Abstract

The accumulation rate of sediments in the Saguenay Fjord, Quebec, Canada, established from 137Cs activity measured in 19 cores, varies between > 1.0 cm/year upstream and 0.2 cm/year downstream. Cesium-137 profiles in cores from the northern basin follow that of fallouts on the ground and reflect the impact of a sudden inflow of clay from a major mudslide. However, 137Cs accumulation in the larger basin seems less sensitive to external influences.Carbon content and the C/N ratio are higher upstream than downstream. Based on 137Cs dating, core sections show carbon contents that reflect changes caused by the forest industry over the years. [Journal Translation]

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