![]() ![]() Nishi M, Irifune T, Tsuchiya J, Tange Y, Nishihara Y, Fujino Y, Higo Y (2014) Stability of hydrous silicate at high pressures and water transport to the deep lower mantle. Matrosova EA, Welch MD, Bobrov AV, Bindi L, Pushcharovsky DY, Irifune T (2019) Incorporation of Ti into the crystal structures of the high-pressure dense silicates anhydrous phase B and superhydrous phase B. In: Price E (ed) International Tables for Crystallography Volume C (Mathematical, physical and chemical tables). Maslen EN, Fox AG, O'Keefe MA (2004) X-ray scattering. Liu L-G, Lin C-C, Mernagh TP, Inoue T (2002) Raman spectra of phase C (superhydrous phase B) at various pressures and temperatures. Litasov KD, Ohtani E (2003) Stability of various hydrous phases in CMAS-pyrolite-H2O system up to 25 GPa. Libowitzky E (1999) Correlation of O–H stretching frequencies and O–H…O hydrogen bond lengths in mineral. American Institute of Physics, pp 469–472. In: Schmidt SC, Shaner JW, Samara GA, Ross M (eds) High-Pressure Science and Technology. Kudoh Y, Nagase T, Ohta S, Sasaki S, Kanzaki M, Tanaka M (1994) Crystal structure and compressibility of superhydrous phase B, Mg 20Si 6H 8O 36. Komabayashi T, Omori S, Maruyama S (2004) Petrogenetic grid in the system MgO-SiO 2-H 2O up to 30 GPa, 1600☌: applications to hydrous peridotite subducting into the Earth’s deep interior. ![]() Komabayashi T, Omori S (2006) Internally consistent thermodynamic data set for dense hydrous magnesium silicates up to 35 GPa, 1600☌: implications for water circulation in the Earth’s deep mantle. Koch-Müller M, Dera P, Rei Y, Hellwig H, Liu Z, Van Orman J, Wirth R (2005) Polymorphic phase transition in superhydrous phase B. Kawamoto T (2006) Hydrous phases and water transport in the subducting slab. ![]() Kawamoto T (2004) Hydrous phase stability and partial melt chemistry in H 2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions. Katsura T, Yoneda A, Yamazaki D, Yoshino T, Ito E (2010) Adiabatic temperature profile in the mantle. Kakizawa S, Inoue T, Nakano H, Sakamoto N, Yurimoto H (2018) Stability of Al-bearing superhydrous phase B at the mantle transition zone and the uppermost lower mantle. Hovestreydt E (1983) On the atomic scattering factor for O 2. Horiuchi H, Sawamoto H (1981) β-Mg 2SiO 4: single-crystal X-ray diffraction study. Holl CM, Smyth JR, Jacobsen SD, Frost DJ (2008) Effect of hydration on the structure and compressibility of wadsleyite, β-(Mg 2SiO 4). Gasparik T (1990) Phase relations in the transition zone. įrost DJ, Fei Y (1998) Stability of phase D at high pressure and high temperature. įarrugia LJ (1999) WinGX suite for small-molecule single-crystal crystallography. Ĭynn H, Hofmeister AM, Burnley PC (1996) Thermodynamic properties and hydrogen speciation from vibrational spectra of dense hydrous magnesium silicates. īrown JM, Shankland TJ (1981) Thermodynamic parameters in the Earth as determined from seismic profiles. īrown ID, Altermatt D (1985) Bond-valence parameters obtained from a systematic analysis of the inorganic crystal structure database. By summarizing the present study together with the previous studies, it is predicted that the cause of the phase transition between Pnnm and Pnn2 occurs at ~ 1300 ℃ due to the synthesis temperature, which is not due to the substitution of metal elements.īrese NE, O’Keeffe M (1991) Bond-valence parameters for solids. The obtained FT–IR spectra, difference Fourier maps, and bond-valence revealed new H positions at (1) O 6–H⋯O 4, which is a part of the AlO 6 octahedron (2) O 5–H⋯O 3, which is the same as the Mg-endmember superhydrous phase B, and (3) O4-H⋯O1, which is the shared edge of the Mg2O 6 and Mg4O 6 octahedra. Furthermore, the result is consistent with a previously proposed substitution reaction: 2Mg 2+ + Si 4+ ⇄ 2Al 3+ + 2H + + □ Mg. From crystal structure refinement, we clarified that Al was located in the octahedral Mg1, Mg2, and Si1 sites with a Pnnm space group. ![]() Here, we investigated the crystal structure of Al-bearing superhydrous phase B (Mg 8.1Si 2.0Al 1.9H 5.9O 18) by single-crystal X-ray diffraction (SC-XRD), together with Raman and Fourier-transform infrared (FT–IR) spectroscopies to determine the positions of Al and predict the positions of H. A large amount of Al can be substituted in the crystal structure of superhydrous phase B, but its position in the crystal structure has yet to be determined. Superhydrous phase B is an important dense hydrous magnesium silicate (DHMS) phase in a hydrous peridotite system for understanding the deep water cycle in the Earth’s interior. ![]()
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