二次イオン質量分析法とイオン注入法の融合による元素定量分析法の開発

• Project Area: Interaction and Coevolution of the Core and Mantle: Toward Integrated Deep Earth Science
• Project/Area Number: 16H01118
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: 伊藤 正一 京都大学, 理学研究科, 准教授 (60397023)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2017: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2016: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
• Keywords: 水素 / 軽元素 / 二次イオン質量分析法 / 炭素 / 同位体分別 / 分配 / SIMS / 拡散 / 局所同位体分析 / 二次イオン質量分析計 / イオン注入 / 水素定量分析

Outline of Annual Research Achievements

同位体班の佐野博士及び元素分配班のSatish-Kumar博士，技術開発班の桑原博士と密接に連携し，二次イオン質量分析法を用いた高圧合成試料の水素同位体マッピング及び局所水素同位体比測定法の開発や合成ダイヤモンドの局所炭素同位体比測定法の確立，鉄－ケイ酸塩ガラスの炭素分配実験による炭素定量分析手法の開発を行った．その結果，まず第一に，どの高圧合成試料も温度，圧力，保持時間，減圧条件などを見直す必要性があることがわかった。そこで，同位体イメージング法を組み合わせ，高圧合成試料の結晶内の軽元素マッピングを取得する事で目的元素の均一性を評価し，平衡に達したあとの分配をみているのかを定量的に評価した。その結果，高圧実験条件を最適化し，保持時間の違いによる平衡までに達する時間を評価する事に成功した。
また，すべての分析法において，SIMS分析用の試料調整が困難を極めたが，試料研磨方法，試料包埋方法を最適化することに成功した。特に高圧合成試料は結晶サイズも小さく，普通に研磨すると結晶の脱落が容易におきてしまい，鏡面研磨する事が難しい。技術開発班のイオンミリングなどによって切断した試料を用いたり平滑な分析面をえる技術を確立した。
28,29年度に行ってきたオリビンへのイオン注入による標準試料の評価，分析手法の確立にも成功し，相対感度係数など，試料を測定する準備が整った．また，元素分配班のSatish-Kumar博士と共同研究で技術開発班作成のダイヤモンド標準試料（NPD）のSIMSによる高精度炭素同位体比測定の手法の開発を行い，2シグマで1‰程度の再現性で分析することに成功しつつある。
以上より，２年の公募研究の間に，高温高圧実験条件の最適化のためのSIMSイオンイメージング分析手法の確立，試料研磨法及び試料包埋法の確立，高精度同位体測定のためのイオン検出器の最適化に成功した。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Weslayen University(米国)
• [Int'l Joint Research] Wesleyan University(米国)
• [Int'l Joint Research] Natural History Museum London(英国)
• [Journal Article] Evidence for the solar wind in lunar magmas: A study of slowly cooled samples of the Apollo 12 olivine basalt suite (2017)
  • Author(s): Singer J. A., Greenwood J. P., Itoh S., Sakamoto N., and Yurimoto H.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 51 Issue: 1 Pages: 95-104
  • DOI: 10.2343/geochemj.2.0462
  • NAID: 130005317080
  • ISSN: 0016-7002, 1880-5973
  • Year and Date: 2017-01-31
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] H₂O, CO₂, F, S, Cl, and P₂O₅ analyses of silicate glasses using SIMS: Report of volatile standard glasses (2017)
  • Author(s): Shimizu, K., T. Ushikubo, M. Hamada, S. Itoh, Y. Higashi, E. Takahashi, M. Ito
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 51 Issue: 4 Pages: 299-313
  • DOI: 10.2343/geochemj.2.0470
  • NAID: 130005868317
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] The search for and analysis of direct samples of early Solar System aqueous fluids. (2017)
  • Author(s): Zolensky M.E., Bodnar R.J., Yurimoto H., Itoh S., Fries M., Steele A., Chan Q.H.-S., Tsuchiyama A., Kebukawa Y., and Ito M.
  • Journal Title: Philosophical Transactions of the Royal Society A Volume: 375 Issue: 2094 Pages: 20150386-20150386
  • DOI: 10.1098/rsta.2015.0386
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Formation of an ultracarbonaceous Antarctic micrometeorite through minimal aqueous alteration in a small porous icy body (2017)
  • Author(s): Yabuta Hikaru、Noguchi Takaaki、Itoh Shoichi、Nakamura Tomoki、Miyake Akira、Tsujimoto Shinichi、Ohashi Noriaki、Sakamoto Naoya、Hashiguchi Minako、Abe Ken-ichi、Okubo Aya、Kilcoyne A.L. David、Tachibana Shogo、Okazaki Ryuji、Terada Kentaro、Ebihara Mitsuru、Nagahara Hiroko
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 214 Pages: 172-190
  • DOI: 10.1016/j.gca.2017.06.047
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evolution of mineralogy and organic matter during the early stages of aqueous activity recorded in Antarctic micrometeorites. (2017)
  • Author(s): Noguchi T., Yabuta H., Itoh S., Sakamoto N., Mitsunari T., Okubo A., Okazaki R., Nakamura T., Tachibana S., Terada K., Ebihara M., Imae N., Kimura M. and Nagahara H.
  • Journal Title: Geochim Cosmochim Acta Volume: 208 Pages: 119-144
  • DOI: 10.1016/j.gca.2017.03.034
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hydrogen diffusion in the apatite-water system: Fluorapatite parallel to the <i>c</i>-axis (2017)
  • Author(s): Higashi Y., Itoh S., Hashiguchi M., Watanabe K., Sakata S., Hirata T. and Sakaguchi I.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 51 Issue: 1 Pages: 115-122
  • DOI: 10.2343/geochemj.2.0460
  • NAID: 130005317083
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The lunar magma ocean volatile signature recorded in chlorine-rich glasses in KREEP basalts 15382 and 15386 (2017)
  • Author(s): Greenwood J. P., Sakamoto N., Itoh S., Warren H. P., Singer J. A., Yanai K. and Yurimoto H.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 51 Issue: 1 Pages: 105-114
  • DOI: 10.2343/geochemj.2.0453
  • NAID: 130005317107
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Chronological study of oxygen isotope composition for the solar protoplanetary disk recorded in a fluffy Type A CAI from Vigarano (2015)
  • Author(s): Kawasaki N., Itoh S., Sakamoto N., Yurimoto H.
  • Journal Title: Geochim. Cosmochim. Acta Volume: 169 Pages: 99-114
  • DOI: 10.1016/j.gca.2015.12.031
  • Peer Reviewed / Open Access
• [Presentation] Development for hydrogen diffusion experiments under Ar/D2 and D2O condition (2017)
  • Author(s): 伊藤 正一、東 佳徳、青木 亮、坂口 勲
  • Organizer: JPGU-AGU joint meeting 2017
  • Int'l Joint Research
• [Presentation] マイクロX線CT・FIBシリアルセクショニングを用いたIvuna隕石のマトリクスの3次元構造観察 (2017)
  • Author(s): 北山 晃、土山 明、三宅 亮、中野 司、上杉 健太朗、竹内 晃久、高山 亜紀子、伊藤 正一
  • Organizer: JPGU-AGU joint meeting 2017
  • Int'l Joint Research
• [Presentation] 水蒸気雰囲気下におけるフッ素アパタイトの水素拡散実験 (2017)
  • Author(s): 東 佳徳、伊藤 正一、渡邊 賢、坂口 勲
  • Organizer: JPGU-AGU joint meeting 2017
  • Int'l Joint Research
• [Presentation] Origin of Extremely Deutrium-Rich Isotopic Compositions of Phosphates from LL4-6 Ordinary Chondrites (2016)
  • Author(s): Itoh S., Higashi Y, Hashiguchi M, Sakaguchi I, Yanai K, Russell S, Greenwood J, Sakata S, Hirata T & Yurimoto H.
  • Organizer: Goldschmidt Yokohama 2016
  • Place of Presentation: 神奈川横浜
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] Early Cometary Delivery of Water to the Inner Solar System: Clues from the Moon and Mars (2016)
  • Author(s): Greenwood J, Itoh S, Sakamoto N & Yurimoto H
  • Organizer: Goldschmidt Yokohama 2016
  • Place of Presentation: 神奈川横浜
  • Year and Date: 2016-06-26
  • Int'l Joint Research / Invited
• [Presentation] Hydrogen diffusion experiment of apatite: Effects of different water content (2016)
  • Author(s): Y. Higashi, S. Itoh, K. Watanabe, I. Sakaguchi
  • Organizer: Goldschmidt Yokohama 2016
  • Place of Presentation: 神奈川横浜
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] Petrography of a unique type A CAI evolved by multiple heating (2016)
  • Author(s): S. Yoneyama, T. Hirata and S. Itoh
  • Organizer: Goldschmidt Yokohama 2016
  • Place of Presentation: 神奈川横浜
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] Hydrogen diffusion experiment in apatite: Effects of different water content (2016)
  • Author(s): Y. Higashi, S. Itoh, K. Watanabe, I. Sakaguchi
  • Organizer: Japan Geoscience Union MEETING 2016
  • Place of Presentation: 千葉幕張メッセ
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] Petrography of a Type A CAI evolved by multiple heating (2016)
  • Author(s): S. Yoneyama and S. Itoh
  • Organizer: Japan Geoscience Union MEETING 2016
  • Place of Presentation: 千葉幕張メッセ
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] Secular change of oxygen isotope composition in the solar protoplanetary disk recorded in a fluffy Type A CAI from Vigarano CV3 by Al-Mg chronological study (2016)
  • Author(s): Kawasaki, S. Itoh, N. Sakamoto, H. Yurimoto
  • Organizer: Japan Geoscience Union MEETING 2016
  • Place of Presentation: 千葉幕張
  • Year and Date: 2016-05-22
  • Int'l Joint Research