Abstract
Based on a total dissolved load of 160 ppm, an erosion rate of 7,056 · 10 10 kg/year has been calculated for the St. Lawrence basin. The St. Lawrence river contributes 0.24% of the continental runoff to the world oceans. The water chemistry of the estuary suggests the presence of two water masses. While the dissolved silicates and Mn behave conservatively with respect to salinity, Fe shows a strong non-conservative behavior possibly due to the presence of a turbidity front and other dynamic processes in the estuary. Trace metals such as Co, Ni and Zn are enriched nearly ten times in the fresh water as compared to the estuarine waters. The water composition plotted in the alumino-silicate system indicates that kaolinite, illite, Mg-chlorite and microcline can be expected to be present in the sediments. Mineralogical observations on the suspended matter and sediments agree with this prediction.
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