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Atomistic insight into viscosity and density of silicate melts under pressure

Author

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  • Yanbin Wang

    (Center for Advanced Radiation Sources, The University of Chicago)

  • Tatsuya Sakamaki

    (Center for Advanced Radiation Sources, The University of Chicago
    Present address: Department of Earth and Planetary Materials Science, Tohoku University, Sendai 980-8578, Japan)

  • Lawrie B. Skinner

    (Mineral Physics Institute, Stony Brook University)

  • Zhicheng Jing

    (Center for Advanced Radiation Sources, The University of Chicago
    Present address: Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, Ohio 44106, USA)

  • Tony Yu

    (Center for Advanced Radiation Sources, The University of Chicago)

  • Yoshio Kono

    (HPCAT, Geophysical Laboratory, Carnegie Institution of Washington)

  • Changyong Park

    (HPCAT, Geophysical Laboratory, Carnegie Institution of Washington)

  • Guoyin Shen

    (HPCAT, Geophysical Laboratory, Carnegie Institution of Washington)

  • Mark L. Rivers

    (Center for Advanced Radiation Sources, The University of Chicago)

  • Stephen R. Sutton

    (Center for Advanced Radiation Sources, The University of Chicago)

Abstract

A defining characteristic of silicate melts is the degree of polymerization (tetrahedral connectivity), which dictates viscosity and affects compressibility. While viscosity of depolymerized silicate melts increases with pressure consistent with the free-volume theory, isothermal viscosity of polymerized melts decreases with pressure up to ~3–5 GPa, above which it turns over to normal (positive) pressure dependence. Here we show that the viscosity turnover in polymerized liquids corresponds to the tetrahedral packing limit, below which the structure is compressed through tightening of the inter-tetrahedral bond angle, resulting in high compressibility, continual breakup of tetrahedral connectivity and viscosity decrease with increasing pressure. Above the turnover pressure, silicon and aluminium coordination increases to allow further packing, with increasing viscosity and density. These structural responses prescribe the distribution of melt viscosity and density with depth and play an important role in magma transport in terrestrial planetary interiors.

Suggested Citation

  • Yanbin Wang & Tatsuya Sakamaki & Lawrie B. Skinner & Zhicheng Jing & Tony Yu & Yoshio Kono & Changyong Park & Guoyin Shen & Mark L. Rivers & Stephen R. Sutton, 2014. "Atomistic insight into viscosity and density of silicate melts under pressure," Nature Communications, Nature, vol. 5(1), pages 1-10, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4241
    DOI: 10.1038/ncomms4241
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    Cited by:

    1. Suraj K. Bajgain & Aaron Wolfgang Ashley & Mainak Mookherjee & Dipta B. Ghosh & Bijaya B. Karki, 2022. "Insights into magma ocean dynamics from the transport properties of basaltic melt," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Nguyen Yen & Emmanuel L. C. VI M. Plan & Pham Huu Kien & Anh Tien Nguyen & Nguyen Hong & Haidang Phan, 2022. "Topological structural analysis and dynamical properties in MgSiO3 liquid under compression," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(4), pages 1-11, April.

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