Geomorphic investigation of the Late-Quaternary landforms in the southern Zanskar Valley, NW Himalaya
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The Suru, Doda and Zanskar river valleys in the semi-arid region of Southern Zanskar Ranges (SZR) preserve a rich repository of the glacial and fluvial landforms, alluvial fans, and lacustrine deposits. Based on detailed field observations, geomorphic mapping and limited optical ages, we suggest four glaciations of decreasing magnitude in the SZR. The oldest Southern Zanskar Glaciation Stage (SZS-4) is inferred from glacially polished bedrock and tillite pinnacles. The SZS-4 is ascribed to the Marine Isotopic Stage (MIS)-4/3. The subsequent SZS-3 is represented by obliterated and dissected moraines, and is assigned to MIS-2/Last Glacial Maximum. The multiple recessional moraines of SZS-2 glaciation are assigned the early to mid Holocene age whereas, the youngest SZS-1 moraines were deposited during the Little Ice Age. We suggest that during the SZS-2 glaciation, the Drang-Drung glacier shifted its course from Suru Valley (west) to the Doda Valley (east). The study area has preserved three generations of outwash gravel terraces, which broadly correlate with the phases of deglaciation associated with SZS-3, 2, and 1. The alluvial fan aggradation, lacustrine sedimentation, and loess deposition occurred during the mid-to-late Holocene. We suggest that glaciation was driven by a combination of the mid-latitude westerlies and the Indian Summer Monsoon during periods of cooler temperature, while phases of deglaciation occurred during enhanced temperature.
KeywordsZanskar Himalaya Late Quaternary glaciation Indian summer monsoon Westerlies
This work is an outcome of the DST-sponsored field training programme coordinated by KSKV Kutchch University in 2015. Dr Navin Juyal is acknowledged for his guidance in the field work. Dr Anil Shukla, PRL, Ahmedabad, is acknowledged for radioactivity data. SS especially thanks Prof. M G Thakkar, Kutchch University and Dr S K Parcha, WIHG for their care and support during the field injury. We are also thankful to the three anonymous reviewers for their critical comments and suggestions which helped in improving the manuscript greatly.
- Bhutiyani M R, Kale V S and Pawar N J 2010 Climate change and the precipitation variations in the northwestern Himalaya: 1866–2006; Int. J. Climatol. 30(4) 535–548.Google Scholar
- Blair T C and McPherson J G 1994 Alluvial fan processes and forms; In: Geomorphology of desert environments, Springer Netherlands, pp. 354–402.Google Scholar
- Brodzikowski K and Van Loon A J 1991 Review of glaciogenic sediments; Dev. Sedimentol. 49 688.Google Scholar
- Dèzes P 1999 Tectonic and metamorphic evolution of the central Himalayan domain in southeast Zanskar (Kashmir, India) 145, Université de Lausanne.Google Scholar
- Eugster P, Scherler D, Thiede R C, Codilean A T and Strecker M R 2016 Rapid last glacial maximum deglaciation in the Indian Himalaya coeval with midlatitude glaciers: New insights from 10Be-dating of ice-polished bedrock surfaces in the Chandra Valley, NW Himalaya; Geo. Res. Lett., https://doi.org/10.1002/2015GL066077.
- Hughton J T, Ding Y, Griggs D J, Noguer, M, van der Linden P J, Dai X, Maskell K and Johnson C A (eds) 2001 Climate change 2001: The scientific basis, Cambridge University Press, Cambridge, U.K.Google Scholar
- Lowe J J and Walker M J 2014 Reconstructing quaternary environments; 3rd edn, Routledge, Taylor & Francis Group, London & New York.Google Scholar
- Miall A 2013 The geology of fluvial deposits: Sedimentary facies, basin analysis, and petroleum geology; Springer.Google Scholar
- Nagar Y C, Ganju A, Satyawali P K and Juyal N 2013 Preliminary optical chronology suggests significant advance in Nubra valley glaciers during the Last Glacial Maximum; Curr. Sci. 105(1) 96–101.Google Scholar
- Osmaston A H 2001 The geology, geomorphology and Quaternary history of Zangskar; In: Himalayan Buddhist Villages environment, resources, society and religion life in Zagskar, Ladakh (eds) Osmaston A H and Crook H J, University of Bristol.Google Scholar
- Saha S, Sharma M C, Murari M K, Owen L A and Caffee M W 2015 Geomorphology, sedimentology and minimum exposure ages of streamlined subglacial landforms in the NW Himalaya, India; Boreas 5(2) 284–303.Google Scholar
- Searle M 2013 Colliding continents: A geological exploration of the Himalaya, Karakoram, and Tibet; Oxford University Press.Google Scholar
- Singh D S 2014 Surface processes during flash floods in the glaciated terrain of Kedarnath, Garhwal Himalaya and their role in the modification of landforms; Curr. Sci. 106(4) 59.Google Scholar
- Singh D S and Mishra A 2002 Role of tributary glaciers on landscape modification in the Gangotri Glacier area, Garhwal Himalaya, India; Curr. Sci. 82(5) 567–570.Google Scholar
- Singh D S, Tangri A K, Kumar D, Dubey C A and Bali R 2016 Pattern of retreat and related morphological zones of Gangotri Glacier, Garhwal Himalaya, India; Quat. Int., https://doi.org/10.1016/j.quaint.2016.07.025.
- Street-Perrott F A and Roberts N 1983 Fluctuations in closed-basin lakes as an indicator of past atmospheric circulation patterns; In: Variations in the Global Water Budget (eds) Street-Perrott F A, Beran M A and Ratcliffe R A S, Reidel, Dordrecht pp. 365–383.Google Scholar
- Walker M J C, Berkelhammer M, Björck S, Cwynar L C, Fisher D A, Long A J, Lowe J J, Newnham R M, Rasmussen S O and Eiss H 2012 Formal subdivision of the Holocene Series/Epoch: A Discussion Paper by a Working Group of INTIMATE (Integration of ice-core, marine and terrestrial records) and the Subcommission on Quaternary Stratigraphy (International Commission on Stratigraphy); J. Quat. Sci., https://doi.org/10.1002/jqs.2565.