Sub-continental lithospheric mantle (SCLM) is interpreted by many to be mantle that began life as DMM, then melted in a plume or subduction zone environment, and finally became emplaced under continental crust (Maaloe and Aoki, 1977; Boyd and Mertzman, 1987). This interpretation is based on both the spatial relations between crust and lithospheric mantle, and the observation that most lithospheric mantle is depleted in its basaltic component (Jordan, 1978). The formation of SCLM results in mantle that is chemically distinct, buoyant, and (at least for a time) physically isolated from the DMM. It is accessible...

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