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DOI	10.1002/2016TC004334
	Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet
	Laskowski, Andrew K.; Kapp, Paul; Ding, Lin; Campbell, Clay; Liu, XiaoHui
通讯作者	Laskowski, AK (通讯作者)
发表日期	2017
ISSN	0278-7407
EISSN	1944-9194
起始页码	108
结束页码	136
卷号	36 期号:1
英文摘要	The Lopu Range, located similar to 600km west of Lhasa, exposes a continental high-pressure metamorphic complex beneath India-Asia (Yarlung) suture zone assemblages. Geologic mapping, 14 detrital U-Pb zircon (n=1895 ages), 11 igneous U-Pb zircon, and nine zircon (U-Th)/He samples reveal the structure, age, provenance, and time-temperature histories of Lopu Range rocks. A hornblende-plagioclase-epidote paragneiss block in ophiolitic melange, deposited during Middle Jurassic time, records Late Jurassic or Early Cretaceous subduction initiation followed by Early Cretaceous fore-arc extension. A depositional contact between fore-arc strata (maximum depositional age 971Ma) and ophiolitic melange indicates that the ophiolites were in a suprasubduction zone position prior to Late Cretaceous time. Five Gangdese arc granitoids that intrude subduction-accretion melange yield U-Pb ages between 49 and 37Ma, recording Eocene southward trench migration after collision initiation. The south dipping Great Counter Thrust system cuts older suture zone structures, placing fore-arc strata on the Kailas Formation, and sedimentary-matrix melange on fore-arc strata during early Miocene time. The north-south, range-bounding Lopukangri and Rujiao faults comprise a horst that cuts the Great Counter Thrust system, recording the early Miocene (similar to 16Ma) transition from north-south contraction to orogen-parallel (E-W) extension. Five early Miocene (17-15Ma) U-Pb ages from leucogranite dikes and plutons record crustal melting during extension onset. Seven zircon (U-Th)/He ages from the horst block record 12-6Ma tectonic exhumation. JurassicEocene Yarlung suture zone tectonics, characterized by alternating episodes of contraction and extension, can be explained by cycles of slab rollback, breakoff, and shallow underthrustingsuggesting that subduction dynamics controlled deformation.
关键词	XIGAZE FORE-ARC INDIA-ASIA COLLISION U-PB ZIRCON EAST-WEST EXTENSION SOUTHWESTERN TIBET TETHYAN HIMALAYA HIGH-PRESSURE FACIES ARCHITECTURE SEDIMENTARY HISTORY METAMORPHIC SOLE
英文关键词	Tibet; India-Asia collision; suture; continental subduction; high-pressure metamorphism; Himalaya
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000395098100005
来源期刊	TECTONICS
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/258917
推荐引用方式 GB/T 7714	Laskowski, Andrew K.,Kapp, Paul,Ding, Lin,et al. Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet[J]. 中国科学院青藏高原研究所,2017,36(1).
APA	Laskowski, Andrew K.,Kapp, Paul,Ding, Lin,Campbell, Clay,&Liu, XiaoHui.(2017).Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet.TECTONICS,36(1).
MLA	Laskowski, Andrew K.,et al."Tectonic evolution of the Yarlung suture zone, Lopu Range region, southern Tibet".TECTONICS 36.1(2017).