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Geosciences 2017, 7(3), 64; doi:10.3390/geosciences7030064

Late Holocene Glacier Dynamics in the Miyar Basin, Lahaul Himalaya, India

1
Department of Geography, Govt. College Dujana, Haryana 124102, India
2
Centre for the Study of Regional Development, Jawaharlal Nehru University, New Delhi 110067, India
3
Department of Geography, Dr. Hari Singh Gour Central University, Sagar 470003, India
4
Physical Research Laboratory, Ahmedabad 380015, India
5
Wadia Institute of Himalayan Geology, Dehradun 248001, India
6
Space Application Centre, Ahmedabad 380015, India
*
Author to whom correspondence should be addressed.
Academic Editors: Ulrich Kamp and Jesús Martínez Frías
Received: 5 May 2017 / Revised: 23 July 2017 / Accepted: 25 July 2017 / Published: 4 August 2017
(This article belongs to the Special Issue Cryosphere)
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Abstract

Detailed field mapping of glacial and paraglacial landforms and optical dating from these landforms are used to reconstruct the early Holocene glaciation in the semi-arid region of Miyar basin, Lahaul Himalaya. The study identifies three stages of glaciation, of decreasing magnitude and termed, from oldest to youngest, the Miyar stage (MR-I), Khanjar stage (KH-II), and Menthosa advance (M-III). The oldest glacial stage (MR-I) has been established on the basis of detailed geomorphological evidence such as U-shaped valley morphology, trimlines, and truncated spurs. It is speculated to be older than the global Last Glacial Maximum (gLGM) based on the magnitude of ΔELA (Equilibrium-Line Altitude, 606m). No evidence of glacier expansion recorded from the basin correlates with the period of the gLGM. The second stage (KH-II) is well represented by extensive depositional features such as lateral and terminal moraines, drumlins, and lacustrine fills that have been constrained within 10 ± 1 to 6.6 ± 1.0 ka (Optically stimulated luminescence—OSL—ages), dating it to the early Holocene advance following the Younger Dryas cooling event. Exceptionally young glacial records of expansion are limited within a few hundred meters of the present termini of tributary glaciers and correlates with the 18th-century cooling event. Records of this glacial advance, termed the Menthosa advance, are clearly noticed in some tributary valleys. View Full-Text
Keywords: Holocene; glaciation; Lahaul Himalaya; LGM; ELA; OSL Holocene; glaciation; Lahaul Himalaya; LGM; ELA; OSL
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Deswal, S.; Sharma, M.C.; Saini, R.; Chand, P.; Juyal, N.; Singh, I.; Srivastava, P.; Ajai; Bahuguna, I. Late Holocene Glacier Dynamics in the Miyar Basin, Lahaul Himalaya, India. Geosciences 2017, 7, 64.

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