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DOI	10.1016/j.gloplacha.2019.04.015
	Late Pleistocene history of aggradation and incision, provenance and channel connectivity of the Zanskar River, NW Himalaya
	Chahal, Poonam 1,2; Kumar, Anil 2; Sharma, Choudhurimayum Pankaj 2; Singhal, Saurabh 2; Sundriyal, Y. P.1; Srivastava, Pradeep 2
通讯作者	Srivastava, Pradeep
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2019
卷号	178 页码:110-128
英文摘要	The Zanskar River, one of the largest tributaries of the upper Indus catchment, drains transversely northward from the Higher Himalaya, dominated by the Indian summer monsoon, to flow through the arid, westerliesdominated, highly folded and thrusted Zanskar ranges in Ladakh. The Doda and the Tsarap Lingti Chu join to form the Zanskar, which in turn joins the Indus at Nimu. With an average gradient of similar to 4 m/km, the Zanskar has a gradient similar to 2.5 times lower than that of rivers like the Ganga and Brahmaputra, which flow through the southern wet Himalaya. Based on Stream Length (SL) gradient index and valley width and height ratio, the Zanskar valley can be divided into upper and lower divisions, separated by a gorge of nearly 60 km length. The river channel in both the divisions is flanked by 10-30 m thick valley-fill deposits that in the upper part are amalgamated with fan and paleolake deposits. Using these fills and incorporating morpho-stratigraphy, Optically Stimulated Luminescence (OSL) dating and provenance analysis based on U-Pb Zircon chronology, the study show that the Zanskar valley aggraded in three phases: (i) the oldest phase during similar to 43 to similar to 32 ka (cool and wet MIS 3), (ii) during 20-12 ka, a climatic transition from the dry LGM to the wet early Holocene and (iii) the youngest aggradation phase commenced between 9 and 6 ka, corresponding with the strengthened monsoon phase of the early-mid Holocene. The study implies that, during the oldest aggradation phase, the wider Padam basin stored 3.25 +/- 0.11 km(3) of sediment, which, in the present geomorphic setup is 0.96 +/- 0.10 km(3). The provenance analysis suggests that, despite the presence of the deep narrow gorge and a low gradient, the upper and lower Zanskar valleys remained connected throughout their aggradational history. Unlike in the southern wetter Himalaya, where catchment-wide exhumation is the main source of sedimentation, valley filling in the Zanskar basin has been overwhelmed by sediment derived from headward erosion.
英文关键词	Ladakh Himalaya Zanskar River Aggradation-Incision Luminescence Chronology U-Pb Zircon chronology
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000471734600008
WOS关键词	U-PB ZIRCON ; TIBETAN PLATEAU ; LADAKH HIMALAYA ; ACTIVE TECTONICS ; WESTERN HIMALAYA ; NORTHERN INDIA ; SEDIMENT FLUX ; INDUS RIVER ; SHEAR ZONE ; EVOLUTION
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216072
作者单位	1.HNB Garhwal Univ, Dept Geol, Srinagar 249161, Jammu & Kashmir, India; 2.Wadia Inst Himalayan Geol, 33 GMS Rd, Dehra Dun 248001, Uttar Pradesh, India
推荐引用方式 GB/T 7714	Chahal, Poonam,Kumar, Anil,Sharma, Choudhurimayum Pankaj,et al. Late Pleistocene history of aggradation and incision, provenance and channel connectivity of the Zanskar River, NW Himalaya[J],2019,178:110-128.
APA	Chahal, Poonam,Kumar, Anil,Sharma, Choudhurimayum Pankaj,Singhal, Saurabh,Sundriyal, Y. P.,&Srivastava, Pradeep.(2019).Late Pleistocene history of aggradation and incision, provenance and channel connectivity of the Zanskar River, NW Himalaya.GLOBAL AND PLANETARY CHANGE,178,110-128.
MLA	Chahal, Poonam,et al."Late Pleistocene history of aggradation and incision, provenance and channel connectivity of the Zanskar River, NW Himalaya".GLOBAL AND PLANETARY CHANGE 178(2019):110-128.