The vertical distribution of salinity, δ18O, δD (left panel) and H
S content, δ34S (H
S) and δ34S (SO
) (right panel) in the lower part (>1200 m) of the stations 3426 and 100–50 water column. The dashed lines show the upper boundary of the BCL. The data on δ34S (H2S) value from , [14, 21] and  are also presented. The lowest δ34S (H2S) value from  is shown for sulfur isotope composition of hydrogen sulfide from pore water (10–18 cm depth of sediments at station 8).