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Petrology of the lowermost mantle

By Paul D. Asimow, D. Sun, J. A. Akins, S. N. Luo and T. J. Ahrens


Seismic observations of the thermal boundary layer above\ud the core-mantle boundary (CMB), including Ultra-Low\ud Velocity Zones and D" discontinuities with velocity jumps of\ud either sign, suggest that the bottom of the mantle may be\ud compositionally distinct and, in places, partially molten[1].\ud Our new shock-wave data constrain the melting curve and\ud liquid equation of state (EOS) of the key lower mantle\ud component MgSiO_3 perovskite and suggest neutral or negative\ud buoyancy of this melt at CMB pressure

Publisher: Elsevier
Year: 2004
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Provided by: Caltech Authors
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