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Structure and elasticity of CaC2O5 suggests carbonate contribution to the seismic anomalies of Earth’s mantle

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  • Hanyu Wang

    (China University of Geosciences
    Institute of Earthquake Forecasting, China Earthquake Administration)

  • Lei Liu

    (Institute of Earthquake Forecasting, China Earthquake Administration)

  • Zihan Gao

    (Institute of Earthquake Forecasting, China Earthquake Administration)

  • Longxing Yang

    (China University of Geosciences
    Institute of Earthquake Forecasting, China Earthquake Administration)

  • Gerile Naren

    (Institute of Earthquake Forecasting, China Earthquake Administration)

  • Shide Mao

    (China University of Geosciences)

Abstract

Knowledge of carbonate compounds under high pressure inside Earth is key to understanding the internal structure of the Earth, the deep carbon cycle and major geological events. Here we use first-principles simulations to calculate the structure and elasticity of CaC2O5-minerals with different symmetries under high pressure. Our calculations show that CaC2O5-minerals represent a group of low-density low-seismic-wave velocity mantle minerals. Changes in seismic wave velocity caused by the phase transformation of CaC2O5-Cc to CaC2O5-I $$\bar{4}$$ 4 ¯ 2d (CaC2O5-C2-l) agree with wave velocity discontinuity at a depth of 660 km in the mantle transition zone. Moreover, when CaC2O5-Fdd2 transforms into CaC2O5-C2 under 70 GPa, its shear wave velocity decreases by 7.4%, and its density increases by 5.8%, which is consistent with the characteristics of large low-shear-velocity provinces (LLSVPs). Furthermore, the shear wave velocity of CaC2O5-I $$\bar{4}$$ 4 ¯ 2d is very similar to that of cubic Ca-perovskite, which is one of the main constituents of the previously detected LLSVPs. Therefore, we propose that CaC2O5 and its high-pressure polymorphs may be a main component of LLSVPs.

Suggested Citation

  • Hanyu Wang & Lei Liu & Zihan Gao & Longxing Yang & Gerile Naren & Shide Mao, 2024. "Structure and elasticity of CaC2O5 suggests carbonate contribution to the seismic anomalies of Earth’s mantle," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-44925-9
    DOI: 10.1038/s41467-024-44925-9
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    References listed on IDEAS

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    1. A. R. Thomson & W. A. Crichton & J. P. Brodholt & I. G. Wood & N. C. Siersch & J. M. R. Muir & D. P. Dobson & S. A. Hunt, 2019. "Seismic velocities of CaSiO3 perovskite can explain LLSVPs in Earth’s lower mantle," Nature, Nature, vol. 572(7771), pages 643-647, August.
    2. Yanchao Wang & Meiling Xu & Liuxiang Yang & Bingmin Yan & Qin Qin & Xuecheng Shao & Yunwei Zhang & Dajian Huang & Xiaohuan Lin & Jian Lv & Dongzhou Zhang & Huiyang Gou & Ho-kwang Mao & Changfeng Chen , 2020. "Pressure-stabilized divalent ozonide CaO3 and its impact on Earth’s oxygen cycles," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    3. Masayuki Nishi & Yasuhiro Kuwayama & Jun Tsuchiya & Taku Tsuchiya, 2017. "The pyrite-type high-pressure form of FeOOH," Nature, Nature, vol. 547(7662), pages 205-208, July.
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