Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院新生代地质与环境重点实验室

	Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen
	Li Yang 1; Liang WenTian 1; Jin ChunSheng 2; Dong YunPeng 1; Yuan HongLin 1; Zhang GuoWei 1
刊名	ACTA PETROLOGICA SINICA
	2017
卷号	33 期号:6 页码:1919-1933
关键词	Magnetic fabric Kinematic vorticity Microstructure Rock magnetism Shagoujie shear zone Qinling orogen
ISSN号	1000-0569
文献子类	Article
英文摘要	The Shagou shear zone, located in the Shangdan belt of East Qinling, is characterized by ductile deformation, which can contribute to constrain the Late Triassic tectonic setting of the Qinling orogen. In order to probe its kinematics and further to explore the dynamic mechanism, mylonite samples were analyzed in terms of anisotropy of magnetic susceptibility (AMS) and kinematic vorticity W-k) on the basis of the field observations and microstructural analyses. The values of mean susceptibility (K-m) show a wide variation range, which means that the ferromagnetic mineral like magnetite acted as the dominant magnetic carrier of the samples. The corrected anisotropy degree (P-J) are relatively large indicative of a strong structural deformation. Shape parameter (T) are generally more than zero, indicating that the susceptibility ellipsoid of the Shagoujie shear zone is mainly oblate. Magnetic fabrics, defined by AMS ellipsoids, is relatively well consistent with the mineral fabrics. Combined with the magnetic fabrics and the attitude of the boundary fault or the C-foliation, it can be concluded that the Shagoujie shear zone showing a sinistral transpressional kinematic. Furthermore, Wk and its distribution patterns reflect that the core of the Shagoujie shear zone is located in northern boundary fault, and it also demonstrates that pure shear component is the dominant shear force during the formation process of the Shagoujie shear zone. Taken together, the kinematics of the Shagoujie shear zone suggest that it was formed in a local transpressional setting under oblique convergence. What's more, Late Triassic bilateral extrusion tectonics of the Qinling orogen may explain the plain fact that the Shagoujie shear zone has a completely opposite kinematic with the coeval shear zone located in the western Shangdan belt.
WOS关键词	CHINA ; ANISOTROPY ; DEFORMATION ; STRAIN ; SUSCEPTIBILITY ; FLOW ; DIRECTION ; YUNNAN ; BELT ; AMS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000406212700018
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61844]
专题	地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者	Liang WenTian
作者单位	1.Northwest Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li Yang,Liang WenTian,Jin ChunSheng,et al. Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen[J]. ACTA PETROLOGICA SINICA,2017,33(6):1919-1933.
APA	Li Yang,Liang WenTian,Jin ChunSheng,Dong YunPeng,Yuan HongLin,&Zhang GuoWei.(2017).Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen.ACTA PETROLOGICA SINICA,33(6),1919-1933.
MLA	Li Yang,et al."Rock-magnetism, magnetic fabric and kinematic vorticity analysis of the Shagoujie shear zone, Qinling orogen".ACTA PETROLOGICA SINICA 33.6(2017):1919-1933.