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Although most ocean island basalts (OIB) are enriched in incompatible elements relative to mid-ocean ridge basalts, OIB depleted in these elements also occur on some islands. The Ninetyeast Ridge (NER) in the eastern Indian Ocean is a 5000 km long hotspot track defined by submarine basaltic volcanoes that were islands when they formed from 43 to 77 Ma. A subset of NER basalts, described as depleted,...