气候变化领域集成服务门户(CCPortal): Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet

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DOI	10.1016/j.tecto.2018.07.024
	Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet
	Wang, Hou-Qi; Ding, Lin; Kapp, Paul; Cai, Fu-Long; Clinkscales, Christopher; Xu, Qiang; Yue, Ya-Hui; Li, Shun; Fan, Shuai-Quan
通讯作者	Wang, HQ (通讯作者)
发表日期	2018
ISSN	0040-1951
EISSN	1879-3266
起始页码	373
结束页码	389
卷号	744
英文摘要	The accretionary complex of the Yarlung Zangbo Suture Zone (YZSZ) in southern Tibet records the subduction-accretion process of Neo-Tethys oceanic lithosphere. We report field observations, petrographic analysis, detrital zircon U-Pb geochronology, and Hf isotope data of one sedimentary-matrix melange unit of YZSZ in Sangsang area, central southern Tibet. This melange unit is the northernmost, and presumably the oldest one within the YZSZ accretionary complex. The sandstone matrix and blocks are rich in volcanic detritus, linking the main provenance to a juvenile magmatic arc. U-Pb-Hf analysis of detrital zircons from the sandstones reveals a unimodal age population of similar to 186-121 Ma with high positive epsilon Hf(t) values of +6.67 to +14.58, consistent with derivation from Gangdese Arc on southern margin of Lhasa terrane. The maximum depositional age of the melange unit is limited to be 149-134 Ma by averaging the youngest detrital zircon ages. The sandstones of this melange unit probably deposited in the trench basin within a few million years of early accretion driven by the Neo-Tethys oceanic subduction. The development of arc-trench system verified the initiation of subduction of Neo-Tethys oceanic lithosphere in Early Jurassic. Our results and integration of previous studies on subduction-accretion process of Neo-Tethys subduction indicate that the accretionary complex in Sangsang area documented at least two stages of accretion processes, stage 1 in earliest Cretaceous and stage 2 in Late Cretaceous, separated by a period of forearc extension forming the Yarlung Zangbo Ophiolites. These two stages of accretion correspond to growth and erosion of Gangdese Arc and crustal shortening in southern Eurasian margin.
关键词	XIGAZE FORE-ARC ZIRCON U-PB INDIA-ASIA COLLISION LHASA TERRANE IMPLICATIONS VOLCANIC-ROCKS NEOTETHYAN SUBDUCTION TSANGPO SUTURE FACIES ARCHITECTURE PLATE STRATIGRAPHY TECTONIC EVOLUTION
英文关键词	Yarlung Zangbo Suture Zone; Neo-Tethys subduction; Accretionary complex; Trench basin; Detrital zircon
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000445987000025
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/259156
推荐引用方式 GB/T 7714	Wang, Hou-Qi,Ding, Lin,Kapp, Paul,et al. Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet[J]. 中国科学院青藏高原研究所,2018,744.
APA	Wang, Hou-Qi.,Ding, Lin.,Kapp, Paul.,Cai, Fu-Long.,Clinkscales, Christopher.,...&Fan, Shuai-Quan.(2018).Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet.TECTONOPHYSICS,744.
MLA	Wang, Hou-Qi,et al."Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet".TECTONOPHYSICS 744(2018).