The variation of the marine ratio during Phanerozonic time: interpretation using a flux model |
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Authors: | Garrett W Brass |
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Institution: | Department of Geology, Yale University, New Haven, Connecticut 06520, U.S.A. |
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Abstract: | The ratio in sea water has varied over geologic time due to the addition of strontium to the sea from rocks with a variety of ratios. The measurements by Petermanet al. (Geochim. Cosmochim. Acta34, 105–120, 1970) of the value of the marine ratio have been confirmed by several other workers and by some new measurements on JOIDES samples. They form the basis of a model calculation of the relative proportions of ‘basaltic’ () and ‘granitic’ () strontium being supplied to the sea. For the last 200 million years, the proportions of these two sources appear to reflect the history of global tectonics; ‘basaltic’ during rifting and increasingly ‘granitic’ during the present episodes of uplift and continental collision |
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