Stephen C. Ruppel, Eric W. James, James E. Barrick, Godfrey Nowlan, T. T. Uyeno; High-resolution 87Sr/86Sr chemostratigraphy of the Silurian: Implications for event correlation and strontium flux. Geology ; 24 (9): 831–834. doi: https://doi.org/10.1130/0091-7613(1996)024<0831:HRSSCO>2.3.CO;2
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Analyses of 87Sr/86Sr in Silurian conodonts recovered from localities in North America and Europe representing 13 of the 14 defined Silurian conodont zones provide a high-resolution record of seawater chemistry for the Silurian Period. These data, which are characterized by little or no scatter, depict several high-frequency cycles superimposed on a gradual longer term rise in 87Sr/86Sr for the Silurian. High-frequency cycles have a duration of about one conodont zone, and many correlate with sequence boundaries recognized around the world. These data provide a much higher resolution image of secular changes in 87Sr/86Sr during the Silurian and may require a rethinking of models of strontium isotope flux in marine basins.