Abstract
87Sr/ 86Sr ratios of basalts from islands in the Indian Ocean (0.7040) are higher than those of basalts dredged from the Mid-Indian Ocean Ridge (0.7034). The sources of the island basalts have apparently not been in equilibrium with the source of the ridge basalts for roughly 10 9 years. Both ridge and island basalts in the Indian Ocean are higher in 87Sr/ 86Sr than are rocks from similar settings in the eastern Pacific.
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