气候变化领域集成服务门户(CCPortal): Coupled U-Pb dating and Hf isotopic analysis of detrital zircon of modern river sand from the Yalu River (Yarlung Tsangpo) drainage system in southern Tibet: Constraints on the transport processes and evolution of Himalayan rivers

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DOI	10.1130/B30592.1
	Coupled U-Pb dating and Hf isotopic analysis of detrital zircon of modern river sand from the Yalu River (Yarlung Tsangpo) drainage system in southern Tibet: Constraints on the transport processes and evolution of Himalayan rivers
	Zhang, J. Y.; Yin, A.; Liu, W. C.; Wu, F. Y.; Lin, Ding; Grove, M.
通讯作者	Zhang, JY (通讯作者)
发表日期	2012
ISSN	0016-7606
EISSN	1943-2674
起始页码	1449
结束页码	1473
卷号	124 期号:9-10
英文摘要	We conducted coupled U-Pb dating and Hf isotope analysis of detrital zircon in modern sand of the Yalu River in southern Tibet. Our work indicates that the presence or absence of distinctive zircon populations in the Yalu main stream depends critically on the geometric configuration of the tributary rivers. The proportion of upper-stream zircon populations in the Yalu River sand decreases systematically in the downstream direction, which is caused mainly by zircon addition from new source areas in the downstream region. In some extreme cases, the upstream zircon signals can completely be lost in the downstream region due to this dilution effect. Analysis of sand modal composition reveals a downstream increase in the proportion of lithic fragments along the Yalu River, from similar to 40% to similar to 60% over a distance of similar to 600 km. This may be attributed to the combined effect of an eastward increase in the topographic relief and an eastward increase in annual precipitation across the Yalu River drainage basin. Quantitative comparison of detrital-zircon ages between the Yalu River sand and Neogene sediments of the eastern Himalayan foreland supports a previous proposal that the Yalu River once flowed directly over the eastern Himalaya, without going around the Himalaya through its eastern syntaxis. The shortcut appears to have been transient, as it is only recorded in specific stratigraphic horizons of foreland sediments. The inferred Yalu River diversion may have been caused by past advances of glaciers or emplacements of giant landslides that temporarily dammed the Yalu River.
关键词	TETHYAN HIMALAYA STRUCTURAL EVOLUTION LANDSCAPE EVOLUTION GANGDESE BATHOLITH CRETACEOUS STRATA CLASTIC SEDIMENT VOLCANIC-ROCKS MANTLE SOURCE QAIDAM BASIN LHASA BLOCK
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000307915700004
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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/258078
推荐引用方式 GB/T 7714	Zhang, J. Y.,Yin, A.,Liu, W. C.,et al. Coupled U-Pb dating and Hf isotopic analysis of detrital zircon of modern river sand from the Yalu River (Yarlung Tsangpo) drainage system in southern Tibet: Constraints on the transport processes and evolution of Himalayan rivers[J]. 中国科学院青藏高原研究所,2012,124(9-10).
APA	Zhang, J. Y.,Yin, A.,Liu, W. C.,Wu, F. Y.,Lin, Ding,&Grove, M..(2012).Coupled U-Pb dating and Hf isotopic analysis of detrital zircon of modern river sand from the Yalu River (Yarlung Tsangpo) drainage system in southern Tibet: Constraints on the transport processes and evolution of Himalayan rivers.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,124(9-10).
MLA	Zhang, J. Y.,et al."Coupled U-Pb dating and Hf isotopic analysis of detrital zircon of modern river sand from the Yalu River (Yarlung Tsangpo) drainage system in southern Tibet: Constraints on the transport processes and evolution of Himalayan rivers".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 124.9-10(2012).