Why broad fields of volcanism are found in the interior of tectonic plates is hard to explain. Spatial correlations between sheared mantle flow and volcanism suggest that differential motion between surface plates and the mantle generates upwelling and melt.
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King, S. Eruptions above mantle shear. Nature Geosci 4, 279–280 (2011). https://doi.org/10.1038/ngeo1135
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DOI: https://doi.org/10.1038/ngeo1135
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