Abstract
Inclusion of a runout Sr term in the equation for the isotopic budget of seawater provides a better understanding of the cause for the lack of correlation between sea-level changes and the isotopic variations of Sr in seawater during the Phanerozoic Eon. Continental unions and break-ups that change the length of coastlines can greatly alter the flux of runout Sr. The estimate for the present-day flux of runout Sr is (1.9–2.0) · 10 12 g a −1. Taking the runout Sr as an additional component of continental Sr delivered to the oceans, the flux of Sr from ridge basalts at hydrothermal centers is estimated at ∼ 1.27 · 10 12 g a −1.
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