Strontium isotope ratios of planktonic foraminifera from sediment samples acroos the K/T boundary, supplement to: Martin, Ellen E; MacDougall, J Douglas (1991): Seawater Sr isotopes at the Cretaceous/Tertiary boundary. Earth and Planetary Science Letters, 104(2-4), 166-180

Ellen E Martin & J Douglas MacDougall
Seawater 87Sr/86Sr values increase abruptly by 28 * 10**-6 across the Cretaceous/Tertiary boundary (KTB). This small, but rapid shift is superimposed on the larger scale structure of the seawater Sr isotope curve. The time scale of radiogenic Sr addition appears to be too rapid to reconcile with sources associated with volcanism, and we show that the amount of Sr required to produce even this small increase is too large to be derived from: (1) a...
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