TY - JOUR
T1 - P-V-T equation of state of Na-majorite to 21GPa and 1673K
AU - Dymshits, Anna M.
AU - Litasov, Konstantin D.
AU - Shatskiy, Anton
AU - Sharygin, Igor S.
AU - Ohtani, Eiji
AU - Suzuki, Akio
AU - Pokhilenko, Nikolay P.
AU - Funakoshi, Kenichi
N1 - Funding Information:
We thank the reviewers for critical comments and suggestions. Andrey Gorbachev is thanked for drafting ( Fig. 2 ). Luca Bindi is thanked for crystallochemical data of Na-maj. This work was supported by the Ministry of Education and Science of Russian Federation (project No 14.B25.31.0032), integration project of Siberian Branch of Russian Academy of Science No 97 for 2012-2014, Russian Foundation for Basic Research (Grants Nos 12-05-33008-a and 12-05-31351-mol-a), grant-in-Aid for Young Scientists No 21684032 and grant-in-Aid for Scientific Research on Innovative Areas No 20103003 from Japan Society for Promotion of Science. The project was conducted as a part of the Global Center-of-Excellence Program ‘Global Education and research Center for Earth and Planetary dynamics’ at Tohoku University. Experiments were conducted under ‘SPring-8’ general research proposals Nos 2011B1091, 2012A1416, 2012B1289 and Photon Factory No 2012G031.
PY - 2014/2
Y1 - 2014/2
N2 - The P-V-T equation of state (EoS) for Na-majorite at pressures to 21GPa and temperatures to 1673K was obtained from in situ X-ray diffraction experiments using a Kawai-type multi-anvil apparatus. Analyses of the room-temperature P-V data to a third-order Birch-Murnaghan EoS yielded ambient unit cell volume, V0=1476 (1) (Å3); isothermal bulk modulus, K0,300=181 (9) GPa; and its pressure derivative, K0,300'=4.4 (1.2). When fitting a high-temperature Birch-Murnaghan EoS using entire P-V-T data at a fixed V0=1475.88Å3, K0,300=184 (4) GPa, K0,300'=3.8 (6), (∂K0,T/∂ T)P=-0.023 (5) (GPaK-1), and a=3.17 (16)×10-5K-1, b=0.16 (26)×10-8K-2, where α=a+bT is the volumetric thermal expansion coefficient. Fitting the Mie-Grüneisen-Debye EoS with the present data to Debye temperature fixed at θ0=890K yielded Grüneisen parameter, γ0=1.35 at q=1.0 (fixed). The new data on Na-majorite were compared with the previous data on majorite type garnets. The compression mechanism of majoritic garnets was described in detail. The entire dataset enabled to examine the thermoelastic properties of important mantle garnets and these data will have further applications for modeling P-T conditions in the transition zone of the Earth's mantle using ultradeep mineral assemblages.
AB - The P-V-T equation of state (EoS) for Na-majorite at pressures to 21GPa and temperatures to 1673K was obtained from in situ X-ray diffraction experiments using a Kawai-type multi-anvil apparatus. Analyses of the room-temperature P-V data to a third-order Birch-Murnaghan EoS yielded ambient unit cell volume, V0=1476 (1) (Å3); isothermal bulk modulus, K0,300=181 (9) GPa; and its pressure derivative, K0,300'=4.4 (1.2). When fitting a high-temperature Birch-Murnaghan EoS using entire P-V-T data at a fixed V0=1475.88Å3, K0,300=184 (4) GPa, K0,300'=3.8 (6), (∂K0,T/∂ T)P=-0.023 (5) (GPaK-1), and a=3.17 (16)×10-5K-1, b=0.16 (26)×10-8K-2, where α=a+bT is the volumetric thermal expansion coefficient. Fitting the Mie-Grüneisen-Debye EoS with the present data to Debye temperature fixed at θ0=890K yielded Grüneisen parameter, γ0=1.35 at q=1.0 (fixed). The new data on Na-majorite were compared with the previous data on majorite type garnets. The compression mechanism of majoritic garnets was described in detail. The entire dataset enabled to examine the thermoelastic properties of important mantle garnets and these data will have further applications for modeling P-T conditions in the transition zone of the Earth's mantle using ultradeep mineral assemblages.
KW - Equation of state
KW - High pressure experiment
KW - Na-majorite
KW - X-ray diffraction
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U2 - 10.1016/j.pepi.2013.11.005
DO - 10.1016/j.pepi.2013.11.005
M3 - Article
AN - SCOPUS:84895067020
VL - 227
SP - 68
EP - 75
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
ER -