Mathematics – Logic
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..721b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 7, pp.721-730
Mathematics
Logic
34
Scientific paper
The 87 Sr / 86 Sr ratio in sea water has varied over geologic time due to the addition of strontium to the sea from rocks with a variety of 87 Sr / 86 Sr ratios. The measurements by et al. (Geochim. Cosmochim. Acta 34 , 105-120, 1970) of the value of the marine 87 Sr / 86 Sr 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' ( 87 Sr / 86 Sr = 0.704) and `granitic' ( 87 Sr / 86 Sr = 0.718) 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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