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Lake Sediments from the Kashmir Himalayas: Inverted 14C Chronology and Its Implications

Published online by Cambridge University Press:  18 July 2016

Sheela Kusumgar ,
D. P. Agrawal ,
Narendra Bhandari ,
R. D. Deshpande ,
Alok Raina ,
Chhemendra Sharma  and
M. G. Yadava
Sheela Kusumgar
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
D. P. Agrawal
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
Narendra Bhandari
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
R. D. Deshpande
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
Alok Raina
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
Chhemendra Sharma
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
M. G. Yadava
Affiliation:
Physical Research laboratory, Ahmedabad 380 009 India
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Abstract

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We have measured 14C, 210Pb and 137Cs profiles in two representative cores from Manasbal Lake, Kashmir, India. The sedimentation rate derived from 210Pb and 137Cs in the upper part of the core is in the range of 3.4 to 5.5 mm yr−1. In contrast, 14C ages show an inversion at depths >20 cm. These results are attributed to the erosion of the ubiquitous 10–20-m-thick loess mantle, based on the similarity of 14C ages of the inversion layer in the sediments and the paleosols present in the catchment area. Frequency-dependent mineral magnetic susceptibility (χfd), carbon to nitrogen ratios and pigment concentrations in the profile show a significant amount of allochthonous component in the lake deposits and support the conclusion that the 14C dates do not reflect the chronology of the in-situ lake sedimentation but episodic deposition of the surrounding loess. Thus, 14C serves as a useful tracer to understand source components of the sediments.

Information

Type
II. Applied Isotope Geochemistry
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 561 - 565
Copyright
Copyright © The American Journal of Science 

References

Agrawal, D. P., Dodia, R., Kotlia, B. S., Razdan, H. and Sahni, A. 1989 The Plio-Pleistocene geologic and climatic record of the Kashmir valley, India: A review and new data. Palaeogeography, Palaeoclimatology, Palaeoecology 73: 267–286.CrossRefGoogle Scholar
Agrawal, D. P., Gupta, S. K. and Kusumgar, S. 1971 Tata Institute radiocarbon date list IX. Radiocarbon 13(2): 442–449.Google Scholar
Bhandari, N., Nijampurkar, V. N., Shukla, P. N. and Puri, M. K. 1982 Deposition of Chinese nuclear debris in Changme Khnagpu Glacier, Sikkim. Current Science 51(8): 416–418.Google Scholar
Figgins, P. E. 1961 The radiochemistry of polonium. National Research Council Nuclear Science Series NAS - NS 3037. Washington DC, National Academy of Sciences.Google Scholar
Krishnaswami, S., Lal, D., Martin, J. M. and Meybeck, M. 1971 Geochronology of lake sediments. Earth and Planetary Science Letters 11: 407–414.CrossRefGoogle Scholar
Kusumgar, S., Agrawal, D. P., Juyal, N. and Sharma, P. 1986 Palaeosols within loess: Dating palaeoclimatic events in Kashmir. In Stuiver, M. and Kra, R. S., eds., Proceedings of the 10th International 14C Conference. Radiocarbon 28(2A): 561–565.Google Scholar
Kusumgar, S., Lal, D. and Sharma, V. K. 1963 Radiocarbon dating techniques. Proceedings of Indian Academy of Science 58: 125–145.Google Scholar
Mackereth, F. J. H. 1958 A portable core sampler for lake deposits. Limnology and Oceanography 3: 181–191.CrossRefGoogle Scholar
Nakai, N. and Koyama, M. 1987 Reconstruction of Palaeoenvironment from the view points of the inorganic constituents, C/N ratio and carbon isotopic ratio in the 1400 m core taken from Lake Biwa. In Horie, S., ed., History of Lake Biwa. Kyoto, Japan, Kyoto University: 137–155.Google Scholar
Oldfield, F., Battarbee, R. W. and Dearing, J. A. 1983 New approaches to recent environmental changes. The Geographical Journal 149(2): 167–181.Google Scholar
Swain, E. B. 1985 Measurement and interpretation of sedimentation of sedimentary pigments. Freshwater Biology 15: 53–75.CrossRefGoogle Scholar
Zutshi, D. P. and Khan, M. A. 1978 On the Lake topology of Kashmir. Environmental physiology and ecology of plants. In Singh, T. V. and Kaur, J., eds., Studies in the Eco-development of the Himalayas Mountain and Men. Lucknow, India, Print House: 465–472.Google Scholar