Abstract
Using in situ strength measurements at pressures up to 10 GPa and at room temperature, 400, 600, and 700°C, we examined rheological properties of olivine, orthopyroxene, and chromian-spinel contained in a mantle-derived xenolith. Mineral strengths were estimated using widths of X-ray diffraction peaks as a function of pressure, temperature, and time. Differential stresses of all minerals increase with increasing pressure, but they decrease with increasing temperature because of elastic strain on compression and stress relaxation during heating. During compression at room temperature, all minerals deform plastically at differential stress of 4–6 GPa. During subsequent heating, thermally induced yielding is observed in olivine at 600°C. Neither orthopyroxene nor spinel shows complete stress relaxation, but both retain some stress even at 700°C. The strength of the minerals decreases in the order of chromian-spinel ≈ orthopyroxene > olivine for these conditions. This order of strength is consistent with the residual pressure of fluid inclusions in mantle xenoliths.
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Acknowledgments
Drs. Matsui M., Nishihara Y. and an anonymous reviewer provided thoughtful comments to improve the manuscript. We appreciate Y. Higo, F. Kurio, T. Sanehira, Y. Sueda and colleagues at Ehime University for their help in creating the pressure cell. This study was supported by a Grant-in-aid for the twenty-first Century COE Program for KAGI21 (Kyoto University, G3) and for Frontiers in Fundamental Chemistry, and by Grants-in-aid for Scientific Research (Nos. 13554018, 14654096, 15340190, 18740344 and 19GS0205) from the Japan Society for the Promotion of Science (JSPS) and JSPS Postdoctoral Fellowships for Research Abroad.
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Yamamoto, J., Ando, Ji., Kagi, H. et al. In situ strength measurements on natural upper-mantle minerals. Phys Chem Minerals 35, 249–257 (2008). https://doi.org/10.1007/s00269-008-0218-6
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DOI: https://doi.org/10.1007/s00269-008-0218-6