> 
Paris, March 9, 2006
Why is the earth's mantle like a marble cake ?
Notes :
(1) Plasma source mass spectrometer with inductive coupling.
(2) The mantle is formed of different rocks, which correspond either to original material, or to residues from melting earlier ridge basalts, buried in the lower mantle by subduction.
(3) The process by which one lithospheric ocean plate slides under another traveling in the opposite direction.
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