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

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[Formula: see text]2d (CaC₂O₅-C2-l) agree with wave velocity discontinuity at a depth of 660 km in the mantle transition zone. Moreover, when CaC_2<

SUBMITTER: Wang H 

PROVIDER: S-EPMC10811330 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature