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The Holocene
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Sewage history in the anoxic sediments of the fjord Nordåsvannet, western Norway: (I) dating and trace-metal accumulation

Matthias Paetzel

Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway, NGU (Norwegian Geological Survey), Trondheim, Norway

Hans Schrader

Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway, NGU (Norwegian Geological Survey), Trondheim, Norway

Ian Croudace

Department of Geology, University of Southampton, Hants, UK

A combined study involving lamina counting, 210Pb and the fallout- 137Cs dating techniques were used to date two sediment cores with intact sediment-water interfaces from the anoxic fjord Nordåsvannet. Averaged sedimentation rates, determined from radiometric measurements, range from 0.4 to 2.1mm yr-1 over the core with a higher rate at the top. The available lamina data support the sedimentation rate estimates made from radiometric measurements.

An increase was found in trace-metal concentrations (Zn: 90-807 ppm ; Cu: 30-176 ppm and Pb: 40-225 ppm) and mass accumulation rates (MAR; Zn: 0.003-0.10 g m2 yr -1, Cu: 0.001-0.02 g m2 yr-1 and Pb: 0.002-0.02 g m2 yr-1) across the upper 5 cm of the sediments. This increase coincides with the introduction of sewage effluent through two deep outlets at 40m water depth into the fjord at Fjøsanger and Skjold in 1969. The MAR suggest that the enhanced sewage supply has caused the metal enrichment in the Nordåsvannet bottom sediments after 1969.

Key Words: Sewage history • anoxic sediments • 210Pb-dating • 137Cs-dating • laminated sediments • fjord • trace metals • Cu • Pb • Zn • marine environment • human impact • Norway.

The Holocene, Vol. 4, No. 3, 290-298 (1994)
DOI: 10.1177/095968369400400308
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[Abstract] [PDF]