典型文献
Anomalous elasticity of talc at high pressures:Implications for subduction systems
文献摘要：
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 Cii 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 subduc-tion systems.
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中图分类号：
作者姓名：
Ye Peng;Mainak Mookherjee;Andreas Hermann;Geeth Manthilake;David Mainprice
作者机构：
Earth Materials Laboratory,Department of Earth,Ocean,and Atmospheric Sciences,Florida State University,Tallahassee,FL 32306,USA;Centre for Science at Extreme Conditions and SUPA,School of Physics and Astronomy,The University of Edinburgh,Edinburgh EH9 3FD,UK;Laboratoire Magmas et Volcans CNRS,IRD,OPGC,Université Clermont Auvergne,63000 Clermont-Ferrand,France;Geosciences Montpellier,UMR CNRS 5243,Université de Montpellier,Montpellier 34095,France
文献出处：
引用格式：
[1]Ye Peng;Mainak Mookherjee;Andreas Hermann;Geeth Manthilake;David Mainprice-.Anomalous elasticity of talc at high pressures:Implications for subduction systems)[J].地学前缘（英文版）,2022(04):34-47
A类：
Cii,C66,polytypic,polytype,seismological,subduc
B类：
Anomalous,elasticity,talc,high,pressures,Implications,subduction,systems,Talc,layered,hydrous,silicate,mineral,that,plays,vital,role,transporting,water,into,Earth,interior,crucial,explaining,geophysical,observations,zone,settings,In,this,study,explored,structure,equation,state,both,triclinic,monoclinic,under,up,GPa,using,first,principles,simulations,density,functional,theory,corrected,dispersive,forces,Our,results,indicate,principal,components,full,constant,tensor,C22,shear,several,off,diagonal,dependence,This,monotonic,likely,related,structural,changes,manifested,transition,from,low,occurs,within,its,thermodynamic,stability,However,bulk,moduli,softening,also,shows,velocity,extremely,anisotropy,anomalously,VP,Vs,ratio,thus,making,potential,candidate,phase,could,readily,unusually,large,wave,splitting,delays,observed,studies,many
AB值：
0.559668
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