P–V–T equation of state of Na-majorite to 21 GPa and 1673 K

The P-V-T equation of state (EoS) for Na-majorite at pressures to 21 GPa and temperatures to 1673 K 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 ce...

Full description

Saved in:
Bibliographic Details
Published in:Physics of the earth and planetary interiors 2014-02, Vol.227, p.68-75
Main Authors: Dymshits, Anna M., Litasov, Konstantin D., Shatskiy, Anton, Sharygin, Igor S., Ohtani, Eiji, Suzuki, Akio, Pokhilenko, Nikolay P., Funakoshi, Kenichi
Format: Article
Language:English
Subjects:
Compressing
Derivatives
Earth mantle
Equations of state
Fittings
Garnets
Mathematical models
Thermoelastic properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The P-V-T equation of state (EoS) for Na-majorite at pressures to 21 GPa and temperatures to 1673 K 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) (Aa3); 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 = 1475.88 Aa3, K0,300 = 184 (4) GPa, K0,300'=3.8 (6), ( partial differential K0,T/ partial differential T)P = -0.023 (5) (GPa K-1), and a = 3.17 (16) 10-5 K-1, b = 0.16 (26) 10-8 K-2, where alpha = a + bT is the volumetric thermal expansion coefficient. Fitting the Mie-Grueneisen-Debye EoS with the present data to Debye temperature fixed at [thetas]0 = 890 K yielded Grueneisen parameter, gamma 0 = 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.
ISSN:0031-9201
DOI:10.1016/j.pepi.2013.11.005