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DOI	10.1016/j.tecto.2012.08.017
	The Biluoxueshan transpressive deformation zone monitored by synkinematic plutons, around the Eastern Himalayan Syntaxis
	Zhang, Bo; Zhang, Jinjiang; Chang, Zufeng; Wang, Xiaoxian; Cai, Fulong; Lai, Qingzhou
通讯作者	Zhang, B (通讯作者)
发表日期	2012
ISSN	0040-1951
EISSN	1879-3266
起始页码	158
结束页码	180
卷号	574
英文摘要	The Biluoxueshan deformation zone is an Early Eocene dextral transpressive zone located around the Eastern Himalayan Syntaxis, and it consists mainly of granite, mylonitic granite, mylonitic gneiss, and schist. Structural evidence indicates that the granitic plutons were emplaced into the zone as subvertical sheeted bodies, then progressively deformed and partly mylonitized. The zone is characterized by a vertical to subvertical foliation and a subhorizontal stretching lineation. Kinematic criteria indicate a dextral sense of shear. A solid-state tectonic fabric is preserved in the mylonitic and magmatic rocks. The submagmatic and weak solid-state fabrics in these granitic plutons all are concordant, and they record horizontal shortening subvertical extension, and a significant component of dextral simple shear. The plutons are interpreted in terms of syntranspressional magmatism. The SIMS U-Pb ages of zircons in the granite plutons are 57-46 Ma, and the ages of the mylonitic granites range from 34 to 22 Ma We interpret the timing of the transpressive deformation to be between 57 and 22 Ma, and it may have started in the Late Paleocene and/or Early Eocene, corresponding to a period of crustal thickening due to India-Asia convergence. Movements dominated by dextral ductile shear occurred during the Early Oligocene to Early Miocene, accompanied by the continuous intrusion of granites. The total displacement along the zone is greater than 100 km. Ar-40/Ar-39 analysis of both the mylonites and the undeformed granites provides additional limits on the timing of vertical exhumation deformation, which is most consistent with a Middle Miocene cooling event along the transpressional zone (19-16 Ma). The Biluoxueshan shear zone, therefore, displays a complex geological history of deformation since ca. 57 Ma, and it has played a significant role in the overall intracontinental deformation, rather than merely being a strike-slip fault for the southeastwards differential extrusion of the Indochina block. (C) 2012 Elsevier B.V. All rights reserved.
关键词	RIVER SHEAR ZONE TECTONIC EVOLUTION STRIKE-SLIP PREFERRED ORIENTATIONS CONTINENTAL EXTRUSION TERTIARY DEFORMATION WESTERN YUNNAN TRACE-ELEMENT SIERRA-NEVADA INDO-CHINA
英文关键词	Biluoxueshan transpressive zone; Kinematics; Pluton; Zircon U-Pb; Ar-40/Ar-39; Early Eocene
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000311323900008
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258016
推荐引用方式 GB/T 7714	Zhang, Bo,Zhang, Jinjiang,Chang, Zufeng,et al. The Biluoxueshan transpressive deformation zone monitored by synkinematic plutons, around the Eastern Himalayan Syntaxis[J]. 中国科学院青藏高原研究所,2012,574.
APA	Zhang, Bo,Zhang, Jinjiang,Chang, Zufeng,Wang, Xiaoxian,Cai, Fulong,&Lai, Qingzhou.(2012).The Biluoxueshan transpressive deformation zone monitored by synkinematic plutons, around the Eastern Himalayan Syntaxis.TECTONOPHYSICS,574.
MLA	Zhang, Bo,et al."The Biluoxueshan transpressive deformation zone monitored by synkinematic plutons, around the Eastern Himalayan Syntaxis".TECTONOPHYSICS 574(2012).