地球マントル中でのCOH流体の相平衡と地球深部の揮発性元素サイクル

2011 Fiscal Year Annual Research Report

• Project/Area Number: 22540486
• Research Institution: Tohoku University
• Principal Investigator: リタソフ コンスタンチン 東北大学, 大学院・理学研究科, 准教授 (80374916)
• Keywords: 地殻・マントル・核 / 高圧揮発性元素 / 岩鉱・鉱物・鉱床学

Research Abstract

本研究の主要な結果として(1)3-16GPaの圧力条件下における流体と共存しているペリドタイトとエクロジャイトの研究(2)3-21GPaの圧力条件下におけるアルカリ炭酸塩のソリダスの研究の2つが挙げられる。
(1)3-16GPa、1200-1600℃における流体と共存しているペリドタイトとエクロジャイト相平衡
酸素分圧を制御すらためにMo-MoO2もしくはFe-FeOカプセルを使用し、マルチアンビルプレスで高温高圧実験を行った。試料の融解は回収試料の急冷組織から判断し、流体+ペリドタイトのソリダスを3GPaで1200℃、6GPaで1700℃と決定した。また、流体+エクロジャイトのソリダスを3GPaで1100℃、6GPaで1600℃と決定した。これらはより酸化的な条件下におけるソリダスより300-500℃高い温度である。従って、酸化還元状態の違いによって、流体の組成に影響を及ぼし、ペリドタイトやエクロジャイトのソリダスを変化させることが明らかになった。地球深部において様々な境界が存在しているが、それらにおいて酸化還元状態の違いに起因する溶融が起こることを示唆している。
(2)炭酸塩ペリドタイトとエクロジャイトの相平衡
カリウムまたはナトリウムを含む炭酸塩系のソリダスと相平衡を決定し、アルカリ炭酸塩の安定性とマントル融解に対する影響、炭素輸送に関して議論した。高温高圧実験はマルチアンビルプレスを用いて3-21GPa、750-1400℃の条件下で行われた。ソリダスは3GPaで750℃、6GPaで850℃であったが、10GPaでは1150℃まで上昇した。沈み込み帯の温度分布と比較すると、アルカリ炭酸塩の安定領域が増加したことが明らかになった。また、沈み込んだアルカリ炭酸塩が溶融するのは、マントル遷移層に対応する深さであった、そこで炭酸塩マグマが生成され、上部マントル中を通って地表まで上昇すると考えられる。

Research Products

• [Journal Article] Systematic study of hydrogen incorporation into Fe-free wadsleyite (2011)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E., Katsura, T.
  • Journal Title: Physics and Chemistry of Minerals Volume: 38 Pages: 75-84
  • DOI: Doi:10.1007/s00269-010-0382-3
  • Peer Reviewed
• [Journal Article] Crystal chemistry of sodium in the Earth's interior : The structure of Na_2MgSi_5O_<12> synthesized at 17.5GPa and 1700℃ (2011)
  • Author(s): Bindi, L., Dymshits, A.M., Bobrov, A.V., Litasov, K.D., Shatskiy, A.F., Ohtani, E., Litvin, Yu.A.
  • Journal Title: American Mineralogist Volume: 96 Pages: 447-460
  • DOI: Doi:10.2138/am.2011.3716
  • Peer Reviewed
• [Journal Article] Pressless split-sphere apparatus equipped with scaled-up Kawai-cell for mineralogical studies at 10-20GPa (2011)
  • Author(s): Shatskiy, A., Borzdov, Y.M., Litasov, K.D., Ohtani, E., Khokhryakov, A.F., Palyanov, Y.N., Katsura, T.
  • Journal Title: American Mineralogist Volume: 96 Pages: 541-548
  • DOI: Doi:10.2138/am2011.3643
  • Peer Reviewed
• [Journal Article] Phase relations and melting in the peridotite-H_2O-CO_2 and eclogiteH_2O-CO_2 systems at pressures of 3-27GPa (2011)
  • Author(s): Litasov, K.D., Shatskiy, A.F., Pokhilenko, N.P.
  • Journal Title: Doklady Earth Science Volume: 437 Pages: 498-502
  • DOI: Doi:10.1134/S1028334X11040143
  • Peer Reviewed
• [Journal Article] Physicochemical conditions for melting in the Earth's mantle containing a C-O-H fluid (from experimental data) (2011)
  • Author(s): Litasov, K.D.
  • Journal Title: Russian Geology and Geophysics Volume: 52(5) Pages: 475-492
  • DOI: 10.1016/j.rgg.2011.04.001
  • Peer Reviewed
• [Journal Article] High pressure generation using scaled-up Kawai-cell (2011)
  • Author(s): Shatskiy, A., Katsura, T., Litasov, K.D., Shcherbakova, A.V., Borzdov, Y.M., Yamazaki, D., Yoneda, A., Ohtani, E., Ito, E.
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 189 Pages: 92-108
  • DOI: Doi:10.1016/j.pepi.2011.1008.1001
  • Peer Reviewed
• [Journal Article] Crossover from melting to dissociation of CO_2 under pressure : Implications for the lower mantle (2011)
  • Author(s): Litasov, K.D., Goncharov, A.F., Hemley, R.J.
  • Journal Title: Earth and Planetary Science Letters Volume: 309 Pages: 318-323
  • DOI: 10.1016/j.epsl.2011.07.006
  • Peer Reviewed
• [Presentation] Silicate diffusion in alkali-carbonatite and hydrous melt at 16.5 and 24GPa, with implications for mass transfer in the deep mantle (2012)
  • Author(s): Shatskiy, A., Litasov, K.D., Katsura, T., Borzdov, Y.M., Yamazaki, D., Ohtani, E.
  • Organizer: Joint Symposium of Misasa-2012 and Geofluid-2
  • Place of Presentation: Misasa, Japan
  • Year and Date: 20120318-20120321
• [Presentation] Solidi and melting phase relations of alkaline carbonatite at the deep mantle conditions (2012)
  • Author(s): Litasov, K.D., Shatskiy, A.Ohtani, E.
  • Organizer: 9^<th> International Workshop on Water Dynamics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20120307-20120309
• [Presentation] Formation and diapiric mobilization of primary kimberlite melts : experimental constraints (2012)
  • Author(s): Shatskiy, A., Sharygin, I.S., Litasov, K.D.Ohtani, E.
  • Organizer: 9^<th> International Workshop on Water Dynamics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20120307-20120309
• [Presentation] Melting of carbonated peridotite at 10-20GPa : implication to SiO_2-saturation of carbonated magma in the deep mantle (2012)
  • Author(s): Ghosh, S., Litasov, K.D., Ohtani, E.
  • Organizer: 9^<th> International Workshop on Water Dynamics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20120307-20120309
• [Presentation] Thermal decomposition of polycyclic aromatic hydrocarbons at 800-1100K and 6-9GPa : Implication to Earth and planetary carbon dynamics (2012)
  • Author(s): Chanyshev, A.D., Litasov, K.D., Shatskiy, A., Furukawa, Y., Nemoto, M., Mochizuki, S., Ohtani, E., Funakoshi, K.
  • Organizer: 9^<th> International Workshop on Water Dynamics
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20120307-20120309
• [Presentation] Late metasomatic addition of garnet to the SCLM : Os-isotope evidence (2012)
  • Author(s): Malkovets, V.G., Griffin, W.L., Pearson, N.J., Rezvukhin, D.I., O'Reilly, S.Y., Pokhilenko, N.P., Garanin, V.K, Spetsius, Z.V., Litasov, K.D.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Melting phase relations of chlorine-bearing kimberlite at 2.1-6.5GPa and 900-1500℃ (2012)
  • Author(s): harygin, I.S., Litasov, K.D., Shatskiy, A., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Segregation rate and transport mechanism of volatile-bearing melt in the deep mantle (2012)
  • Author(s): Shatskiy A., Litasov K.D., Ohtani E.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Melting of carbonated peridotite at 10-20GPa : implication for origin of kimberlite- and carbonatite-like magma in the deep mantle (2012)
  • Author(s): Ghosh, S., Litasov, K.D., Ohtani, E.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Melting phase relations in the systems peridotite-H_2O-CO_2 and eclogite-H_2O-CO_2 at pressures up to 27GPa (2012)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E., Pokhilenko, N.P.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Melting of peridotite and eclogite coexisting with reduced C-O-H fluid at 3-16GPa : further constraints for redox melting models (2012)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Phase relations of eclogite+4.4% CO_2 at 9-21GPa : implications for diamond formation in the deep mantle (2012)
  • Author(s): Kiseeva, E.S., Litasov, K.D., Yaxley, G.M., Ohtani, E., Kamenetsky, V.S.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Sodium majorite and its Pyrope solid solutions : high pressure experiments and crystal-chemical implications (2012)
  • Author(s): Dymshits, A.M., Bindi, L., Bobrov, A.V., Litasov, K.D., Shatskiy, A.F., Ohtani, E., Litvin, Yu.A.
  • Organizer: 10th International Kimberlite Conference
  • Place of Presentation: Bangalore, India
  • Year and Date: 20120206-20120211
• [Presentation] Deep carbon cycle in the subduction zones (2011)
  • Author(s): Litasov, K.D., Shatskiy, A.F., Ohtani, E.
  • Organizer: The 3^<rd> Deep Carbon Cycle International Workshop
  • Place of Presentation: Altai, Novosibirsk
  • Year and Date: 20110825-20110830
• [Presentation] Heavy hydrocarbons in the high-pressure fluids : Where are we now? (2011)
  • Author(s): Chanyshev, A.D., Litasov, K.D., Goncharov, A.F., Ohtani, E.
  • Organizer: The 3^<rd> Deep Carbon Cycle International Workshop
  • Place of Presentation: Altai, Novosibirsk
  • Year and Date: 20110825-20110830
• [Presentation] Dissolution-precipitation as a possible mechanism of carbonatite melt segregation in upwelling mantle (2011)
  • Author(s): Shatskiy, A.F., Litasov, K.D., Borzdov, Y.M., Katsura, T., Yamazaki, D., Ohtani, E.
  • Organizer: The 3^<rd> Deep Carbon Cycle International Workshop
  • Place of Presentation: Altai, Novosibirsk
  • Year and Date: 20110825-20110830
• [Presentation] Melting in the peridotite and eclogite, coexisting with reduced C-O-H fluid at 3-16GPa (2011)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E.
  • Organizer: 2011 Goldschmidt conference
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 20110814-20110819
• [Presentation] Na-bearing majoritic garnets in the system Mg_3Al_2Si_5O_<12>-Na_2 MgSi_5O_<12> at 11-20GPa : Solid solutions and structural peculiarities (2011)
  • Author(s): Bobrov, A.V., Dymshits, A.M., Bindi, L., Litasov, K.D., Shatskiy, A.F., Ohtani, E., Litvin, Yu.A.
  • Organizer: 2011 Goldschmidt conference
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 20110814-20110819
• [Presentation] Late metasomatic addition of garnet to the SCLM : Os-isotope evidence (2011)
  • Author(s): Malkovets, V.G., Griffin, W.L., Pearson, N.J., Rezvukhin, D.I., O'Reilly, S.Y., Pokhilenko, N.P., Garanin, V.K., Spetsius, Z.V., Litasov K.D.
  • Organizer: 2011 Goldschmidt conference
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 20110814-20110819
• [Presentation] Dissolution-precipitation as a possible mechanism of C-O-H fluid/melt segregation in the deep mantle (2011)
  • Author(s): Shatskiy A., Litasov K.D., Ohtani E.
  • Organizer: 2011 Goldschmidt conference
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 20110814-20110819
• [Presentation] Melting phase relations in the peridotite and eclogite systems Coexisting with reduced C-O-H fluid at 3-16GPa (2011)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E.
  • Organizer: 2011 Japan Geoscience Union Meeting
  • Place of Presentation: Makuhari, Japan
  • Year and Date: 20110522-20110528
• [Presentation] Role of alkali carbonates in the mantle magmatism, metasomatism, and diamond formation (2011)
  • Author(s): Shatskiy A., Litasov K.D., Sharigin I.S., Ohtani E.
  • Organizer: 2011 Japan Geoscience Union Meeting
  • Place of Presentation: Makuhari, Japan
  • Year and Date: 20110522-20110528
• [Presentation] Diffusion of silicates in alkali carbonate malt and water fluid, experimental study at 17-24GPa and 1400-1750℃ (2011)
  • Author(s): Shatskiy, A., Litasov, K.D., Katsura, T., Yamazaki, D., Ohtani, E.
  • Organizer: 2011 Japan Geoscience Union Meeting
  • Place of Presentation: Makuhari, Japan
  • Year and Date: 20110522-20110528