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Asthana, Rajesh
- The Grain-Size Behaviour and Morphoscopy of Supraglacial Sediments, South of Schirmacher Oasis, E. Antarctica
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Authors
Affiliations
1 Antarctica Division, Geological Survey of India, Faridabad-121001, IN
1 Antarctica Division, Geological Survey of India, Faridabad-121001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 5 (1998), Pagination: 557-568Abstract
The present study embodies the description of textural characteristics and quartz grain morphology (under SEM) of sediments occurring in three micro-environments on the polar ice sheet. Coarse to fine grained, largely ill-sorted sediments with a polymodal distribution reflect a varying magnitude in the velocity of the transporting medium. A dominant saltation population with little suspension and lack of rolling population is revealed by cumulative curves which suggests transportation of these supraglacial sediments by wind. The quartz grains bear two generations of mechanical textures and a third phase of chemical textures attributed to glacial and aeolian environments.Keywords
Sedimentology, Supraglacial Sediments, Grain Size Analysis, Schinnacher Oasis, Antarctica.
- The Ice Sheet Dynamics around Dakshin Gangotri Glacier, Schirmacher Oasis, East Antarctica vis-a-vis Topography and Meteorological Parameters
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Authors
Affiliations
1 Antarctica Division, Geological Survey of India, Faridabad - 121 001, IN
1 Antarctica Division, Geological Survey of India, Faridabad - 121 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 2 (2011), Pagination: 117-123Abstract
Recession of the snout of Dakshin Gangotri glacier in the western part of Schirmacher Oasis, East Antarctica has been recorded over two decades. However, the rate of retreat is not uniform and varies at different locations. The ice wall forming the western flank of the glacier has shown an average retreat of 17.07 m between 2001 and 2009 while the snout had gone back by 6.94 m (average) during the same period. Before 2001, the snout had shown a complete recession of 3.13 m (average). The snout occupies valley area receiving less amount of solar radiation as compared to the western wall, which is a vertical cliff receiving maximum amount of solar radiation. The notable difference in the rate of recession in different parts of the Dakshin Gangotri glacier overriding Schirmacher Oasis can be attributed to combined effect of natural factors, including meteorological parameters, ice sheet dynamics and geomorphology of that area.Keywords
Snout, Recession, Ice Dynamics, DG Glacier, Schirmacher Oasis, East Antarctica.References
- ASTHANA, R., GAUR, M.P. and CHATURVEDI, A. (1996) Notes on Pattern of Snow accumulation / ablation on ice shelf and secular movement of Dakshin Gangotri glacier snout in Central Dronning Maud Land, East Antarctica. Scientific report on the twelfth Indian Scientific Expedition to Antarctica, Tech. Pub. No. 10, D.O.D., Govt. of India. New Delhi, pp111-122
- CHATURVEDI, A., BEG, M.J., SINGH, A. and RAVINDRA, R. (2003) Two decades of obervations over polar ice cap margin in Schirmacher range of central Dronning Maud Land Antarctica, Abstract for 7th Int. Symposium of Antarctic Glaciology (ISAG-7) Milano, Italy.
- CHATURVEDI, A., BEG, M.J. and KESHAV PRASAD, A.V. (2004) Monthly patterns of Advance and Retreat of Dakshin Gangotri glacier snout in Schirmacher range, Ninteenth Indian Expedition to Antarctica, Scientific Report, DOD, Tech. Publ. No. 17, pp 21-31.
- CHATURVEDI, A., SINGH, A., GAUR, M.P., KRISHNAMURTHY, K.V. and BEG, M.J. (1999) A confirmation of Polar Glacial Recession by monitoring the Snout of Dakshin Gangotri Glacier in Schirmacher range. Scientific report on fifteenth Indian Expedition to Antarctica, Tech. Pub No. 13, D.O.D. Govt. of India, New Delhi, pp 321-336.
- GUPTA, S.C. and KAPOOR, V.K. (2002) Fundamentals of Mathematical Statistics, Correlation Regression, Sultan Chad and sons New Delhi, pp10.1-10.10.
- SUNIL, P.S., REDDY, C.D., PONRAJ, M., DHAR, A. and JAYAPAUL, D. (2007) GPS determination of the velocity and strain rate fields on Schirmacher Glacier, central Dronning Maud Land, Antarctica. Jour. Glaciology, v.53, No.183, pp.558-564.
- Ionic Characters of Lake Water of Bharti Promontory, Larsemann Hills, East Antarctica
Abstract Views :224 |
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Authors
Affiliations
1 Geological Survey of India, Faridabad - 121 001, IN
2 National Centre for Antarctic and Ocean Research, Vasco-Da-Gama, Goa - 403 804, IN
1 Geological Survey of India, Faridabad - 121 001, IN
2 National Centre for Antarctic and Ocean Research, Vasco-Da-Gama, Goa - 403 804, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 3 (2011), Pagination: 217-225Abstract
The Larsemann Hills area represents a unique environmental setting between marine and glacial ecosystems. One of the promontories of this region, named Bharti, depicting similar set up was selected for the study of chemical parameters with special reference to its ionic characters. Water samples from 6 selected lakes of Bharti promontory, Larsemann Hills area were collected during the austral summer of 2004-05 and analysed for major ionic concentration and Total Dissolved Solid (TDS). This study is aimed at understanding the water chemistry of lakes of this island with emphasis on correlation between different ionic concentrations, TDS and its possible causes. The study will provide baseline data that will be useful for planning further studies. Analytical result shows that the water chemistry of these lakes is mainly governed by the lithology, precipitation, drainage and marine environment. Minor contribution of evaporation, has also been observed on the chemistry of one of the lake water. The main source of water for these lakes comes mainly from snow precipitation and its melting. The drainage line mostly goes towards eastern direction for these lakes.Keywords
Ionic Characters, Water Chemistry, Precipitation, Larsemann Hills, Bharti Promontory.References
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