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- W4221065317 endingPage "101381" @default.
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- W4221065317 abstract "Talc is a layered hydrous silicate mineral that plays a vital role in transporting water into Earth’s interior and is crucial for explaining geophysical observations in subduction zone settings. In this study, we explored the structure, equation of state, and elasticity of both triclinic and monoclinic talc under high pressures up to 18 GPa using first principles simulations based on density functional theory corrected for dispersive forces. Our results indicate that principal components of the full elastic constant tensor C11 and C22, shear components C66, and several off-diagonal components show anomalous pressure dependence. This non-monotonic pressure dependence of elastic constant components is likely related to the structural changes and is often manifested in a polytypic transition from a low-pressure polytype talc-I to a high-pressure polytype talc-II. The polytypic transition of talc occurs at pressures within its thermodynamic stability. However, the bulk and shear elastic moduli show no anomalous softening. Our study also shows that talc has low velocity, extremely high anisotropy, and anomalously high VP/VS ratio, thus making it a potential candidate mineral phase that could readily explain unusually high VP/VS ratio and large shear wave splitting delays as observed from seismological studies in many subduction systems." @default.
- W4221065317 created "2022-04-03" @default.
- W4221065317 creator A5021814225 @default.
- W4221065317 creator A5024698255 @default.
- W4221065317 creator A5031682758 @default.
- W4221065317 creator A5048305031 @default.
- W4221065317 creator A5089094177 @default.
- W4221065317 date "2022-07-01" @default.
- W4221065317 modified "2023-10-12" @default.
- W4221065317 title "Anomalous elasticity of talc at high pressures: Implications for subduction systems" @default.
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