Constraints on continental growth models from Nb/U ratios in the 3.5 Ga Barbarton and other Archaean basalt-komatiite suites
The average Nb/U ratio of modern mid-ocean ridge and oceanic island basalts (MORBs and OIBs) is 47 compared with 34 for the primitive mantle and this difference is attributed to the separation of the continental crust from the mantle. Variation in the Nb/U ratio in basalts of different ages can therefore be used to identify the time at which the bulk of the continental crust separated from the mantle. This study reports Nb/U ratios for a suite of 3.5 Ga basalts and komatiites from the Barberton...[Show more]
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|Source:||American Journal of Science|
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