Figure 2. The thermomagnetic curves plotted for the induced magnetization in the pressure field of 0.2 T of the rock samples collected in the Naroch Lake (N-802 and N-1040) and in the Svir Lake (S-1601 and S-1901). The curves of the first (1) and second (2) heating were normalized using the maximum magnetization value. Shown for each sample is the ratio between the induced magnetization values at room temperature in the field of 0.2 T before and after the heating to 700oC.