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Geology; June 2000; v. 28; no. 6; p. 515-518; DOI: 10.1130/0091-7613(2000)28<515:SAANPR>2.0.CO;2
© 2000 Geological Society of America
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Sclerosponges as a new potential recorder of environmental changes: Lead in Ceratoporella nicholsoni

Claire E. Lazareth*,1, Philippe Willenz*,2, Jacques Navez*,3, Eddy Keppens*,4, Frank Dehairs*,1 and Luc André*,3

1 Analytical Chemistry Department, Vrije Universiteit Brussel, B-1040 Brussels, Belgium
2 Department of Invertebrates, Royal Belgian Institute of Natural Sciences, B-1000 Brussels, Belgium
3 Section of Petrography-Mineralogy-Geochemistry, Royal Museum for Central Africa, B-3080 Tervuren, Belgium
4 Geology Department, Vrije Universiteit Brussel, B-1040 Brussels, Belgium

Lead concentrations have been analyzed on a 223 yr profile through the aragonitic skeleton of the reef-building Caribbean sclerosponge Ceratoporella nicholsoni by using laser-ablation inductively coupled plasma–mass spectrometry. A parallel study of the {delta}13C distribution in the skeleton validates the previously established mean annual growth rate of 230 µm/yr, at least for long-term important environmental changes. The Pb trend in the specimen displays a general increase from 0.30 ppm ca. A.D. 1760 to 2.15 ppm ca. A.D. 1984; a major threefold increase occurred after 1930. This Pb profile is analogous to results acquired from ice or coral cores and clearly highlights the potential of sclerosponges as a new proxy of environmental changes for time series extending over several centuries.

Key Words: coralline sponge • lead • global change • LA-ICP-MS • carbonate




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