Application of general shear theory to the study of formation mechanism for the metamorphic core complex: A case of Xiaoqinling in central China

	Application of general shear theory to the study of formation mechanism for the metamorphic core complex: A case of Xiaoqinling in central China
	Zhang, JJ ; Zheng, YD ; Liu, SW
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2000-03-01
卷号	74 期号:1 页码:19-28
关键词	Xiaoqinling metamorphic core complex (XMCC) formation mechanism shear type magmatism PTt path
ISSN号	1000-9515
文献子类	Article
英文摘要	The kinematic vorticity number and strain of the mylonitic zone related to the detachment fault increase from ESE to WNW along the moving direction of the upper;plate of the Xiaoqinling metamorphic core complex (XMCC) and the geometry of quartz c-axis fabrics changes progressively from crossed girdles to single girdles in the same direction. Therefore, pure shear is dominant in the ESE part of the XMCC while simple shear becomes increasingly important towards WNW. However, the shear type does not change with the strain across the shear zone, thus the variation of shear type is of significance in indicating the formation mechanism. The granitic plutons within the XMCC came from the deep source and their emplacement was an active and forceful upwelling prior to the detachment faulting. The PTt path demonstrates that magmatism is an important cause for the formation of the XMCC. The formation mechanism of the XMCC is supposed to be active plutonism and passive detachment. Crustal thickening and magmatic doming caused necking extension with pure shear,and magmatic heating and doming resulted in detachment extension with simple shear and formed the XMCC.
WOS关键词	STRAIN ANALYSIS ; EXTENSIONAL TECTONICS ; MAGMATISM ; PROVINCE ; ARIZONA ; OROGEN
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000085807700004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/76099]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, JJ
作者单位	1.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China 2.Peking Univ, Dept Geol, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhang, JJ,Zheng, YD,Liu, SW. Application of general shear theory to the study of formation mechanism for the metamorphic core complex: A case of Xiaoqinling in central China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2000,74(1):19-28.
APA	Zhang, JJ,Zheng, YD,&Liu, SW.(2000).Application of general shear theory to the study of formation mechanism for the metamorphic core complex: A case of Xiaoqinling in central China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,74(1),19-28.
MLA	Zhang, JJ,et al."Application of general shear theory to the study of formation mechanism for the metamorphic core complex: A case of Xiaoqinling in central China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 74.1(2000):19-28.