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Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones

Author

Listed:
  • Mingqiang Hou

    (Center for High Pressure Science and Technology Advanced Research
    Lawrence Berkeley National Laboratory)

  • Qian Zhang

    (Center for High Pressure Science and Technology Advanced Research)

  • Renbiao Tao

    (Carnegie Institution of Washington)

  • Hong Liu

    (Institute of Earthquake Science, China Earthquake Administration)

  • Yoshio Kono

    (Carnegie Institution of Washington
    Ehime University)

  • Ho-kwang Mao

    (Center for High Pressure Science and Technology Advanced Research
    Carnegie Institution of Washington)

  • Wenge Yang

    (Center for High Pressure Science and Technology Advanced Research)

  • Bin Chen

    (Center for High Pressure Science and Technology Advanced Research)

  • Yingwei Fei

    (Carnegie Institution of Washington)

Abstract

Calcium carbonate (CaCO3) significantly affects the properties of upper mantle and plays a key role in deep carbon recycling. However, its phase relations above 3 GPa and 1000 K are controversial. Here we report a reversible temperature-induced aragonite-amorphization transition in CaCO3 at 3.9–7.5 GPa and temperature above 1000 K. Amorphous CaCO3 shares a similar structure as liquid CaCO3 but with much larger C-O and Ca-Ca bond lengths, indicating a lower density and a mechanism of lattice collapse for the temperature-induced amorphous phase. The less dense amorphous phase compared with the liquid provides an explanation for the observed CaCO3 melting curve overturn at about 6 GPa. Amorphous CaCO3 is stable at subduction zone conditions and could aid the recycling of carbon to the surface.

Suggested Citation

  • Mingqiang Hou & Qian Zhang & Renbiao Tao & Hong Liu & Yoshio Kono & Ho-kwang Mao & Wenge Yang & Bin Chen & Yingwei Fei, 2019. "Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09742-5
    DOI: 10.1038/s41467-019-09742-5
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