Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6447600 | Physics of the Earth and Planetary Interiors | 2013 | 21 Pages |
Abstract
Pressure-volume-temperature relations have been measured to 33 GPa and 1673 K for natural siderite (Fe0.95Mn0.05CO3) using synchrotron X-ray diffraction with a multianvil apparatus at the 'SPring-8' facility. A least-squares fit of the room-temperature compression data to a third-order Birch-Murnaghan equation of state (EOS) yielded K0 = 120 ± 1 GPa and Kâ²Â = 3.57 ± 0.09, with fixed V0 = 293.4 ± 0.1 Ã
3. Further analysis of the high-temperature compression data yielded the temperature derivative of the bulk modulus (â KT/âT)P = â0.015 ± 0.001 GPa/K and zero-pressure thermal expansion α = a0 + a1T with a0 = 3.57(9) Ã 10â5 Kâ1 and a1 = 0.06(14) Ã 10â8 Kâ2. The analysis of axial compressibility indicates that the c-axis is more compressible (KTc = 59 ± 1 GPa at Kâ²Â = 2.7 ± 0.1) than the a-axis (KTa = 166 ± 2 GPa at Kâ²Â = 14.0 ± 0.8). The present thermal EOS enables accurate calculation the density and thermodynamic properties of siderite to the deep mantle conditions.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geophysics
Authors
Konstantin D. Litasov, Anton Shatskiy, Pavel N. Gavryushkin, Igor S. Sharygin, Peter I. Dorogokupets, Anna M. Dymshits, Eiji Ohtani, Yuji Higo, Kenichi Funakoshi,