Kinematics and geochronology of multistage ductile deformation along the;eastern Alxa block, NW China: New constraints on the relationship;between the North China Plate and the Alxa block

doi:10.1016/j.jsg.2013.10.002

	Kinematics and geochronology of multistage ductile deformation along the;eastern Alxa block, NW China: New constraints on the relationship;between the North China Plate and the Alxa block
	Zhang, Jin 4; Li, Jinyi ; Xiao, Wenxia 1; Wang, Yannan 2; Qi, Wenhua 2
刊名	JOURNAL OF STRUCTURAL GEOLOGY
	2013
卷号	57 页码:38-57
关键词	Alxa block North China Plate Ductile thrust Sinistral ductile shear Triassic
ISSN号	0191-8141
DOI	10.1016/j.jsg.2013.10.002
英文摘要	The NE-trending Bayanwula Shan-Lang Shan is an important tectonic belt lying between the North China Plate (NCP) to the east and the Alxa block to the west. An understanding of its nature and the timing of deformation are essential to understand the relationship between the NCP and the Alxa block. Two phases of ductile deformation have been observed in this belt. Large-scale top-to-the-west ductile thrusting characterized the early deformation in the Bayanwula Shan-Lang Shan. Nearly east-west trending quartz stretching lineations and lineations formed by amphibole and biotite are well developed. Different types of sheath and oblique folds with east-west trending fold hinges are also developed in the region. The shear strain of this ductile thrust is up to 17. The ductile deformation may have resulted from the top-to-the-west thrusting of the northern part of the NCP over the Alxa block, and may have occurred ca. 351 Ma (biotite Ar-40/Ar-39 age). Later ductile deformation was expressed as NE-trending sinistral shear along the entire Bayanwula Shan-Lang Shan and likely occurred ca. 250 Ma (biotite and muscovite Ar-40/Ar-39 ages); this shear may have resulted from the collision between the Yangtze and North China plates to the south during the Triassic. Combined with recently obtained detrital zircon U-Pb ages for the area, the ductile deformation events in the eastern Alxa block indicate that the block may not have been part of the NCP, at least before the end of the Devonian. Both blocks were located in the Paleo-Asian Ocean during the Paleozoic and collided or amalgamated with each other at the end of the Devonian. (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	构造地质学
WOS关键词	DETRITAL-ZIRCON GEOCHRONOLOGY ; U-PB AGES ; CENTRAL-ASIA ; SHEATH FOLDS ; TECTONIC EVOLUTION ; SOUTHERN MONGOLIA ; PALEOPROTEROZOIC EVOLUTION ; CATACLASTIC DEFORMATION ; STRUCTURAL-ANALYSIS ; SEDIMENTARY RECORD
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000328872500003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40127]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.China Natl Petr Corp, Geophys Co Ltd, Dept Chang Qing Geophys Survey, Xian 710021, Peoples R China. 3.Chinese Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, Jin,Li, Jinyi,Xiao, Wenxia,et al. Kinematics and geochronology of multistage ductile deformation along the;eastern Alxa block, NW China: New constraints on the relationship;between the North China Plate and the Alxa block[J]. JOURNAL OF STRUCTURAL GEOLOGY,2013,57:38-57.
APA	Zhang, Jin,Li, Jinyi,Xiao, Wenxia,Wang, Yannan,&Qi, Wenhua.(2013).Kinematics and geochronology of multistage ductile deformation along the;eastern Alxa block, NW China: New constraints on the relationship;between the North China Plate and the Alxa block.JOURNAL OF STRUCTURAL GEOLOGY,57,38-57.
MLA	Zhang, Jin,et al."Kinematics and geochronology of multistage ductile deformation along the;eastern Alxa block, NW China: New constraints on the relationship;between the North China Plate and the Alxa block".JOURNAL OF STRUCTURAL GEOLOGY 57(2013):38-57.