氷衛星内部海水の高圧下における粘度測定と内部海進化モデルの構築

• Project Area: Aqua planetology
• Project/Area Number: 20H04604
• 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: Tohoku University
• Principal Investigator: 鈴木 昭夫 東北大学, 理学研究科, 准教授 (20281975)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 衛星内部海 / 氷火山 / 塩水溶液 / 高圧力 / 粘度 / 氷衛星 / 内部海

Outline of Research at the Start

外惑星領域における衛星や準惑星の内部では、潮汐作用などが原因となって氷が溶け、内部海が形成されているものもある。「とろみ」のついたスープが冷めにくいように、氷衛星内部海の「とろみ」は内部の熱進化に極めて重要な役割を果たしている。そこで本研究計画では、氷衛星内部海物質として想定される硫酸塩水溶液について、高圧力下で粘度測定を行う。また、測定結果を基に、氷衛星内部海の進化過程を考察する。

Outline of Annual Research Achievements

太陽系の外惑星領域では，表面が氷で覆われた天体が多数存在している。氷は水に浮くため，表面が凍っていても内部には液体になった領域が存在する天体がある。この様に天体内部に存在する水の領域は内部海と呼ばれている。内部海の存在が確認されている天体には木星の衛星であるエウロパや土星の衛星であるエンセラダスなどがあるが，エンセラダスでは内部海の物質が噴出する様子が探査衛星によって観測されており，この活動は氷火山と呼ばれている。さて，内部海はさらに内部の岩石との反応によって様々な成分が溶けていると考えられており，純粋な水ではない。特に，探査衛星によって軌道上には塩化ナトリウムやシリカが確認されていることから，内部海にはこれらの成分が溶けていたことがわかる。そこで本研究では，内部海の活動を理解するため，塩を含む水溶液の粘度を高圧力下で測定した。本年度はシリカ成分を追加した。実験は0～80 MPa, 260～300Kでシリカと塩化ナトリウムの量を変えて行った。実験の結果，粘度はシリカ成分の量に依存し，10 wt%で3桁の割合で増加することが分かった。また，NaClが5%増えると粘度は3～5倍増加することが明らかとなった。さらに，粘度の圧力依存性は横ばいもしくは単調増加であることが示され，純粋な水の粘度の圧力依存性とは異なることが分かった。この様にシリカ成分と塩を含む内部海の粘度は純粋な水の値と比べて最大で5桁も高くなる可能性があることから，内部海の冷却速度は大幅に低下することが考えられる。

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Localized Deformation of Lawsonite During Cold Subduction (2022)
  • Author(s): Shiraishi R.、Muto J.、Tsunoda A.、Sawa S.、Suzuki A.
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 127 Issue: 2
  • DOI: 10.1029/2021jb022134
  • Peer Reviewed
• [Journal Article] In situ X–ray diffraction study of the phase boundary between diaspore and δ–AlOOH (2022)
  • Author(s): Suzuki A.
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 117 Issue: 1 Pages: n/a
  • DOI: 10.2465/jmps.211215
  • ISSN: 1345-6296, 1349-3825
  • Peer Reviewed / Open Access
• [Journal Article] Phase boundary of FeOOH at high pressure and temperature (2022)
  • Author(s): Ikeda, O., Sakamaki, T., Ohashi, T., Ito, Y., and Suzuki, A.
  • Journal Title: Photon Factory Activity Report 2021 Volume: 39 Pages: 10-10
  • Open Access
• [Journal Article] In-situ X-ray diffraction study of phase transitions in ScOOH (2022)
  • Author(s): Ito, Y., Ikeda, O., Ban, R., Kubota, T., Sakamaki, T., Kuribayashi, T., and Suzuki, A.
  • Journal Title: Photon Factory Activity Report 2021 Volume: 39 Pages: 14-14
  • Open Access
• [Journal Article] The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle (2021)
  • Author(s): Ohira Itaru、Jackson Jennifer M.、Sturhahn Wolfgang、Finkelstein Gregory J.、Kawazoe Takaaki、Toellner Thomas S.、Suzuki Akio、Ohtani Eiji
  • Journal Title: Scientific Reports Volume: 11 Issue: 1 Pages: 12036-12036
  • DOI: 10.1038/s41598-021-91180-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Phase transitions of ScOOH under high pressure (2021)
  • Author(s): Ito Yoshiaki、Ikeda Osamu、Ban Rintaro、Kubota Taito、Sakamaki Tatsuya、Kuribayashi Takahiro、Suzuki Akio
  • Journal Title: High Pressure Research Volume: 41 Issue: 3 Pages: 275-289
  • DOI: 10.1080/08957959.2021.1964495
  • Peer Reviewed
• [Journal Article] Structure of basaltic glass at pressures of up to 18 GPa (2021)
  • Author(s): Ohashi Tomonori、Sakamaki Tatsuya、Funakoshi Ken-ichi、Hattori Takanori、Hisano Naoki、Abe Jun、Suzuki Akio
  • Journal Title: American Mineralogist Volume: in press Issue: 3 Pages: 325-335
  • DOI: 10.2138/am-2021-7742
  • Peer Reviewed
• [Journal Article] Evaluation of a disposable type of 6-6 frame for high-pressure experiments (2021)
  • Author(s): Fuchizaki, K., Wada, T., Naruta, H., Nakamura, K., and Suzuki, A.
  • Journal Title: Photon Factory Activity Report 2020 Volume: 38 Pages: 72-72
  • Open Access
• [Journal Article] Elastic properties and structures of pyrope glass under high pressures (2021)
  • Author(s): Hisano Naoki、Sakamaki Tatsuya、Ohashi Tomonori、Funakoshi Ken-ichi、Higo Yuji、Shibazaki Yuki、Suzuki Akio
  • Journal Title: American Mineralogist Volume: 106 Issue: 1 Pages: 7-14
  • DOI: 10.2138/am-2020-7410
  • Peer Reviewed
• [Journal Article] A unique multianvil 6-6 assembly for a cubic-type multianvil apparatus (2021)
  • Author(s): Fuchizaki Kazuhiro、Wada Tomoyuki、Naruta Hiroki、Suzuki Akio、Irino Kazuo
  • Journal Title: Review of Scientific Instruments Volume: 92 Issue: 2 Pages: 025117-025117
  • DOI: 10.1063/5.0039306
  • Peer Reviewed
• [Journal Article] Effect of sulfur on sound velocity of liquid iron under Martian core conditions (2020)
  • Author(s): Nishida, K., Shibazaki, Y., Terasaki, H., Higo, Y., Suzuki, A., Funamori, N., and Hirose, H.
  • Journal Title: Nature Communications Volume: 11 Issue: 1 Pages: 1954-1954
  • DOI: 10.1038/s41467-020-15755-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effects of alkali and alkaline-earth cations on the high-pressure sound velocities of aluminosilicate glasses (2020)
  • Author(s): Aoki Koji、Sakamaki Tatsuya、Ohashi Tomonori、Ikeda Osamu、Suzuki Akio
  • Journal Title: Physics and Chemistry of Minerals Volume: 47 Issue: 6 Pages: 28-28
  • DOI: 10.1007/s00269-020-01098-3
  • Peer Reviewed
• [Journal Article] The sound velocity of wustite at high pressures: implications for low-velocity anomalies at the base of the lower mantle (2020)
  • Author(s): Tanaka Ryosuke、Sakamaki Tatsuya、Ohtani Eiji、Fukui Hiroshi、Kamada Seiji、Suzuki Akio、Tsutsui Satoshi、Uchiyama Hiroshi、Baron Alfred Q.R.
  • Journal Title: Progress in Earth and Planetary Science Volume: 7 Issue: 1 Pages: 23-23
  • DOI: 10.1186/s40645-020-00333-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Structure and Density of H2O‐Rich Mg2SiO4 Melts at High Pressure From Ab Initio Simulations (2020)
  • Author(s): Yuan Liang、Steinle‐Neumann Gerd、Suzuki Akio
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 125 Issue: 10
  • DOI: 10.1029/2020jb020365
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Structure of hydrous sodium silicate melts at high pressures and high temperatures by in-situ neutron and X-ray diffraction experiments (2022)
  • Author(s): Ohashi, T., Sakamaki, T., Funakoshi, K., Hattori, T., and Suzuki, A.
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] The partial molar volume of Fe2O3 in magma under high pressure (2022)
  • Author(s): Ban, R., Sakamaki, T. and Suzuki, A.
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] 氷衛星内部海水を模擬した塩水溶液の粘度測定 (2022)
  • Author(s): 鈴木昭夫
  • Organizer: 第5回水惑星学全体会議
• [Presentation] Pressure-induced structural change of basaltic glass up to 18 GPa (2021)
  • Author(s): Ohashi, T., Sakamaki, T., Funakoshi, K., Hattori, T., Hisano, N., Abe, J. and Suzuki, A.
  • Organizer: JpGU Meeting 2021
  • Int'l Joint Research
• [Presentation] Density of Fe2O3-bearing magma under high pressure (2021)
  • Author(s): Ban, R., Sakamaki, T. and Suzuki, A.
  • Organizer: JpGU Meeting 2021
  • Int'l Joint Research
• [Presentation] Deuterium content and site occupancy in iron sulphide at high pressure and high temperature: Implications for the oxidation of early Earth’s mantle (2021)
  • Author(s): Abykoon, S., Howard, C., Dominijanni, S., Eberhard, L., Frost, D., Boffa Ballaran, T., Kumosov, A., Terasaki, H., Sakamaki, T., Suzuki, A., Ohtani, E., Sano-Furukawa, A., and Abe, J.
  • Organizer: Goldschmidt 2021
  • Int'l Joint Research
• [Presentation] 月の溶岩の粘度 (2021)
  • Author(s): 渡邉隆二，後藤章夫，鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] 硫酸マグネシウム水溶液の低温高圧における粘性測定：氷衛星内部流体に関する考察 (2021)
  • Author(s): 野崎舜介，鎌田誠司，鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] β-CrOODの水素結合配置の温度圧力依存性 (2021)
  • Author(s): 市東力，鍵裕之，佐野亜沙美，柿澤翔，小松一生，飯塚理子，青木勝敏，阿部淳，町田真一，齊藤高志，神山崇，古川登，鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] ε-FeOOHの弾性波速度に対する圧力誘起鉄スピン転移の影響 (2021)
  • Author(s): 池田理，坂巻竜也，福井宏之，内山裕士，Baron Alfred，鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] Phase transition of M3+OOH-type oxyhydroxides under high pressure (2021)
  • Author(s): 鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] Density measurement of silicate melt by the buoyancy test under high pressure (2021)
  • Author(s): 鈴木昭夫
  • Organizer: 日本地球惑星科学連合2021年大会
• [Presentation] ステアリン酸からのダイヤモンド生成に伴う炭素同位体分別効果 ~C-H-O流体の炭素同位体組成決定へ向けた予察的検討~ (2021)
  • Author(s): 川村英彰，大藤弘明，サティシュ クマールマドスーダン，鈴木昭夫
  • Organizer: 日本鉱物科学会 2021年年会
• [Presentation] Phase boundary between diaspore and δ-AlOOH (2021)
  • Author(s): 鈴木昭夫
  • Organizer: 日本鉱物科学会 2021年年会
• [Presentation] マグマ内に存在するFe2O3の高圧下での部分モル体積 (2021)
  • Author(s): 坂凛太郎，鈴木昭夫，坂巻竜也
  • Organizer: 日本鉱物科学会 2021年年会
• [Presentation] Viscosity of aqueous MgSO4 solutions at high-pressure and low-temperature: implications for icy satellites (2021)
  • Author(s): 野崎舜介，鎌田誠司，鈴木昭夫
  • Organizer: 第22回月惑星研究会
• [Presentation] Viscosity of aqueous MgSO4 solutions at high-pressure and low-temperature: implications for icy satellites (2021)
  • Author(s): 野崎舜介，鎌田誠司，鈴木昭夫
  • Organizer: 第4回水惑星学全体会議
• [Presentation] Nitrogen contents and nitrogen isotope fractionation in subduction zones (2020)
  • Author(s): Melai, C., Frost, D.J., Furukawa, Y., Ishida, A. and Suzuki, A.
  • Organizer: Goldschmidt Virtual 2020
  • Int'l Joint Research
• [Presentation] Longitudinal wave velocity of sodium aluminosilicate melt at high pressure (2020)
  • Author(s): Sakamaki, T., Aoki, K., Ikeda, O., Katayama, H., Higo, Y. and Suzuki, A.
  • Organizer: Goldschmidt Virtual 2020
  • Int'l Joint Research
• [Presentation] Light elements in iron-hydrous silicate system: Searching for core formation process using in-situ high-pressure and high-temperature neutron and X-ray observations (2020)
  • Author(s): Iizuka-Oku, R., Gotou, H., Shito, C., Kagi, H. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Density of Fe3+-bearing magma at high pressure (2020)
  • Author(s): Ban, R., Sakamaki, T. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Phase boundary and kinetics of moganite-coesite phase transition at high-pressure and high-temperature: implications for an impact event and trace of water on the Moon (2020)
  • Author(s): Ozawa, S., Kayama, M., Sakamaki, T., Ohashi, T. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] High-pressure and -temperature experiments simulating the lunar KREEP layer and constraint on its water content (2020)
  • Author(s): Muranushi, M., Kayama, M., Miyamoto, T., Kamada, S., Nagaoka, H and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Structure and density of H2O-rich Mg2SiO4 melts at high pressure from ab initio simulations (2020)
  • Author(s): Steinle-Neumann, G., Yuan, L. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Semi-brittle behavior of lawsonite in high pressure deformation experiments (2020)
  • Author(s): Shiraishi, R., Muto, J., Tsunoda, A., Sawa, S. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Effect of water on the structure of sodium silicate melts under pressure (2020)
  • Author(s): Ohashi, T., Sakamaki, T., Funakoshi, K., Muranushi, M., Shito, C., Ikeda, O., Shibazaki, Y. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] High-PT neutron diffraction experiments on guyanaite: Pressure-temperature dependence of hydrogen bonding in hydrous minerals (2020)
  • Author(s): Shito, C., Kagi, H., Sano-Furukawa, A., Kakizawa, S., Komatsu, K., Aoki, K., Iizuka-Oku, R., Machida, S., Furukawa, N. and Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Density measurement of magmas under high pressure by the sink/float method (2020)
  • Author(s): Suzuki, A.
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] D111型装置を用いた一軸圧縮変形場におけるMg2SiO4オリビン－スピネル相転移の放射光その場観察 (2020)
  • Author(s): 森悠一郎，久保友明，小泉早苗，西原遊，鈴木昭夫
  • Organizer: 第61回高圧討論会
• [Remarks] 量子ビーム地球科学研究室
  • URL: http://epms.es.tohoku.ac.jp/QuEST/index.html
• [Remarks] 量子ビーム地球科学研究室
  • URL: http://epms.es.tohoku.ac.jp/QuEST/