气候变化领域集成服务门户(CCPortal): Tectonostratigraphy and provenance of an accretionary complex within the Yarlung-Zangpo suture zone, southern Tibet: Insights into subduction-accretion processes in the Neo-Tethys

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DOI	10.1016/j.tecto.2012.08.016
	Tectonostratigraphy and provenance of an accretionary complex within the Yarlung-Zangpo suture zone, southern Tibet: Insights into subduction-accretion processes in the Neo-Tethys
	Cai, Fulong; Ding, Lin; Leary, Ryan J.; Wang, Houqi; Xu, Qiang; Zhang, Liyun; Yue, Yahui
通讯作者	Cai, FL (通讯作者)
发表日期	2012
ISSN	0040-1951
EISSN	1879-3266
起始页码	181
结束页码	192
卷号	574
英文摘要	Accretionary complexes record critical information about the history of subduction and accretion along the southern margin of Asia prior to the India-Asia collision. This paper presents detailed field mapping, petrographic and detrital zircon U-Pb data from an accretionary complex within the Yalung-Zangpo suture zone, southern Tibet. From structurally higher to lower levels, the accretionary complex consists of a serpentinite melange, the chert-matrix Tangga melange, the mud-matrix Pomunong melange, and the coherent Rongmawa Formation. The Tangga melange consists of Late Triassic-Early Cretaceous abyssal chert and siliceous shale with blocks of chert and mafic to ultra-mafic rocks. The Tangga melange was accreted beneath ophiolitic rocks during the Aptian. The Pomunong melange consists of a Late Jurassic-Early Cretaceous hemipelagic siliceous shale and chert matrix with blocks from Early Permian seamounts and from Late Cretaceous trench-fill sandstones; it was accreted beneath the Tangga melange after the Aptian but prior to 71 Ma. Structurally beneath these melanges to the south, the uppermost Cretaceous Rongmawa Formation consists of turbiditic sandstone, pelagic chert, and siliceous shale and records a transition in depositional setting from lower abyssal plain to upper trench. Detrital zircons from sandstone blocks of the Pomunong melange and the coherent Rongmawa Formation display similar U-Pb age spectra and are dominated by peaks at 71-231 Ma, 481-693 Ma, and 701-1372 Ma. These age peaks overlap with igneous crystallization ages and detrital zircon ages from sedimentary strata in the Lhasa terrane. Our data indicate that the serpentinite melange, Tangga melange, Pomunong melange and Rongmawa Formation comprise a southward-younging accretionary complex that developed during the northward subduction of Neo-Tethyan oceanic lithosphere beneath the south margin of the Lhasa terrane and that all exposed ophiolitic and accretionary complex assemblages were accreted to the Asian margin prior to the India-Asia continental collision. (C) 2012 Elsevier B.V. All rights reserved.
关键词	ZIRCON U-PB FORE-ARC BASIN CENOZOIC TECTONIC EVOLUTION TSANGPO SUTURE LHASA TERRANE NEOTETHYAN SUBDUCTION GANGDESE BATHOLITH CRETACEOUS STRATA XIGAZE OPHIOLITE GEOCHRONOLOGY
英文关键词	Yarlung-Zangpo suture zone; Subduction; Accretion; Provenance; Tectonic evolution
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000311323900009
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/257991
推荐引用方式 GB/T 7714	Cai, Fulong,Ding, Lin,Leary, Ryan J.,et al. Tectonostratigraphy and provenance of an accretionary complex within the Yarlung-Zangpo suture zone, southern Tibet: Insights into subduction-accretion processes in the Neo-Tethys[J]. 中国科学院青藏高原研究所,2012,574.
APA	Cai, Fulong.,Ding, Lin.,Leary, Ryan J..,Wang, Houqi.,Xu, Qiang.,...&Yue, Yahui.(2012).Tectonostratigraphy and provenance of an accretionary complex within the Yarlung-Zangpo suture zone, southern Tibet: Insights into subduction-accretion processes in the Neo-Tethys.TECTONOPHYSICS,574.
MLA	Cai, Fulong,et al."Tectonostratigraphy and provenance of an accretionary complex within the Yarlung-Zangpo suture zone, southern Tibet: Insights into subduction-accretion processes in the Neo-Tethys".TECTONOPHYSICS 574(2012).