Abstract The 32Si concentration in a sample of surface ice from the snout of Changme-Khangpu glacier is 0.36 disintegrations per minute/tonne compared to the fall-out value of 0.7 d.p.m./tonne. If this decrease is assumed to be solely due to decay of 32Si, an age off c. 100 years is estimated for the surface ice of the snout, leading to an average flow velocity of c. 40 m/year for the past century. A vertical profile of 210Pb in a core taken at an altitude of 5040 m shows two horizons where this isotope is enriched, one between 3 and 4 m and another between 11 and 12 m, indicating that the primary concentration of 210Pb can change by physico-chemical processes like adsorption on dust. None the less, a longitudinal profile along the glacier shows a systematic decrease of 210Pb activity with decreasing altitude, the surface ice of the snout giving a value of 0.2 d.p.m./l, corresponding to an age of 100 years which is concordant with the 32Si age. This surface flow-rate of the glacier is much larger than the average contemporary flow-rate (c. 13m/year). The difference can be understood in terms of the past history of advance and recession of the glacier as revealed by the geomorphic evidence.
[1]
N. Bhandari,et al.
Oxygen isotopic ratios of some Himalayan glaciers
,
1984
.
[2]
P. N. Shukla,et al.
Ice accumulation rate in Changme-Khangpu glacier, Sikkim
,
1983,
Journal of Earth System Science.
[3]
C. Vohra,et al.
Radiometric Chronology of Some Himalayan Glaciers
,
1983
.
[4]
C. Vohra,et al.
Radiometric Chronology of Neh–nar Glacier, Kashmir
,
1982,
Journal of Glaciology.
[5]
R. Singh,et al.
Radiometric age of the snout ice of Nehnar glacier
,
1981
.
[6]
J. L. Yntema,et al.
Measurement of the /sup 32/Si half-life via accelerator mass spectrometry
,
1980
.
[7]
H. W. Fulbright,et al.
Half-life of Si-32 from tandem-accelerator mass spectrometry
,
1980
.
[8]
D. DeMaster.
The half life of32Si determined from a varved Gulf of California sediment core
,
1980
.
[9]
D. Lal,et al.
Annual fallout of32Si,210Pb,22Na,35S and7Be in rains in India
,
1979
.
[10]
H. Clausen.
Dating of Polar Ice By 32Si
,
1973,
Journal of Glaciology.
[11]
D. Lal,et al.
Cosmic ray produced isotopes and their application to problems in geophysics
,
1962
.