Variability of trace elements in a daily banded coral
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概要
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We performed electron microprobe analysis of a fossil coral with an interval of 5 μm along the growth axis. The Na/Ca, Mg/Ca, S/Ca and Sr/Ca ratios fluctuate in a synchronous cycle of about 2 weeks. Diurnal or intradiurnal changes in elemental contents are also observed. The degree of the change in the Sr/Ca ratios is much bigger than the results of bulk measurements of coral skeletons (e. g.. Smith et al., 1979; Beck et al., 1992), and it is unlikely that the fluctuation is simply due to temperature change. While the mechanism which leads to the 2 weeks cyclicity is still unknown, the variation in calcification rate of the coral skeleton is a possible cause. It is possible that vital effects in the trace element incorporation in coral skeletons are more enhanced when observed at such a small scale. compared to bulk measurements techniques. The quality of reconstructions of short-lived environmental events using coral proxy records will be improved by a better understanding than we have at present of the mechanisms underlying the higher frequency changes in skeletal elemental ratios.
- 首都大学東京の論文
著者
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Tsukamoto Sumiko/tsukamoto
Environmental Geology Department Geological Survey Of Japan/environmental Geology Department Geologi
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Tsukamoto Sumiko
Environmental Geology Department, Geological Survey of Japan/Environmental Geology Department, Geological Survey of Japan