga, Tatsuo Nozaki, Junichiro Ohta, Moei Yano, Kazutaka Yasukawa, Kentaro Nakamura, Yasuhiro Kato
  • Journal Title: Global and Planetary Change Volume: -
  • Peer Reviewed
• [Journal Article] The age and origin of the Ruwai polymetallic skarn deposit, Central Borneo, Indonesia (2022)
  • Author(s): Cendi D. P. Dana, Andrea Agangi, Arifudin Idrus, Cyril Chelle-Michou, Marcel Guillong, Mizuki Ishida, Chun-Kit Lai, Ryohei Takahashi, Moei Yano, Kazuhide Mimura, Junichiro Ohta, Yasuhiro Kato, Doly R. Simbolon
  • Journal Title: Economic Geology Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of the simple and rapid Re-Os isotope analytical method for organic-rich sediments (2022)
  • Author(s): Moei Yano, Junichiro Ohta, Tatsuo Nozaki, Yasuhiro Kato
  • Journal Title: Geostandards and Geoanalytical Research Volume: -
  • Peer Reviewed
• [Presentation] 高知県国見山アンバーから復元したペルム紀前期の海水Os同位体組成 (2022)
  • Author(s): 矢野 萌生，大田 隼一郎，藤永 公一郎，安川 和孝，中村 謙太郎，加藤 泰浩
  • Organizer: JpGU Meeting 2022
• [Presentation] 東北日本の小坂・尾去沢・細倉鉱床から産出した硫化鉱物のRe-Os同位体 組成の特徴とその放射年代決定に対する示唆 (2022)
  • Author(s): 小笠原 瑞姫，大田 隼一郎，石田 美月，矢野 萌生，藤永 公一郎，安川 和孝，中村 謙太郎，加藤 泰浩
  • Organizer: JpGU Meeting 2022
• [Presentation] High-resolution geochemical and osmium isotopic record across lithologic boundaries of the pelagic clay around Minamitorishima Island in the western North Pacific Ocean (2022)
  • Author(s): Haruhito Takuma, Kazuhide Mimura, Moei Yano, Junichiro Ohta, Koichiro Fujinaga, Kazutaka Yasukawa, Kentaro Nakamura, Yasuhiro Kato
  • Organizer: JpGU Meeting 2022
• [Presentation] Chemical weathering and volcanism during the early Paleogene hothouse constrained from the marine osmium isotope record in the central North Pacific Ocean (2022)
  • Author(s): Kakeru Ikegami, Kazutaka Yasukawa, Erika Tanaka, Junichiro Ohta, Yusuke Kuwahara, Moei Yano, Koichiro Fujinaga, Kentaro Nakamura, Yasuhiro Kato
  • Organizer: JpGU Meeting 2022
• [Presentation] 有機物に富む堆積物試料の簡便かつ迅速なRe-Os同位体分析手法の開発 (2021)
  • Author(s): 矢野 萌生，大田 隼一郎，野崎 達生，加藤 泰浩
  • Organizer: 日本地質学会128年学術大会
• [Presentation] 日本列島付加体中のレアアース泥：安芸アンバー鉱床から復元した中期白亜紀の海水Os同位体組成 (2021)
  • Author(s): 藤永公一郎，中村謙太郎，大田隼一郎，矢野萌生，桑原佑典，安川和孝，高谷雄太郎，中山健，野崎達生，加藤泰浩
  • Organizer: 日本地質学会第128年学術大会
• [Presentation] Os同位体分析に基づく古第三紀超温暖化イベントにおける化学風化フィードバックの考察 (2021)
  • Author(s): 池上翔，安川和孝，田中えりか，大田隼一郎，桑原佑典，矢野萌生，藤永公一郎，加藤泰浩
  • Organizer: JpGU Meeting 2021
• [Presentation] Os同位体比層序に基づく南鳥島周辺深海堆積物の複数のレアアース濃度ピークの堆積年代 (2021)
  • Author(s): 小田裕太，大田隼一郎，田中えりか，安川和孝，桑原佑典，矢野萌生，藤永公一郎，中村謙太郎，加藤泰浩
  • Organizer: JpGU Meeting 2021
• [Presentation] MC-ICP-MSと気化法による硫化物の迅速Re-Os同位体測定手法: 東北日本釜石鉱床への適用 (2021)
  • Author(s): 小笠原瑞姫，大田隼一郎，石田美月，矢野萌生，牧亮太，野崎達生，高谷雄太郎，藤永公一郎，安川和孝，加藤泰浩
  • Organizer: JpGU Meeting 2021
• [Presentation] 早池峰帯川目鉄マンガン鉱床の地球化学 ―デボン紀後期海洋環境への示唆－ (2021)
  • Author(s): 桑原佑典，藤永公一郎，野崎達生，大田隼一郎，矢野萌生，安川和孝，中村謙太郎，加藤泰浩
  • Organizer: JpGU Meeting 2021
• [Presentation] オスミウム同位体比層序に基づく南鳥島周辺深海堆積物の第2レアアース濃度ピークの堆積年代 (2021)
  • Author(s): 小田裕太，大田隼一郎，田中えりか，安川和孝，桑原佑典，矢野萌生，藤永公一郎，中村謙太郎，加藤泰浩
  • Organizer: 第37回希土類討論会
• [Presentation] An improved analytical method for Re-Os isotope analysis and its application to GSJ geochemical reference materials, JCu-1 and JZn-1 (2021)
  • Author(s): Ogasawara, M., Ohta, J., Ishida, M., Yano, M., Yasukawa, K., Kato, Y.
  • Organizer: European Geoscience Union General Assembly 2021
  • Int'l Joint Research
• [Presentation] A simple and efficient method for Re-Os isotope analysis of sulfides using MC-ICP-MS (2021)
  • Author(s): Ogasawara, M., Ohta, J., Ishida, M., Yano, M., Yasukawa, K., Kato, Y.
  • Organizer: 12th Annual PDAC-SEG Student Minerals Colloquium
  • Int'l Joint Research