Reflection attributes of paragneiss in the upper crust

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	Reflection attributes of paragneiss in the upper crust
	Yang, WC (Yang WenCai); Xu, ZQ (Xu ZhiQin); Yu, CQ (Yu ChangQing)
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2008
卷号	51 期号:1 页码:1-10
关键词	seismic reflection method metamorphic basement paragneiss crust reflectors
ISSN号	1006-9313
英文摘要	The integrated study of the geological and seismic reflection data from the drilling area of CCSD has discovered that the density and the P-wave velocity of orthogneiss are almost the same as that of the paragneiss in the area; but the orthogneiss and the paragneiss hold different reflection attributes. The strong seismic reflector packes coinciding spatially with the paragneiss suites have implied that the paragneiss buried in the metamorphic crust itself can cause bone-like seismic reflector sets. The P-wave velocity of paragneiss shows little apparent difference with that of the orthogneiss; but its transverse wave velocity is lower, with the V-p/V (s) ratios being high. The paragneiss has partially inherited the layering structures and textures of the protolithe of sedimentary rocks, hence shows strong heterogeneity and anisotropy, that is why the paragneiss are able to produce the bone-like reflectors in the upper crust. The low transverse wave velocity of paragneiss often means weak shear resistance, which will further cause cracks or fractures in the rock, consequentially increase its porosity and permeability during tectonic movements, and form the paragneiss reservoirs of low-permeability zones for gases uplifted from the deeper crust. Because the paragneiss in the crustal metamorphic basement can cause the seismic reflectors, seismic reflection sections are able to provide information about the paragneiss under certain prerequisites.
学科主题	变质岩岩石学
WOS关键词	PRESSURE METAMORPHIC BELT ; SCIENTIFIC DRILLING SITE ; SEISMIC REFLECTORS ; EASTERN CHINA ; CALIBRATION ; TERRANE ; PROFILE ; CCSD
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000251412300001
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38682]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yang, WC ,Xu, ZQ ,Yu, CQ . Reflection attributes of paragneiss in the upper crust[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2008,51(1):1-10.
APA	Yang, WC ,Xu, ZQ ,&Yu, CQ .(2008).Reflection attributes of paragneiss in the upper crust.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,51(1),1-10.
MLA	Yang, WC ,et al."Reflection attributes of paragneiss in the upper crust".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 51.1(2008):1-10.