The eclogite engine; Top-down geochemistry
2008
Properties of Bullen’s Region C (400-1000 km) are used
to test mantle stratification models (whole-mantle, two-layer,
superplume, marble-cake, hole-in-the-floor, water-filter). Top-down
models involving eclogite and continent recycling plus
irreversible deep subduction [1, 2] are favored. Density-velocity
correlations, transition zone (TZ) thickness and
petrology imply radial and lateral changes in lithology and
homologous temperature. Injection of warm lower crust into
the mantle [3] explains the volume, and compositions, of
hotspot magmatism. Massive crustal delamination has
previously been ignored in favor of plume injections of
ancient MORB.
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