Palaeomagnetic constraints from granodioritic plutons (Jiaodong Peninsula): New insights on Late Mesozoic continental extension in Eastern Asia

doi:10.1016/j.pepi.2011.05.006

	Palaeomagnetic constraints from granodioritic plutons (Jiaodong Peninsula): New insights on Late Mesozoic continental extension in Eastern Asia
	Charles, Nicolas 1; Chen, Yan 1; Augier, Romain 1; Gumiaux, Charles 1; Lin, Wei 2; Faure, Michel 1; Monie, Patrick 3; Choulet, Flavien 1; Wu, Fuyuan 2; Zhu, Rixiang 2
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2011-08-01
卷号	187 期号:3-4 页码:276-291
关键词	Eastern China Late Mesozoic extension Palaeomagnetism Granitic pluton Magnetic remanent age Cretaceous Shandong Peninsula
ISSN号	0031-9201
DOI	10.1016/j.pepi.2011.05.006
文献子类	Article
英文摘要	Mechanism and kinematics of the Late Mesozoic continental extension event of Eastern Asia are still debated. In order to better constrain its evolution, two granodioritic plutons of the Jiaodong Peninsula have been chosen as targets for a time-constrained palaeomagnetic study. Indeed, plutons are devoid of visible deformation, did not experience rotation along horizontal axis and are precisely dated by U/Pb and Ar-40/Ar-39 methods. Multidomain (MD) magnetite has been identified as the principal magnetic remanent carrier. The interpolation of existing and new U/Pb and Ar-40/Ar-39 ages revealed that characteristic remanent magnetisation was acquired in a narrow range of 116 +/- 2 Ma. Twenty out of 27 sites present stable magnetic directions calculated from high-temperature or high-coercive components. The observations of the solo normal magnetic polarity for this palaeomagnetic collection and of the magnetic remanent age consistent with the Cretaceous Normal Superchron (CNS) argue that the characteristic magnetic remanence may be considered as primary. Detailed field observations of the intrusive relationship between the plutons and country rocks and Anisotropy of Magnetic Susceptibility (AMS) study reveal the absence of the subsequent deformation of plutons, or rigid rotation of plutons along a horizontal axis. Two palaeomagnetic poles have been therefore calculated from these plutons. Among 12 out 15 Cretaceous palaeomagnetic poles, including the two new poles provided by this study, from the Jiaodong Peninsula and on both sides of Tan-Lu and Muping-Jimo faults are statistically consistent. As a result, the Jiaodong Peninsula behaved as a rigid block as internal deformation appears negligible. The remaining three derived poles are probably due to the secular variation or/and the vicinity of fault zones near of the palaeomagnetic sampling site. Thus, they can not be applied to the peninsula-scaled tectonics. Comparison of these time-constrained Cretaceous palaeomagnetic results of the Jiaodong Peninsula with those of North China Block (NCB) indicate that the Jiaodong Peninsula was rigidly attached to NCB since, at least, the Cretaceous as residual difference is clearly insignificant with respect to the error brackets. These new palaeomagnetic results confirm that the relative clockwise (CW) rotation of Eastern Liaoning-Korea Block (ELKB) with respect to NCB does not affect the Jiaodong Peninsula as a rigid block, nevertheless, some tectonic structures have been reactivated since Cenozoic and local rotations could be produced. This palaeomagnetic study reveals that the Late Mesozoic extension in Eastern Asia is heterogeneously expressed in time and space. The complete understanding of the mechanism(s) of this extensional event needs further multidisciplinary investigations. (C) 2011 Elsevier B.V. All rights reserved.
WOS关键词	METAMORPHIC CORE COMPLEX ; NORTH CHINA BLOCK ; TAN-LU FAULT ; U-PB ZIRCON ; SINO-KOREAN CRATON ; POLAR WANDER PATH ; SOUTH CHINA ; NE CHINA ; TECTONIC IMPLICATIONS ; SHANDONG PROVINCE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000296207900016
资助机构	French national "Failles-Fluides-Flux", INSU-CNRS ; French national "Failles-Fluides-Flux", INSU-CNRS ; NSFC(90714007 ; NSFC(90714007 ; (KZCX2-YW-Q05-05-03) ; (KZCX2-YW-Q05-05-03) ; 40730315) ; 40730315) ; French national "Failles-Fluides-Flux", INSU-CNRS ; French national "Failles-Fluides-Flux", INSU-CNRS ; NSFC(90714007 ; NSFC(90714007 ; (KZCX2-YW-Q05-05-03) ; (KZCX2-YW-Q05-05-03) ; 40730315) ; 40730315) ; French national "Failles-Fluides-Flux", INSU-CNRS ; French national "Failles-Fluides-Flux", INSU-CNRS ; NSFC(90714007 ; NSFC(90714007 ; (KZCX2-YW-Q05-05-03) ; (KZCX2-YW-Q05-05-03) ; 40730315) ; 40730315) ; French national "Failles-Fluides-Flux", INSU-CNRS ; French national "Failles-Fluides-Flux", INSU-CNRS ; NSFC(90714007 ; NSFC(90714007 ; (KZCX2-YW-Q05-05-03) ; (KZCX2-YW-Q05-05-03) ; 40730315) ; 40730315)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74772]
专题	中国科学院地质与地球物理研究所
通讯作者	Charles, Nicolas
作者单位	1.Univ Orleans, CNRS INSU, UMR6113, ISTO, F-45071 Orleans 2, France 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100021, Peoples R China 3.Univ Montpellier 2, CNRS, UMR5243, F-34095 Montpellier 5, France
推荐引用方式 GB/T 7714	Charles, Nicolas,Chen, Yan,Augier, Romain,et al. Palaeomagnetic constraints from granodioritic plutons (Jiaodong Peninsula): New insights on Late Mesozoic continental extension in Eastern Asia[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2011,187(3-4):276-291.
APA	Charles, Nicolas.,Chen, Yan.,Augier, Romain.,Gumiaux, Charles.,Lin, Wei.,...&Wang, Qingchen.(2011).Palaeomagnetic constraints from granodioritic plutons (Jiaodong Peninsula): New insights on Late Mesozoic continental extension in Eastern Asia.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,187(3-4),276-291.
MLA	Charles, Nicolas,et al."Palaeomagnetic constraints from granodioritic plutons (Jiaodong Peninsula): New insights on Late Mesozoic continental extension in Eastern Asia".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 187.3-4(2011):276-291.