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In situ observations of phase changes in shock compressed forsterite

Newman, M. G. and Kraus, R. G. and Akin, M. C. and Bernier, J. V. and Dillman, A. M. and Homel, M. A. and Lee, S. and Lind, J. and Mosenfelder, J. L. and Pagan, D. C. and Sinclair, N. W. and Asimow, P. D. (2018) In situ observations of phase changes in shock compressed forsterite. Geophysical Research Letters, 45 (16). pp. 8129-8135. ISSN 0094-8276.

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Shockwave data on mineral‐forming compounds such as Mg2SiO4 are essential for understanding the interiors of Earth and other planets, but correct interpretation of these data depend on knowing the phase assemblage being probed at high pressure. Hence direct observations of the phase or phases making up the measured states along the forsterite Hugoniot are essential to assess whether kinetic factors inhibit the achievement of the expected equilibrium, phase‐separated assemblage. Previous shock recovery experiments on forsterite, which has orthorhombic space group Pbnm, show discrepant results as to whether forsterite undergoes segregation into its equilibrium phase assemblage of compositionally distinct structures upon shock compression. Here, we present the results of plate impact experiments on polycrystalline forsterite conducted at the Dynamic Compression Sector of the Advanced Photon Source. In situ x‐ray diffraction measurements were used to probe the crystal structure(s) in the shock state and to investigate potential decomposition into periclase and bridgmanite. In contrast to previous interpretations of the forsterite shock Hugoniot, we find that forsterite does not decompose, but instead reaches the forsterite III structure, which is a metastable structure of Mg_2SiO_4 with orthorhombic space group Cmc2_1.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemDataset
Newman, M. G.0000-0003-3088-1892
Kraus, R. G.0000-0003-2752-0121
Akin, M. C.0000-0001-5742-8663
Homel, M. A.0000-0002-0399-0092
Sinclair, N. W.0000-0001-9689-8983
Asimow, P. D.0000-0001-6025-8925
Additional Information:© 2018 American Geophysical Union. Manuscript received: 19 March 2018. Manuscript revised: 03 July 2018. Manuscript accepted: 05 July 2018. Accepted manuscript online: 11 July 2018. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. MGN, MCA, and RGK acknowledge support under w under grant number 15-ERD-012. MCA, JVB, DCP, JL, and MAH acknowledge support under LLNL LDRD 16-ERD-010. Portions of this work were performed at GeoSoilEnviroCARS (The University of Chicago, Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation - Earth Sciences (EAR-1634415) and Department of Energy- GeoSciences (DE-FG02-94ER14466). This publication is based upon work performed at the Dynamic Compression Sector, which is operated by Washington State University under the U.S. Department of Energy (DOE)/National Nuclear Security Administration award no. DE-NA0002442. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. JLM acknowledges support from NSF EAR-1161023. The data used to generate this report is stored in the Caltech authors repository and can be accessed at This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Livermore National Security, LLC, and shall not be used for advertising or product endorsement purposes.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC52-07NA27344
Lawrence Livermore National Laboratory15-ERD-012
Lawrence Livermore National Laboratory16-ERD-010
Department of Energy (DOE)DE-FG02-94ER14466
Department of Energy (DOE)DE-NA0002442
Department of Energy (DOE)DE-AC02-06CH11357
Subject Keywords:forsterite; shock compression; x‐ray diffraction
Issue or Number:16
Record Number:CaltechAUTHORS:20180712-094708360
Persistent URL:
Official Citation:Newman, M. G., Kraus, R. G., Akin, M. C., Bernier, J. V., Dillman, A. M., Homel, M. A., et al. (2018). In situ observations of phase changes in shock compressed forsterite. Geophysical Research Letters, 45, 8129–8135.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87799
Deposited By: George Porter
Deposited On:12 Jul 2018 20:25
Last Modified:03 Oct 2019 19:59

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