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Abstract

The central question discussed by Gudmundsson [this issue] can be succinctly stated: "Is the temperature of the shallowest upper mantle of Iceland at the peridotite solidus" (nominally, 1200°C). The traditional view, as developed by numerous authors during the 1970s and early 1980s (reviewed by Palmason [1986]) and to which Gudmundsson ascribes, is that it is supersolidus and partially molten.