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

2010 Fiscal Year Annual Research Report

• Project/Area Number: 22540486
• Research Institution: Tohoku University
• Principal Investigator: LITASOV Konstantin 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

2010年には、6-20GPaの条件で使用可能なマルチアンビル高圧装置用の二重カプセルを開発した。これを用いて、我々は3-16GPaまでの条件において、還元性のC-H-O流体とカンラン岩、エクロジャイト系の高温高圧実験を行った。Mo-・MoO2バッファ、Fe-FeOバッファの酸素分圧を制御するために、MoとFeの外部カプセルを使用した。その結果、還元的な流体C-H-O流体と共存するカンラン石やエクロジャイトのソリダス温度がかなり上昇することが明らかになった。
ソリダス温度は、H2O+CO2からなる酸化的な流体の存在する系に比べてソリダス温度が300-400℃も増加することが明らかになった。現在、ダイヤモンドアンビルを用いた流体のラマン分光測定を進めている。
放射光を用いたX線粉末解析によって、30GPaまでの金属-金属酸化物の状態方程式を決定するための実験を行った。この実験では、高圧実験中に酸素分圧の制御を行う必要があり、これに成功すれば、高圧研究法を大きく進めることができる。2010年には、Mo-MoO2、Re-ReO2、そしてW-WO_2-WCバッファについて研究をすすめた。
2-31GPaの条件で、アルカリ炭酸塩の相関係の研究を行った。Na2OおよびK2Oに富んだCa-Mg炭酸塩溶液(Na202%およびK207%およびその逆の組成)について実験を行った。3GPaおよび6GPaのソリダス温度はそれぞれ750℃および850℃近くであった。
6GPaから10GPaまでの間では、ソリダス温度は1150℃まで大きな増加が認められた。さらに高圧の10GPaから21GPaの間でソリダスは平坦になった。
K含有システムやNa含有システムにおいては、様々なアルカリ含有炭酸塩鉱物が認められた。それらは、3GPaではNa_2Mg_2(CO_3)_2、6.5GPaでは(K,Na)_2Ca_2(CO_3)_2、3-21GPaの条件では、(K,Na)_2Mg_2(CO_3)_3-(K,Na)_2Mg(CO_3)_2および(K,Na)_2Ca_4(CO_3)_5-CaCO_3固溶体であった。

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] Effect of Al_2O_3 on water solubility in periclase and ferropericlase at 25 GPa (2010)
  • Author(s): Litasov, K.D.
  • Journal Title: Russian Geology and Geophysics Volume: 51 Pages: 644-649
  • Peer Reviewed
• [Journal Article] The solidus of carbonated eclogite in the system CaO-Al_2O_3-MgO-SiO_2-Na_2O-CO_2 to 32 GPa and carbonatite liquid in the deep mantle (2010)
  • Author(s): Litasov, K.D., Ohtani, E.
  • Journal Title: Earth and Planetary Science Letters Volume: 295 Pages: 115-126
  • Peer Reviewed
• [Journal Article] Effect of oxygen fugacity on the H_2O storage capacity of forsterite in the carbon-saturated systems (2010)
  • Author(s): Sokol, A.G., Palyanov, Y.N., Kupriyanov, I.N., Litasov, K.D., Polovinka, M.P.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 74 Pages: 4793-4806
  • Peer Reviewed
• [Journal Article] Performance of semi-sintered ceramics as pressure transmitting media up to 30 GPa (2010)
  • Author(s): Shatskiy, A., Litasov, K.D., Terasaki, H., Katsura, T., Ohtani, E.
  • Journal Title: High Pressure Research Volume: 30 Pages: 443-450
  • Peer Reviewed
• [Journal Article] Pressure-volume-temperature equation of state of tungsten carbide to 32 GPa and 1673 K (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Fei, Y., Suzuki, A., Ohtani, E., Funakoshi, K.
  • Journal Title: Journal of Applied Physics Volume: 74
  • Peer Reviewed
• [Journal Article] Experimental constraints on the role of chloride in the origin and evolution of kimberlitic magma (2010)
  • Author(s): Litasov, K.D., Sharygin, I.S., Shatskiy, A.F., Ohtani, E., Pokhilenko, N.P.
  • Journal Title: Doklady Earth Science Volume: 435 Pages: 1648-1653
  • Peer Reviewed
• [Journal Article] Origin of Cl-bearing silica-rich melt inclusions in diamond : experimental evidence for an eclogite connection (2010)
  • Author(s): Litasov, K.D., Safonov, O.G., Ohtani, E.
  • Journal Title: Geology Volume: 38 Pages: 1131-1134
  • Peer Reviewed
• [Presentation] Carbon cycle in the subduction zone and deep mantle : Constraints from equilibrium experiments at high pressure and temperature (2010)
  • Author(s): Fei, Y., Litasov, K.D.
  • Organizer: American Geophysical Union, Fall Meeting
  • Place of Presentation: San-Francisco, USA
  • Year and Date: 20101213-20101217
• [Presentation] Melting phase relations of K- and Na-bearing carbonatite at 3-21 GPa with implication to deep carbon cycle (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E.
  • Organizer: American Geophysical Union, Fall Meeting
  • Place of Presentation: San-Francisco, USA
  • Year and Date: 20101213-20101217
• [Presentation] Melting phase relations of model alkali carbonatite systems at 3-21 GPa and implication to mantle metasomatism (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Ohtani, E.
  • Organizer: 51th High-Pressure Conference of Japan
  • Place of Presentation: 仙台
  • Year and Date: 20101020-20101023
• [Presentation] Dissolution-precipitation as a possible mechanism for C-O-H fluid transport in the mantle (2010)
  • Author(s): Shatskiy, A.F., Litasov, K.D., Borzdov, Y.M., Katsura, T., Ohtani, E.
  • Organizer: XVI All-Russian Conference on Experimental Mineralogy
  • Place of Presentation: Chernogolovka, Russia
  • Year and Date: 20100920-20100924
• [Presentation] The influence of chloride components on mantle melting : a review of the experimental data and future perspectives (2010)
  • Author(s): Safonov, O.G., Litasov, K.D.
  • Organizer: XVI All-Russian Conference on Experimental Mineralogy
  • Place of Presentation: Chernogolovka, Russia
  • Year and Date: 20100920-20100924
• [Presentation] Reactions between Mg- and Ca-carbonates with SiO_2 and iron at high pressures (2010)
  • Author(s): Litasov, K.D.
  • Organizer: XVI All-Russian Conference on Experimental Mineralogy
  • Place of Presentation: Chernogolovka, Russia
  • Year and Date: 20100920-20100924
• [Presentation] High-pressure experiments on anhydrous carbonated eclogite at 9-20 GPa-implications for the recycling of carbonate into the mantle (2010)
  • Author(s): Kiseeva, E.S., Litasov, K.D., Yaxley, G.M., Ohtahi, E., Kamenetsky, V.S.
  • Organizer: 20^<th> General Meeting of International Mineralogical Association
  • Place of Presentation: Budapest, Hungary
  • Year and Date: 20100821-20100827
• [Presentation] carbonate-silicate-Fe-metal reactions and stability of C-O-H species in the Earth's mantle (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Terasaki, H., Ohtani, E.
  • Organizer: Dynamic Earth arid Heterogenous Structure, Global Center Of Excellence Symposium
  • Place of Presentation: 仙台
  • Year and Date: 20100713-20100715
• [Presentation] Effect of carbon and hydrogen on melting and magma properties at high pressure (2010)
  • Author(s): Ohtani, E., Sakamaki, T., Litasov, K.D.
  • Organizer: 2010 Japan Geoscience Union Meeting
  • Place of Presentation: 千葉
  • Year and Date: 20100523-20100528
• [Presentation] Carbon-silicate-Fe-metal reactions at high pressures : New experimental constraints on deep volatile cycles (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Terasaki, H., Ohtani, E., Fei, Y.
  • Organizer: 2010 Japan Geoscience Union Meeting
  • Place of Presentation: 千葉
  • Year and Date: 20100523-20100528
• [Presentation] Incipient fluid migration through the deep mantle by dissolution-precipitation : crystal growth constraints (2010)
  • Author(s): Shatskiy, A., Litasov, K.D., Yamazaki, D., Borzdov, Y.M., Kastura, T., Ohtani, E.
  • Organizer: 2010 Japan Geoscience Union Meeting
  • Place of Presentation: 千葉
  • Year and Date: 20100523-20100528
• [Presentation] Experimental study of carbdnate-silicate-metal equilibria at pressures to 30 GPa : New insights into deep volatile cycles (2010)
  • Author(s): Litasov, K.D., Shatskiy, A., Fei, Y., Ohtani, E.
  • Organizer: EGU General Asssembly 2010
  • Place of Presentation: Vienna, Austria
  • Year and Date: 20100502-20100507
• [Presentation] Incipient fluid migration through the deep mantle by dissolution-precipitation : crystal growth constraints (2010)
  • Author(s): Shatskiy, A., Litasov, K.D., Borzdov, Y.M., Katsura, T., Ohtani, E.
  • Organizer: EGU General Assembly 2010
  • Place of Presentation: Vienna, Austria
  • Year and Date: 20100502-20100507
• [Presentation] Experimentally determined phase and melting relations of carbonate eclogite from 9 to 20 GPa (2010)
  • Author(s): Yaxley, G.M., Kiseeva, E.S., Litasov, K.D.
  • Organizer: 2^<nd> Deep Carbon Cycle Conference
  • Place of Presentation: Beijing, China
  • Year and Date: 20100421-20100425
• [Presentation] Effect of Carbon and Hydrogen on phase and melting relations and melt properties at high pressure (2010)
  • Author(s): Ohtani, E., Litasov, K.D., Sakamaki, T., Takahashi, S., Terasaki, H.
  • Organizer: 2^<nd> Deep Carbon Cycle Conference
  • Place of Presentation: Beijing, China
  • Year and Date: 20100421-20100425