Possible southwestward extrusion of the Ordos Block in the Late Paleoproterozoic: Constraints from kinematic and geochronologic analysis of peripheral ductile shear zones

doi:10.1016/j.precamres.2014.05.001

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	Possible southwestward extrusion of the Ordos Block in the Late Paleoproterozoic: Constraints from kinematic and geochronologic analysis of peripheral ductile shear zones
	Gong, Wangbin 1; Hu, Jianmin 1; Wu, Sujuan 1; Chen, Hong 1; Qu, Hongjie 1; Li, Zhenhong 1; Liu, Yang 2; Wang, Lijun 3
刊名	PRECAMBRIAN RESEARCH
	2014
卷号	255 页码:716-733
关键词	Southwestward extrusion Ordos Block North China Craton Ductile shear zone Late Paleoproterozoic Ar-40/Ar-39 dating
ISSN号	0301-9268
DOI	10.1016/j.precamres.2014.05.001
英文摘要	The Paleoproterozoic is a pivotal period of the tectonic evolution of the North China Craton (NCC). Various models have been postulated by previous researchers through the study of petrology and metamorphism, but the lack of structural analyses has hampered further understanding of the tectonic evolution of the NCC. A series of well-exposed ductile shear zones developed on the northern, northwestern and eastern edges of the Ordos Block in the western part of the NCC. We carried out detailed field studies along with isotopic dating focused on the kinematics and geochronology of the ductile shear zones. On the north margin of the Ordos block, the Wulashan-Daqingshan ductile shear zone is characterized by an E-W trending shearing foliation that steeply dips 75-80 degrees to the north or south, with subhorizontal stretching lineation plunging 10-15 degrees toward the east or west and dextral strike-slip shearing kinematics. On the west margin of the Ordos block is the Zongbieli ductile shear zone with top-to-the-NW thrusting kinematics. On the east margin of the Ordos block is the Xueling ductile shear zone with top-to-the-SE thrusting accompanied by sinistral strike-slip shearing kinematics. The Ar-40-Ar-39 ages of deformed minerals from mylonitic high-grade metamorphic rocks and LA-ICP-MS U-Pb dating results of zircons from syn-tectonic anatectic granites reflect that the ductile shear zones surrounding the Ordos block deformed between 1.85 and 1.81 Ga. The similar deformation ages indicate that the ductile shear zones might be genetically correlated. The geometry, kinematics and geochronology characteristics of the Wulashan-Daqingshan ductile shear zone on the north margin, the Zongbieli ductile shear zone on the west margin, and the Xueling ductile shear zone combined with the Zhujiafang sinistral ductile shear zone on the east margin defined the possible southwestward extrusion of the Ordos block in the late Paleoproterozoic, which might have resulted from the westward subduction-collision of the Eastern Block under the Western Block at approximately 1.85 Ga and which is correlated with the amalgamation of the Columbia supercontinent. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	前寒武纪地质
WOS关键词	NORTH CHINA CRATON ; PB ZIRCON GEOCHRONOLOGY ; LIAO-JI BELT ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; U-PB ; COLUMBIA SUPERCONTINENT ; TECTONIC EVOLUTION ; WESTERN BLOCK ; EASTERN BLOCK ; T PATH
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000348011600013
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41050]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 2.Minist Land & Resources, Key Lab Paleomagnetism & Tecton Reconstruct, Beijing 100081, Peoples R China 3.Kunming Univ Sci & Technol, Kunming 650093, Peoples R China 4.Shandong Univ Sci & Technol, Qingdao 266510, Peoples R China
推荐引用方式 GB/T 7714	Gong, Wangbin,Hu, Jianmin,Wu, Sujuan,et al. Possible southwestward extrusion of the Ordos Block in the Late Paleoproterozoic: Constraints from kinematic and geochronologic analysis of peripheral ductile shear zones[J]. PRECAMBRIAN RESEARCH,2014,255:716-733.
APA	Gong, Wangbin.,Hu, Jianmin.,Wu, Sujuan.,Chen, Hong.,Qu, Hongjie.,...&Wang, Lijun.(2014).Possible southwestward extrusion of the Ordos Block in the Late Paleoproterozoic: Constraints from kinematic and geochronologic analysis of peripheral ductile shear zones.PRECAMBRIAN RESEARCH,255,716-733.
MLA	Gong, Wangbin,et al."Possible southwestward extrusion of the Ordos Block in the Late Paleoproterozoic: Constraints from kinematic and geochronologic analysis of peripheral ductile shear zones".PRECAMBRIAN RESEARCH 255(2014):716-733.