87Sr/86Sr composition of seawater during the Phanerozoic |
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Authors: | Ján Veizer William Compston |
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Affiliation: | Department of Geology, University of Ottawa, Ottawa 2, Ontario, Canada;Research School of Earth Sciences, Australian National University, Canberra A.C.T., Australia |
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Abstract: | measurements of 108 sedimentary carbonate rocks have been used to trace variations in the strontium isotopic composition of seawater during the Phanerozoic. The lowest 87Sr/86Sr observed for any suite of carbonates is taken as the best approximation to the value in well-mixed contemporary seawater. Our data support the existence of low in the Cretaceous and Late Jurassic but they do not support further structure beyond a general trend through the Phanerozoic, which may correlate with the continental denudation rate. |
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