Utility of stable isotope system of tungsten as a paleocean redox proxy based on molecular structure

• Project/Area Number: 23840058
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: KASHIWABARA Teruhiko 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, ポストドクトラル研究員 (70611515)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: タングステン / X-ray Absorption Fine Structure (XAFS) / 蛍光分光 / 同位体分別 / 鉄マンガン酸化物 / XAFS / 同位体

Research Abstract

Adsorption on marine ferromanganese oxides is the important process controlling concentration and isotopic composition of tungsten (W) in modern oxic seawater. We focused on the enrichment and isotopic fractionation of W onto ferromanganese oxides by both structural analysis and isotope measurements. We revealed that W changes its molecular symmetry through inner-sphere complexation on the surface of both Fe (oxyhydr)oxides and Mn oxides, and also shows isotopic fractionation.

Research Products

• [Journal Article] Tungsten species in natural ferromanganese oxides related to its different behavior in oxic ocean from molybdenum. (2013)
  • Author(s): T. Kashiwabara, Y. Takahashi, M. A. Marcus, T, Uruga, H. Tanida, Y. Terada, and A. Usui
  • Journal Title: Geochim. Cosmochim. Acta Volume: 106 Pages: 364-378
  • DOI: 10.1016/j.gca.2012.12.026
  • Peer Reviewed
• [Journal Article] Prokaryotic abundance and community composition in a freshwater iron-rich microbial mat at circumneutral pH. (2012)
  • Author(s): Kato S.
  • Journal Title: Geomicrobiology Journal. Volume: 29(10) Issue: 10 Pages: 896-905
  • DOI: 10.1080/01490451.2011.635763
  • Peer Reviewed
• [Journal Article] Molecular-scale mechanisms of distribution and isotopic fractionation of molybdenum between seawater and ferromanganese oxides (2011)
  • Author(s): T.Kashiwabara, Y.Takahashi, et al
  • Journal Title: Geochim.Cosmochim.Acta Volume: 75 Issue: 19 Pages: 5762-5784
  • DOI: 10.1016/j.gca.2011.07.022
  • Peer Reviewed
• [Presentation] XAFS法及び分子軌道法を用いたクロム酸・モリブデン酸・タングステン酸の鉄水酸化物に対する反応性の比較 (2012)
  • Author(s): 有賀大輔,田中雅人,柏原輝彦,高橋嘉夫
  • Organizer: 2012年度日本地球化学第59回会年会
  • Place of Presentation: 九州大学
  • Year and Date: 2012-09-12
• [Presentation] 鉄マンガン酸化物へのテルルの"異常濃集"の化学的要因 (2012)
  • Author(s): 大石泰子, 柏原輝彦, 杉山敏基, 坂口綾, 高橋嘉夫
  • Organizer: 2012年度日本地球化学第59回会年会
  • Place of Presentation: 九州大学
  • Year and Date: 2012-09-12
• [Presentation] Mechanisms of isotopic fractionation of Mo on ferromanganese oxides based on the systematic analysis of surface complex structures (2012)
  • Author(s): T. Kashiwabara, Y. Takahashi
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Montreal, Canada
  • Year and Date: 2012-06-26
• [Presentation] 表面錯体構造の比較に基づく鉄マンガン酸化物への吸着におけるモリブデン同位体分別機構の解明 (2011)
  • Author(s): 柏原輝彦, 高橋嘉夫
  • Organizer: 2011年度日本地球化学第58回会年会
  • Place of Presentation: 北海道大学
  • Year and Date: 2011-09-16
• [Presentation] Molecular-scale mechanism of Mo isotopic fractionation during adsorption on ferromanganese oxides (2011)
  • Author(s): T. Kashiwabara, Y. Takahashi
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Prague Congress Centre, チェコ共和国
  • Year and Date: 2011-08-18
• [Presentation] Molecular-scale mechanism of Mo isotopic fractionation during adsorption on ferromanganese oxides (2011)
  • Author(s): Teruhiko Kashiwabara, Yoshio Takahashi
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Prague Congress Centre
  • Year and Date: 2011-08-18
• [Presentation] Speciation of Tungsten in Natural Ferromanganese Oxides Using Wavelength Dispersive XAFS (2011)
  • Author(s): T. Kashiwabara, Y. Takahashi
  • Organizer: ICAS2011
  • Place of Presentation: 京都大学
  • Year and Date: 2011-05-25
• [Presentation] 表面錯体構造の比較解析に基づく鉄マンガン酸化物への吸着に伴うモリブデンの同位体分別機構の解明 (2011)
  • Author(s): 柏原輝彦, 高橋嘉夫
  • Organizer: 地球惑星科学連合2011年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2011-05-23
• [Presentation] 鉄マンガン酸化物へのテルルの“異常濃集”の化学的要因
  • Author(s): 柏原輝彦
  • Organizer: 2012年度日本地球化学第59回会年会
  • Place of Presentation: 九州大学
• [Presentation] XAFS法及び分子軌道法を用いたクロム酸・モリブデン酸・タングステン酸の鉄水酸化物に対する反応性の比較
  • Author(s): 有賀大輔
  • Organizer: 2012年度日本地球化学第59回会年会
  • Place of Presentation: 九州大学
• [Patent(Industrial Property Rights)] 海底熱水鉱物資源の回収方法及び回収システム (2012)
  • Inventor(s): 高井研、猿橋具和、宮崎純一、澤田郁郎、渋谷岳造、川口慎介、石橋純一郎、野崎達生、柏原輝彦、中村謙太郎、鈴木勝彦
  • Industrial Property Rights Holder: 独立行政法人海洋研究開発機構
  • Industrial Property Number: 2012-026705
  • Filing Date: 2012-02-09