Barium uptake into the shells of the common mussel (Mytilus edulis) and the potential for estuarine paleo-chemistry reconstruction |
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| Authors: | David P Gillikin Frank Dehairs Dirk Steenmans Luc André |
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| Institution: | a Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
b Section of Mineralogy and Petrography, Royal Museum for Central Africa, Leuvensesteenweg 13, B-3080 Tervuren, Belgium |
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| Abstract: | In this study we test if calcite shells of the common mussel, Mytilus edulis, contain barium in proportion to the water in which they grew. Similar to all bivalves analyzed to date, the Ba/Ca]shell profiles are characterized by a relatively flat background Ba/Ca]shell, interrupted by sharp Ba/Ca]shell peaks. Previous studies have focused on these Ba/Ca]shell peaks, but not on the background Ba/Ca]shell. We show that in both laboratory and field experiments, there is a direct relationship between the background Ba/Ca]shell and Ba/Ca]water in M. edulis shells. The laboratory and field data provided background Ba/Ca partition coefficients (DBa) of 0.10 ± 0.02 and 0.071 ± 0.001, respectively. This range is slightly higher than the DBa previously determined for inorganic calcite, and slightly lower than foraminiferal calcite. These data suggest that M. edulis shells can be used as an indicator of Ba/Ca]water, and therefore, fossil or archaeological M. edulis shells could be used to extend knowledge of estuarine dissolved Ba throughputs back in time. Moreover, considering the inverse relationship between Ba/Ca]water and salinity, background Ba/Ca]shell data could be used as an estuary specific indicator of salinity. The cause of the Ba/Ca]shell peaks is more confusing, both the laboratory and field experiments indicate that they cannot be used as a direct proxy of Ba/Ca]water or phytoplankton production, but may possibly be caused by barite ingestion. |
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