气候变化领域集成服务门户(CCPortal): The evolution of Yarlung Tsangpo River: Constraints from the age and provenance of the Gangdese Conglomerates, southern Tibet

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DOI	10.1016/j.gr.2015.05.010
	The evolution of Yarlung Tsangpo River: Constraints from the age and provenance of the Gangdese Conglomerates, southern Tibet
	Li, Shun; Ding, Lin; Xu, Qiang; Wang, Houqi; Yue, Yahui; Baral, Upendra
通讯作者	Li, S (通讯作者)
发表日期	2017
ISSN	1342-937X
EISSN	1878-0571
起始页码	249
结束页码	266
卷号	41
英文摘要	Cenozoic conglomerates are exposed discontinuously along the length of the Yarlung Tsangpo suture zone on the southernmargin of the Gangdese arc. These conglomerates (the Gangdese Conglomerates herein) record a crucial stage in the uplift and erosion histories of the southern Tibet after the initial India-Asia collision. In the Mt. Kailas area, the Gangdese Conglomerates strata consist of multiple sedimentary cycles and each cycle is a fining-upward sequence that was deposited by alluvial fan, braided-river and delta systems. Whereas in the Xigaze area, the Gangdese Conglomerates strata comprise a coarsening-upward sequence that was deposited by delta, braided-river and alluvial fan systems. Based on the detrital and igneous zircon U-Pb ages, the depositional ages of the Gangdese Conglomerates are late Oligocene to early Pliocene (ca. 26-5 Ma) in the Mt. Kailas area, late Oligocene to middle Miocene (ca. 26-15 Ma) in the Xigaze area, and late Oligocene to early Miocene (ca. 26-19 Ma) in the Zedong area. Paleocurrent measurements and provenance data (i.e., conglomerate clast composition, sandstone petrology and detrital zircon age) indicate that the initial detritus of the Gangdese Conglomerates were entirely derived from the north (mainly from the Gangdese arc). Sediment resulting from denudation to the south (the Xigaze forearc basin, the Yarlung Tsangpo suture zone and the northern margin of the Indian plate) first appeared by the early Miocene (ca. 19 Ma) and subsequently increased in abundance gradually. Our new results, together with previous data from the Xigaze area, reveal 3 major stages in the evolution of the Yarlung Tsangpo River system: (1) the southward-flowing stage (ca. 26-19 Ma) featured southward-draining transverse rivers that transported materials from the Gangdese arc southward. Southward paleocurrents in the Gangdese Conglomerates indicate a northern source. (2) The westward-flowing stage (ca. 19-15 Ma) developed due to the uplift of the suture zone and Tethys Himalaya to the south. Northward-draining rivers began to develop, and lakes resembling a string of beads formed and finally connected together, initiating the westward flowing paleo-Yarlung Tsangpo River. Westward paleoflows were recorded in the Gangdese Conglomerates. (3) The eastward-flowing stage (ca. 15 Ma-present) resulted from differential uplift and denudation of the southern Tibet, which reversed the direction of the young Yarlung Tsangpo River by ca. 15 Ma. The deposition of the Gangdese Conglomerates was controlled by eastward paleoflows. At this point, the modern eastward-flowing Yarlung Tsangpo River system was established. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词	INDIA-ASIA COLLISION FORE-ARC BASIN ZIRCON U-PB SUTURE ZONE DETRITAL ZIRCON CONTINENTAL COLLISION KARAKORAM FAULT STRUCTURAL EVOLUTION TECTONIC EVOLUTION SOUTHWESTERN TIBET
英文关键词	Gangrinboche conglomerates; U-Pb age; Provenance analysis; Yarlung Tsangpo River; Tibet
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000397873300017
来源期刊	GONDWANA RESEARCH
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/258895
推荐引用方式 GB/T 7714	Li, Shun,Ding, Lin,Xu, Qiang,et al. The evolution of Yarlung Tsangpo River: Constraints from the age and provenance of the Gangdese Conglomerates, southern Tibet[J]. 中国科学院青藏高原研究所,2017,41.
APA	Li, Shun,Ding, Lin,Xu, Qiang,Wang, Houqi,Yue, Yahui,&Baral, Upendra.(2017).The evolution of Yarlung Tsangpo River: Constraints from the age and provenance of the Gangdese Conglomerates, southern Tibet.GONDWANA RESEARCH,41.
MLA	Li, Shun,et al."The evolution of Yarlung Tsangpo River: Constraints from the age and provenance of the Gangdese Conglomerates, southern Tibet".GONDWANA RESEARCH 41(2017).