Challenges To The Plume Model
The weak visibility of the postulated plume in tomographic images of the lower mantle and the geochemical evidence for eclogite in the mantle source have led to the theory that Iceland is not underlain by a mantle plume at all, but that the volcanism there results from processes related to plate tectonics, and is restricted to the upper mantle.
Read more about this topic: Iceland Plume
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