Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature

doi:10.1360/02yd0437

	Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature
	Huang, XG ; Bai, WM ; Hu, JM
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2003-12-01
卷号	46 期号:12 页码:1212-1222
关键词	elastic wave velocity rheology amphibolite partial melting high temperature and high pressure
ISSN号	1006-9313
DOI	10.1360/02yd0437
文献子类	Article
英文摘要	Laboratory measurements of compressional-wave velocities and rheological properties are carried out on natural amphibolites collected from Chencai, Zhejiang Province at high pressures and high temperatures. The experiments of elastic wave velocity find that the compressional-wave velocities travel faster along the lineation(X-direction) within the foliation plane than those normal to the foliation (Z-direction). The velocity anisotropies are high for the amphibolites at 550 degreesC and pressure of 800 MPa or 600 MPa. Furthermore, the values of anisotropy and average velocity are respectively 7.83% and 6.77 km/s for the samples with fine grain size, 9.77% and 6.64 km/s for the samples with medium grain size. With increasing temperature at high static pressure, the wave velocities spreading along three structure directions in the samples all start to drop from 750 degreesC up. The rheological experiments also find that there is a marked strength reduction from 750 degreesC to 800 degreesC although the flow strength gradually decreases with increasing temperature for the fine-grained amphibolite at a confining pressure of 500 MPa and strain rate. of 1 x 10(-4) s(-1). Based on the results of microcopy observations, electronic probe analyses and infrared spectra analyses for some samples, the reduction of flow strength and wave velocity may be due to partial melting of amphibole above 750 degreesC. In addition, the rock deformations undergo from localized brittle fracture, semi-brittle deformation (cataclastic flow or semi-brittle faulting, semi-brittle flow) to homogeneous crystal-plastic flow from 600 degreesC to 1000 degreesC, confining pressure of 500 MPa and strain rate of 1 x 10(-4) s(-1).
WOS关键词	P-WAVE ; ROCKS ; ANISOTROPY ; VELOCITIES
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000186314200002
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78939]
专题	中国科学院地质与地球物理研究所
通讯作者	Huang, XG
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 2.Chinese Acad Geol Sci, Inst Geol Mech, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Huang, XG,Bai, WM,Hu, JM. Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2003,46(12):1212-1222.
APA	Huang, XG,Bai, WM,&Hu, JM.(2003).Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,46(12),1212-1222.
MLA	Huang, XG,et al."Experimental studies on elastic and rheological properties of amphibolites at high pressure and high temperature".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 46.12(2003):1212-1222.