华北地区韧性剪切带几种岩石的波速各向异性高温高压实验研究  

THE EXPERIMENTAL STUDY OF P-WAVE VELOCITY ANISOTROPY OF MYLONITE AND IT'S SURROUNDING ROCKS PROM DUCTILE SHEAR ZONES OF NORTH-CHINA AT ELEVATED PRESSURES AND TEMPERATURES

作　　者：母润昌 高平[1] 刘若新[1] 马宝林[1] 

机构地区：[1]国家地震局地质研究所

出　　处：《地球物理学报》1995年第2期213-220,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：对华北地区韧性剪切带几种代表上、中、下地壳深度的糜棱岩及其围岩在高温高压条件下进行纵波速度测定及各向异性研究．对实验样品的纵波速度测定得到以下结果：１．沿糜棱岩面理方向的纵波速度大于与面理垂直方向的纵波速度，差值为０．１５—０．３０ｋｍ／ｓ，各向异性为３％—５％；２．糜棱岩的纵波速度低于其围岩的纵波速度，差值为０．１０—０．４５ｋｍ／ｓ；３．中地壳角闪岩相糜棱岩的纵波速度各向异性高于上地壳绿片岩相糜棱岩和下地壳麻粒岩相糜棱岩的各向异性；４．地震波速各向异性与糜棱岩矿物优选定向有关．We have undertaken an experinental study of compressional-wave velocity and It's anisotropy of mylonite and it's surrounding rocks from North-China at high pressure and temperature.The laboratory results indicate that;1.The Vp Within the foliation plane of mylonite is 0.15 0.30km/s.more than the Vp parallel to the normal of the foliation.Vp anisotropy is 3%-5%.2.The P-wave velocity of mylonite is 0.15-0.45km/s lower than the P-wave velocity of it's surrounding rocks. 3.The velocity anisotropy of amphibolite fades mylonite is more than the anisotropy of greenschist and granulite fades mylonite.4.The anisotropyls clearlyrelated to the mylonite fabric.The lattic prefferred orientation has effect on the seismic velocity anisotropy.

关 键 词：高温 高压 剪切带 各向异性 岩石 波速 

分 类 号：P584[天文地球—岩石学]