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Viscosity of silicate melts in CaMgSi2O6–NaAlSi2O6 system at high pressure

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Abstract

In situ X-ray viscometry of the silicate melts was carried out at high pressure and at high temperature. The viscosity of the silicate melts in the diopside(Di)–jadeite(Jd) system was determined in the pressure range from 1.88 GPa to 7.9 GPa and in the temperature range from 2,003 K to 2,173 K. The viscosity of the Di 25%–Jd 75% melt decreases continuously to 5.0 GPa, whereas the viscosity of the Di 50%–Jd 50% melt increases over 3.5 GPa. The viscosity of the Di50%–Jd 50% melt reaches a minimum around 3.5 GPa. Since the amounts of silicon in the two melts are the same, the difference in the pressure dependence of the viscosity may be controlled by another network-forming element, i.e., aluminum. The difference in the pressure dependence of the viscosities in the melts with two intermediate compositions in the Di–Jd system is estimated to be due to the difference in the melt structures at high pressures and high temperatures.

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Acknowledgments

In situ X-ray viscosity measurements were carried out at SPring-8 (Proposal number; 1999B0156-ND-np and 2000A0220-ND-np). This work was supported partially by a Grant-in-Aid for the Scientific Research of Ministry of Education, Culture, Sport, Science and Technology of Japanese Government (No. 15740312) to A. Suzuki. The authors are grateful for the technical assistance of M. Maeda, J. Sato, T. Kubo and T. Okada during the experiments at SPring-8.

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Authors and Affiliations

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

    Akio Suzuki, Eiji Ohtani & Hidenori Terasaki

  2. Japan Synchrotron Radiation Research Institute (JASRI), Mikazuki-cho, Sayo-gun, Hyogo, 679-5198, Japan

    Ken-ichi Funakoshi

Authors
  1. Akio Suzuki
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  2. Eiji Ohtani
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  3. Hidenori Terasaki
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  4. Ken-ichi Funakoshi
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Correspondence to Akio Suzuki.

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Suzuki, A., Ohtani, E., Terasaki, H. et al. Viscosity of silicate melts in CaMgSi2O6–NaAlSi2O6 system at high pressure. Phys Chem Minerals 32, 140–145 (2005). https://doi.org/10.1007/s00269-005-0452-0

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  • DOI: https://doi.org/10.1007/s00269-005-0452-0

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