Exercise Isotope compositions of MORB

Although broadly very similar, there are slight differences in the Nd-Sr isotope composition of mid-ocean ridge basalts from the Atlantic, Pacific and Indian Oceans. Related to the overall averaged trace element composition of MORBs as shown on overheads #60 & #61, are these slight differences as you would expect them? What might be the reason for the few fairly low εNd (at markedly increased ⁸⁷Sr/⁸⁶Sr) datapoints reported for MORB from the Indian Ocean?

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