Depletion, Density, and Deposits through the mantle transition zone (MTZ)

Thorsten Joachim Nagel , Anders Vesterholt & Christian Schiffer
We present phase diagrams of variously enriched and depleted mantle rocks down to 800 kilometers depth and explore density as the parameter governing convection and compositional stratification. Some results are surprising and not all are included in present concepts and models: (1) Primitive and enriched mantle compositions are buoyant in the uppermost lower mantle compared to depleted mantle, especially, when they are warmer, but also at identical temperatures. Hence, if the upper mantle is depleted...
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