Bulk modulus of Fe-rich olivines corrected for non-hydrostaticity |
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| Authors: | Frédéric Béjina Misha Bystricky Nicolas Tercé Matthew L Whitaker Haiyan Chen |
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| Institution: | 1. IRAP, Université de Toulouse, CNRS, CNES, UPS, 14, avenue Édouard-Belin, 31400 Toulouse, France;2. Mineral Physics Institute, Stony Brook University, Stony Brook, NY 11794-2100, USA;3. Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA;4. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, USA |
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| Abstract: | In situ X-ray diffraction was used to measure the isothermal bulk modulus at room conditions (KT0) of synthetic olivines with different iron contents. The chemical formulae of the olivine samples were with x = 0.45; 0.64; 0.82; 1, with 1% standard deviation (referenced as Fa45, Fa64, Fa82 and Fa100, respectively). All experiments were performed in the multi-anvil apparatus installed at NSLS beamline X17B2, to pressures up to about 7 GPa. Unit-cell volumes under hydrostatic conditions and differential stresses present in the samples were calculated using the method developed by Singh et al. (1998), and pressures measured using NaCl as a standard were then corrected for these stresses. Using a second-order Birch–Murnaghan equation of state, we obtained the isothermal bulk modulus of each composition: GPa, GPa, GPa and GPa. These values combined with data available in the literature show that the KT0 of Fe-rich olivines increases very slowly with the Fe content, but possibly not in a simple linear trend. |
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| Keywords: | Corresponding author Olivine Equation of state High pressure Differential stress Bulk modulus |
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