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洋岛玄武岩(OIB)岩套在地球化学上特别不同。这为许多洋岛或岛群的火山间的各种放射性同位素比值所证实。用3—4个端员组分可解释OIB以内的同位素不均匀性。具特高的Pb同位素比值的OIB来自较高的~(238)U/~
Oceanic basalt (OIB) rock sets are particularly geochemically different. This is evidenced by the various radioisotope ratios of volcanic rocks on many oceanic islands or island groups. 3-4 member components can explain isotope heterogeneity within the OIB. The OIB with the highest Pb isotopic ratio is from ~ 238 U / ~