Reconstruction of Last Glacial to early Holocene monsoon variability from relict lake sediments of the Higher Central Himalaya,Uttrakhand, India |
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| Authors: | N Juyal RK Pant N Basavaiah R Bhushan M Jain NK Saini MG Yadava AK Singhvi |
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| Institution: | 1. Physical Research Laboratory, Navrangpura, Ahmedabad-38 009, India;2. Wadia Institute of Himalayan Geology, 33 General Mahadev Singh Road, Dehra Dun-248 001, India;3. Indian Institute of Geomagnetism, Kalamboli Highway, Navi Mumbai-410 218, India;4. Radiation Research Department, Risø National Laboratory, Technical University of Denmark, DK 4000, Roskilde, Denmark;1. Department of Geology, Lucknow University, Lucknow, UP, India;2. Physical Research Laboratory, Navrangpura, Ahmedabad, Gujarat, India;3. Wadia Institute of Himalayan Geology, Dehradun, UK;1. Institute of Seismological Research, Raisan, Gandhinagar, Gujarat, India;2. Physical Research Laboratory, Ahmedabad, Gujarat, India;1. Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226007, India;2. Central University of Himachal Pradesh, Dharamshala 176 215, India;3. Department of AIH and Archaeology, Lucknow University, Lucknow 226007, India;1. Department of Geology, H.N.B. Garhwal University, Srinagar, Garhwal 246174, India;2. Physical Research Laboratory, Navrangpura, Ahmedabad, Gujarat 380009, India;3. Institute of Seismological Research, Gandhinagar, Gujarat 382009, India;1. Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India;2. Centre of Advanced Study, Palaeobotany-Palynology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, India;3. Indian Institute of Tropical Meteorology, Pune;4. Department of Geology & Geophysics, Indian Institute of Technology, IIT Kharagpur, Kharagpur 721302, India;1. Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany;2. Department of Earth Sciences, Indian Institute of Science Education and Research, 741252 Kolkata, India;3. Institute for Earth- and Environmental Science, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany;4. Limnology and Fisheries Laboratory, Centre of Research for Development, University of Kashmir, India;5. Universität Hamburg, Institute of Biogeochemistry and Marine Chemistry, Hamburg, Germany;6. Indian Institute of Geomagnetism, Navi Mumbai, India |
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| Abstract: | Proglacial lake sediments at Goting in the Higher Central Himalaya were analyzed to reconstruct the summer monsoon variability during the Last Glacial to early Holocene. Sedimentary structures, high resolution mineral magnetic and geochemical data suggest that the lacustrine environment experienced fluctuating monsoonal conditions. Optically stimulated luminescence (OSL) dating indicates that the lake sedimentation occurred before 25 ka and continued after 13 ka. During this period, Goting basin witnessed moderate to strengthened monsoon conditions around 25 ka, 23.5 ka–22.5 ka, 22 ka–18 ka, 17 ka–16.5 ka and after14.5–13 ka. The Last Glacial phase ended with the deposition of outwash gravel dated at ～11 ka indicating glacial retreat and the onset of Holocene condition. Additionally, centennial scale fluctuations between 16.5 ka and 12.7 ka in the magnetic and geochemical data are seen.A close correspondence at the millennial scale between our data and that of continental and marine records from the Indian sub-continent suggests that Goting basin responded to periods of strengthened monsoon during the Last Glacial to early Holocene. We attribute the millennial scale monsoon variability to climatic instability in higher northern latitudes. However, centennial scale abrupt changes are attributed to the result of albedo changes on the Himalaya and Tibetan plateau. |
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