Anomalous elasticity of talc at high pressures: Implications for subduction systems

Ye Peng; Mainak Mookherjee; Andreas Hermann; Geeth Manthilake; David Mainprice

doi:10.1016/j.gsf.2022.101381

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Ye Peng, Mainak Mookherjee, Andreas Hermann, Geeth Manthilake, David Mainprice. Anomalous elasticity of talc at high pressures: Implications for subduction systems[J]. Geoscience Frontiers, 2022, 13(4): 101381. doi: 10.1016/j.gsf.2022.101381

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Ye Peng, Mainak Mookherjee, Andreas Hermann, Geeth Manthilake, David Mainprice. Anomalous elasticity of talc at high pressures: Implications for subduction systems[J]. Geoscience Frontiers, 2022, 13(4): 101381. doi: 10.1016/j.gsf.2022.101381

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Anomalous elasticity of talc at high pressures: Implications for subduction systems

doi: 10.1016/j.gsf.2022.101381

a Earth Materials Laboratory, Department of Earth, Ocean, and Atmospheric Sciences, Florida State University, Tallahassee, FL 32306, USA;
b Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, UK;
c Laboratoire Magmas et Volcans CNRS, IRD, OPGC, Université Clermont Auvergne, 63000 Clermont-Ferrand, France;
d Geosciences Montpellier, UMR CNRS 5243, Université de Montpellier, Montpellier 34095, France

Funds:

gion Auvergne, and the European Regional Development Fund (ClerVolc contribution number 530).

This work is supported by the US National Science Foundation grant EAR 1763215 and EAR 1753125. YP and MM acknowledge computing resources from XSEDE facilities (GEO170003) and the High-Performance Computing, Research Computing Center, Florida State University. AH acknowledges computing resources from the UK’s National Supercomputer Service through the UK Car-Parrinello Consortium (EPSRC Grant No. EP/P022561/1) and project ID d56 “Planetary Interiors”. GM acknowledges funding from the INSU-CNRS and the French Government Laboratory of Excellence initiative n°

ANR-10-LABX-0006, the Ré

Received Date: 2021-09-09
Accepted Date: 2022-03-11
Rev Recd Date: 2022-02-04
Publish Date: 2022-03-15

Abstract

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 V_P/V_S ratio, thus making it a potential candidate mineral phase that could readily explain unusually high V_P/V_S ratio and large shear wave splitting delays as observed from seismological studies in many subduction systems.
- Talc,
- Elasticity,
- Seismic anisotropy,
- Hydrous minerals,
- Subduction zone

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References(105)

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