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

Mingqiang Hou (), Qian Zhang, Renbiao Tao, Hong Liu, Yoshio Kono, Ho-kwang Mao, Wenge Yang, Bin Chen and Yingwei Fei
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Mingqiang Hou: Center for High Pressure Science and Technology Advanced Research
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
Ho-kwang Mao: Center for High Pressure Science and Technology Advanced Research
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

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09742-5

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