Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China

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	Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China
	Wang, XS (Wang XinShe); Zheng, YD (Zheng YaDong); Wang, T (Wang Tao)
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2007
卷号	50 期号:4 页码:487-495
关键词	ductile shear zone strain path kinematic vorticity shear type Chifeng
ISSN号	1006-9313
英文摘要	The Louzidian ductile shear zone at the south of Chifeng strikes NE-SW and dips SE at low-medium-angles. This ductile shear zone is mainly composed of granitic mylonite, which grades structurally upward into a chloritized zone, a microbreccia zone, a brittle fault and a gouge zone. All these zones share similar planar attitudes, but contain different linear attitudes and kinematic indicators. Finite strain measurements were performed on feldspar porphyroclasts using the Fry method. These measurements yield Fulin indexes of 1.25-3.30, Lode's parameters of -0.535--0.112 and strain parameters of 0.41-0.75 for the protomylonite, respectively. These data are plotted within the apparent constrictional field in Fulin and Hossack diagrams. In contrast, for the mylonite, corresponding parameters are 0.99-1.43, -0.176--0.004 and 0.63-0.82, respectively, and located in the apparent constrictional field close to the plane strain. The mean kinematic vorticity numbers of the protomylonite and mylonite by using three methods of polar Mohr circle, porphyroclast hyperbolic and oblique foliation, are in the range of 0.67-0.95, suggesting that the ductile shearing is accommodated by general shearing that is dominated by simple shear. Combination of the finite strain and kinematic vorticity indicates that shear type was lengthening shear and resulted in L-tectonite at the initial stage of deformation and the shear type gradually changed into lengthening-thinning shear and produced L-S-tectonite with the uplifting of the shear zone and accumulating of strain. These kinds of shear types only produce a/ab strain facies, so the lineation in the ductile shear zone could not deflect 90 degrees in the progressively deformation.
学科主题	构造地质学
WOS关键词	METAMORPHIC CORE COMPLEX ; EXTENSION ; ROCKS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000246273300002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38489]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China Peking Univ, Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, XS ,Zheng, YD ,Wang, T . Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2007,50(4):487-495.
APA	Wang, XS ,Zheng, YD ,&Wang, T .(2007).Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,50(4),487-495.
MLA	Wang, XS ,et al."Strain and shear types of the Louzidian ductile shear zone in southern Chifeng, Inner Mongolia, China".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 50.4(2007):487-495.