Knowledge Resource Center for Ecological Environment in Arid Area
| 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, Poonam1,2; Kumar, Anil2; Sharma, Choudhurimayum Pankaj2; Singhal, Saurabh2; Sundriyal, Y. P.1; Srivastava, Pradeep2 | |
| Corresponding Author | Srivastava, Pradeep |
| Journal | GLOBAL AND PLANETARY CHANGE
 |
| ISSN | 0921-8181 |
| EISSN | 1872-6364 |
| Year Published | 2019 |
| Volume | 178Pages:110-128 |
| Abstract in English | 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. |
| Keyword in English | Ladakh Himalaya Zanskar River Aggradation-Incision Luminescence Chronology U-Pb Zircon chronology |
| Subtype | Article |
| Language | 英语 |
| Country | India |
| Indexed By | SCI-E |
| WOS ID | WOS:000471734600008 |
| WOS Keyword | U-PB ZIRCON ; TIBETAN PLATEAU ; LADAKH HIMALAYA ; ACTIVE TECTONICS ; WESTERN HIMALAYA ; NORTHERN INDIA ; SEDIMENT FLUX ; INDUS RIVER ; SHEAR ZONE ; EVOLUTION |
| WOS Subject | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS Research Area | Physical Geography ; Geology |
| Document Type | 期刊论文 |
| Identifier | http://119.78.100.177/qdio/handle/2XILL650/216072 |
| Affiliation | 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 |
| Recommended Citation 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. |
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