Temperature Coefficient of Sound Velocity of Perovskite-Enstatite and Lateral Thermal Heterogeneity in Earths Lower Mantle  

作　　者：GONG Zi-Zheng XIE Hong-Sen JING Fu-Qian LIU Yong-Gang GUO Jie XU Jian 龚自正;谢鸿森;经福谦;刘永刚;郭捷;徐济安(Material Laboratory of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002;Laboratory for Shock Waves and Detonation Physics Research,Southwest Institute of Fluid Physics,Chengdu 610003;Institute of Geosciences,Academia Sinica,Taipei 11529)

机构地区：[1]Material Laboratory of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002 [2]Laboratory for Shock Waves and Detonation Physics Research,Southwest Institute of Fluid Physics,Chengdu 610003 [3]Institute of Geosciences,Academia Sinica,Taipei 11529

出　　处：《Chinese Physics Letters》2000年第3期218-220,共3页中国物理快报（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No.19672058;the Science and Technology Foundation of Chinese Academy of Engineering Physics under Grant No.960103.

摘　　要：Using the differences of sound velocity and temperature on the Hugoniot and isoentropic state,the temperature coefficients of sound velocity of perovskite-enstatite under high pressure were obtained.For compressional,shear and bulk wave velocities,their temperature coefficients decrease from 0.386,0.251,0.255 m/(s·K)at 40 GPa to 0.197,0.131,0.162m/(S·K)at 140GPa,respectively.Extrapolating these to zero pressure results in(■K/■T)o=-0.0279 GPa·K^(-1),which is consistent very well with the value got by hydrostatic pressure experiment.On the basis of our data,we conclude that the compressional wave velocity anomaly of 0.1-0.2%in the deep lower mantle and 2%in the D″region would imply lateral thermal heterogeneity with amplitude of 53-106 K and 1066 K in these regions,respectively.

关 键 词：Lower MANTLE ANOMALY 

分 类 号：P31[天文地球—固体地球物理学]