Abstract
Olivine is widely believed to be the most abundant mineral in the Earth’s upper mantle. Here, we report structural refinement results for the Fe-end-member olivine, Fe2SiO4 fayalite, up to 31 GPa in diamond-anvil cell, using single-crystal synchrotron X-ray diffraction. Unit-cell parameters a, b, c and V, average Si–O Fe–O bond lengths, as well as Si–O Fe–O polyhedral volumes continuously decrease with increasing pressure. The pressure derivative of isothermal bulk modulus \(K_{T0}^{\prime }\) is determined to be 4.0 (2) using third-order Birch–Murnaghan equation of state with ambient isothermal bulk modulus fixed to 135 GPa on the basis of previous Brillouin measurements. The Si–O tetrahedron is stiffer than the Fe–O octahedra, and the compression mechanism is dominated by Fe–O bond and Fe–O octahedral compression. Densities of olivine along 1600 and 900 K adiabats are calculated based on this study. The existence of metastable olivine inside the cold subduction slab could cause large positive buoyancy force against subduction, slow down the subduction and possibly affect the slab geometry.
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Acknowledgments
This work was supported by the National Science Foundation (NSF) under Grant EAR 1344942. This work was also partially supported by the Consortium for Materials Properties Research in Earth Sciences (COMPRES) under NSF Cooperative Agreement EAR 11-57758. YH and HS were partially supported by a grant from Carnegie-DOE Alliance Center. Development of the ATREX IDL software is supported under Grant NSF EAR 1440005. Portions of this work were performed at GESCARS (Sector 13), APS, Argonne National Laboratory. GESCARS is supported by the NSF Earth Sciences (EAR-1128799) and Department of Energy (DOE)—Geosciences (DE-FG02-94ER14466). Use of the Advanced Photon Source was supported by DOE under Contract No. DE-AC02-06CH11357. We would like to thank two reviewers for their constructive comments, which helped to improve the manuscript.
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Zhang, J.S., Hu, Y., Shelton, H. et al. Single-crystal X-ray diffraction study of Fe2SiO4 fayalite up to 31 GPa. Phys Chem Minerals 44, 171–179 (2017). https://doi.org/10.1007/s00269-016-0846-1
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DOI: https://doi.org/10.1007/s00269-016-0846-1