Geophysically constrained mantle mass flows and the 40Ar budget: a degassed lower mantle?
It has been inferred previously that the lower mantle is much less degassed than the upper mantle, by about two orders of magnitude, based on estimates of the amount of 40Ar expected to have been generated during earth history. Such a gas-rich lower mantle would severely limit the permissible mass flow rate into the upper mantle. However a gas-rich lower mantle conflicts with evidence from refractory trace elements and their isotopes that most of the mantle has been processed, and with...[Show more]
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|Source:||Earth and Planetary Science Letters|
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