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The Mid-Atlantic Ridge (MAR) south of the Kane Fracture Zone at ∼23°N (the MARK area) is distant from hot spots and a type area for “normal” mid-ocean ridge basalt (N-MORB) depleted in highly incompatible elements. High-density sampling reveals that a small proportion of basalt are enriched in incompatible elements (enriched mid-ocean ridge basalts, E-MORB) from the MARK area. It is apparent that...
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