Lake Turingen

Radiographs of sediment cores.

Three of the X-rayed sediment cores were sampled in the southern part of lake Turingen in 1979-03-07. The length of the cores amounted (immediately after sampling) to 52 cm (core 483), 43 cm (core 484), and 40 cm (core 485).

Radiographic comparison between the upper part of cores 483 and 484 from a depth of 7 and 8 m respectively in lake Turingen .

The coring places 483 and 484 were situated about 400 and 550 m respectively in front of the mouth of the river Turingeån. The harder and more minerogenic (light) layers probably reflect periods with comparatively high suspended-sediment discharge in the river Turingeån, where among others, diggings have been carried out. The hardness index amounted to 1.5 in core 483 and to 1.4 in the somewhat softer core 484.

As shown by the biogenic structures in the X-radiographs the deposits are bioturbated. The tubelike structures contain deposits of less density (darker) then the surrounding deposits. The small, light spots mark the presence of minerogenic particles. The small, dark, more or less round or elliptical spots, mark the presence of gas in bubbleface in core 484.

The bottom deposits have earlier been heavily polluted by mercury. Therefore, in 2000-2003 a new remediation method - The Cover-method - was used to cap the contamined deposits in lake Turingen.

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