Definitions
Ocean island basalts (generally referred to as OIBs) are a type of basalt erupted within the oceans, mainly in intraplate settings. Thus, OIB volcanism contrasts with the other principal types of volcanism in the ocean basins that occur along plate boundaries: mid-ocean ridge basalt (MORB) volcanism , where basalt is erupted at divergent plate boundaries, and subduction zone (or arc) volcanism, where lavas are formed in association with subduction at convergent plate boundaries. OIBs are erupted at volcanic hotspots, which correspond to the surface location of upwelling mantle plumes. Mantle plumes are buoyantly upwelling regions of the mantle that are thought to have unusually high mantle temperatures.
OIB, Hotspots, and Mantle Plumes
Many hotspots are located in intraplate settings in the oceans. However, some hotspots are colocated with mid-ocean ridges (e.g., Iceland hotspot), and at least one hotspot is located near a subduction zone, and complicated plume-trench...
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Jackson, M.G. (2016). Oceanic Island Basalts. In: White, W. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39193-9_248-1
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DOI: https://doi.org/10.1007/978-3-319-39193-9_248-1
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