East Gotland Deep

Partly overlapping radiographs of the upper, middle, and lower part of core EGD from a depth of 240 m in the East Gotland Deep (station no. 171).

Thin, horizontal, somewhat irregular laminae characterize especially the bottom part of the core. Some of the harder (lighter) laminae may be caused by the precipitation of CaCO₃. The concentration of larger aggregates is most pronounced at a core depth of about 25 cm.

Downcore variations in content of solids in sediment core EGD.

In this 59 cm long core the mean value of the dry bulk density amounted to 0.213, corresponding to a wet bulk density of 1.15 and to a porosity of 92 %.

Downcore variations in content of solids in the uppermost part of core EGD.

The void ratio is very high in the upper, flocculated and underconsolidated part of this core. For the uppermost 4 cm the mean dry bulk density is only 0.007 and the mean water content as high as 99.3 % of the wet weight. The three uppermost layers  (below the topmost layer), probably representing the "sedimentological" years 1992, 1991, and 1990, had a mean thickness of 15 mm and a mean content of solids of 0.031 g/cm².

Radiographically calculated sedimentation-compression curve down to a depth of 59 cm in core EGD. E.o.p. = effective overburden pressure. From Axelsson, V., 1997: X-ray radiographic studies of sediment cores from the Baltic Sea. SGU series Ca 86.

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