气候变化领域集成服务门户(CCPortal): Drainage evolution and exhumation history of the eastern Himalaya: Insights from the Nicobar Fan, northeastern Indian Ocean

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DOI	10.1016/j.epsl.2020.116472
	Drainage evolution and exhumation history of the eastern Himalaya: Insights from the Nicobar Fan, northeastern Indian Ocean
	Chen W.-H.; Yan Y.; Clift P.D.; Carter A.; Huang C.-Y.; Pickering K.T.; Chemale F.; Jr.; Shan Y.; Zhang X.
发表日期	2020
ISSN	0012821X
卷号	548
英文摘要	The eastern Himalayan syntaxis, where the Yarlung Tsangpo sharply bends, is one of the areas experiencing most rapid exhumation on Earth. The rapid exhumation is often regarded as the result of capture of the Yarlung Tsangpo by the Brahmaputra River. However, both the timing of integration of the Yarlung Tsangpo-Brahmaputra River and initiation of the rapid syntaxial exhumation are debated. As the ultimate sedimentary trap of the Yarlung Tsangpo-Brahmaputra River, the Nicobar Fan is a window to look into the drainage evolution and exhumation history of the eastern Himalaya. International Ocean Discovery Program Expedition 362 drilled the Nicobar Fan for the first time, recovering fan sediments dating back to the Early Miocene (∼19 Ma). We apply trace elements and Sr-Nd isotopes to investigate the provenance of the sediments in the Nicobar Fan with the aim of constraining the timing of integration of the Yarlung Tsangpo-Brahmaputra River and initiation of the rapid syntaxial exhumation. The geochemical and Sr-Nd isotope compositions indicate an eastern Himalayan source dominated by the Greater Himalaya, with significant Gangdese arc contribution and primarily carried by the Brahmaputra River. Flux of Gangdese arc material appears to have been continuous from the base of the Nicobar Fan, suggesting that the Yarlung Tsangpo-Brahmaputra River has been established at least since ∼19 Ma. Synchronously with the sharp rise in sedimentation rate, the abrupt change of geochemical and isotope compositions at ∼9.2 Ma indicates an increase in erosion of the Greater Himalaya as the result of initiation of rapid exhumation in the broad syntaxial region. The proportion of Greater Himalayan material increased again at 3.5–1.7 Ma, consistent with a younger pulse of rapid exhumation focused in the core of the syntaxis since ∼3.5 Ma. Our results show that initiation of the rapid syntaxial exhumation postdated integration of the Yarlung Tsangpo-Brahmaputra River by at least ∼10 m.y. Therefore, tectonic uplift rather than river capture could be responsible for the initiation of the rapid syntaxial exhumation. © 2020 Elsevier B.V.
关键词	eastern Himalayan syntaxis International Ocean Discovery Program Expedition 362 Nicobar Fan sedimentary record Yarlung Tsangpo-Brahmaputra River
英文关键词	Binary alloys; Geochemistry; Integration; Isotopes; Neodymium alloys; Strontium alloys; Trace elements; Brahmaputra River; Early Miocene; Himalayas; Indian ocean; Isotope compositions; Sedimentation rates; Sr-Nd isotopes; Tectonic uplift; Rivers; drainage network; exhumation; geochemistry; isotopic composition; Miocene; neodymium isotope; provenance; sedimentation rate; strontium isotope; tectonics; trace element; uplift; Brahmaputra River; Himalayas; Indian Ocean; Indian Ocean (Northeast)
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202539
作者单位	Key Laboratory of Ocean and Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510640, China; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet Street, London, WC1E 7HX, United Kingdom; School of Ocean and Earth Science, Tongji University, Shanghai, 200092, China; Department of Earth Sciences, University College London (UCL), London, WC1E 6BT, United Kingdom; Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, RS 93.022-750, Brazil
推荐引用方式 GB/T 7714	Chen W.-H.,Yan Y.,Clift P.D.,et al. Drainage evolution and exhumation history of the eastern Himalaya: Insights from the Nicobar Fan, northeastern Indian Ocean[J],2020,548.
APA	Chen W.-H..,Yan Y..,Clift P.D..,Carter A..,Huang C.-Y..,...&Zhang X..(2020).Drainage evolution and exhumation history of the eastern Himalaya: Insights from the Nicobar Fan, northeastern Indian Ocean.Earth and Planetary Science Letters,548.
MLA	Chen W.-H.,et al."Drainage evolution and exhumation history of the eastern Himalaya: Insights from the Nicobar Fan, northeastern Indian Ocean".Earth and Planetary Science Letters 548(2020).