Lake Saggat

Radiographs of core 558 from a depth of 71 m in the central part of Lake Saggat. The letters O and B mark corresponding levels on the partly overlapping radiographs.

According to caesium-137 measurements the mean annual rate of sedimentation at this coring station amounted to 0.2 kg of solids/m2 during the period 1963 - 1979, corresponding to a linear annual sedimentation rate of 1.5 mm in the uppermost part of this core.

Depth in cm
Solids, mg/cm3
Solids, cum. g/cm2
Bulk density
E.o.p., g/cm2
Porosity in %
Void ratio
0.05
001
0.000
1.001
0.000
99.9
342.52
0.10
003
0.000
1.002
0.000
99.9
269.11
0.15
007
0.001
1.005
0.000
99.7
179.33
0.20
021
0.002
1.013
0.001
99.2
85.37
0.25
035
0.003
1.022
0.002
98.7
56.66
0.30
072
0.007
1.045
0.004
97.3
29.90
0.35
087
0.011
1.055
0.007
96.8
24.91
0.40
096
0.016
1.060
0.010
96.4
22.84
0.45
100
0.021
1.062
0.013
96.3
22.10
0.50
101
0.026
1.063
0.016
96.3
21.79
0.55
107
0.032
1.066
0.020
96.1
20.76
0.60
112
0.037
1.070
0.023
95.9
19.87
0.65
115
0.043
1.071
0.027
95.8
19.38
0.70
119
0.049
1.074
0.030
95.6
18.82
0.75
123
0.055
1.076
0.034
95.5
18.22
0.80
126
0.062
1.078
0.038
95.4
17.84
0.85
128
0.068
1.080
0.042
95.3
17.52
0.90
131
0.075
1.082
0.046
95.2
17.13
0.95
135
0.081
1.084
0.050
95.0
16.70
1.00
138
0.088
1.086
0.055
94.9
16.33

Sediment core 558, 0 - 1 cm (Lake Saggat, station no. 18). Vertical variation in some selected, density -related values (radiographically calculated). E.o.p. = effective overburden pressure.

The vertical variation in density-related sedimentological parameters is calculated from the variations in the film density along the radiation images of the sediment cores and the aluminium wedge (used for density calibration). The accuracy of the calculations increases with decreasing density of the deposits, since the results are a function of the difference in density between bottom water and sediment.

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