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The compressibility of Fe- and Al-bearing phase D to 30 GPa

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Abstract

High-pressure in situ X-ray diffraction experiment of Fe- and Al-bearing phase D (Mg0.89Fe0.14Al0.25Si1.56H2.93O6) has been carried out to 30.5 GPa at room temperature using multianvil apparatus. Fitting a third-order Birch–Murnaghan equation of state to the P–V data yields values of V 0 = 86.10 ± 0.05 Å3; K 0 = 136.5 ± 3.3 GPa and K′ = 6.32 ± 0.30. If K′ is fixed at 4.0 K 0 = 157.0 ± 0.7 GPa, which is 6% smaller than Fe–Al free phase D reported previously. Analysis of axial compressibilities reveals that the c-axis is almost twice as compressible (K c  = 93.6 ± 1.1 GPa) as the a-axis (K a  = 173.8 ± 2.2 GPa). Above 25 GPa the c/a ratio becomes pressure independent. No compressibility anomalies related to the structural transitions of H-atoms were observed in the pressure range to 30 GPa. The density reduction of hydrated subducting slab would be significant if the modal amount of phase D exceeds 10%.

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Acknowledgments

We thank J. Bass, T. Shinmei and one anonymous reviewer for thorough reviews and corrections of the manuscript. We thank to S. Ghosh, H. Terasaki, K. Nishida and T. Sakamaki for assistance during experiments at ‘SPring-8’ and to T. Shinmei for data exchange prior to publication. This work was supported by the grants in Aid for Scientific Researches from the Ministry of Education, Culture, Sports, Science and Technology, Japan (No. 14102009 and 16075202), to EO and Vacate B grant from Japan Society for Promotion of Science (No. 17740344) to KL. This work was conducted under the Spring-8 proposal No 2005A0772-ND2b-np and is a part of the 21st Century Center-of-Excellence program ‘Advanced Science and Technology Center for the Dynamic Earth’ at Tohoku University.

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Authors and Affiliations

  1. Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan

    Konstantin D. Litasov, Eiji Ohtani & Akio Suzuki

  2. SPring-8, Japan Synchrotron Radiation Research Institute, Kouto, Hyogo, 678-5198, Japan

    Kenichi Funakoshi

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  1. Konstantin D. Litasov
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Correspondence to Konstantin D. Litasov.

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Litasov, K.D., Ohtani, E., Suzuki, A. et al. The compressibility of Fe- and Al-bearing phase D to 30 GPa. Phys Chem Minerals 34, 159–167 (2007). https://doi.org/10.1007/s00269-006-0136-4

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  • DOI: https://doi.org/10.1007/s00269-006-0136-4

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