Sedimentation rates and heavy metals in a macrotidal salt marsh: Bay of Fundy,Canada |
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| Authors: | Ray Kostaschuk Zhongyuan Chen Yoshiki Saito Zhangqiao Wang |
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| Institution: | (1) Department of Geography, University of Guelph, Guelph, ON, N1G 2W1, Canada;(2) State Key Laboratory for Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;(3) MRE, Geological Survey of Japan, AIST, Higashi 1-1-1, Tsukuba Ibaraki, 306-8567, Japan;(4) Department of Geography, East China Normal University, Shanghai, 200062, China |
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| Abstract: | Macrotidal salt marshes play an important role in sedimentary processes in estuaries and can act as a sink for fine sediments
and contaminants. This study examines sedimentation rates and the history of heavy metal accumulation in the Allen Creek salt
marsh in the Bay of Fundy, Canada. Pb-210 and Cs-137 measurements and accelerated mass spectrometer (AMS) dating indicate
a sedimentation rate of about 1.1 cm/year, which is consistent with independent observations. Elevated normalized concentrations
of As in the upper section of the deposit may reflect an increase in organic matter content while a consistent decrease in
Mn toward the surface of the section may be due to a decrease in natural supply. A peak in metal concentrations in the early
to mid twentieth century is attributed to inputs from local foundries. |
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