Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224305f&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 24, CiteID L24305
Physics
9
Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)
Scientific paper
The recently discovered phase transition for (Mg,Fe)SiO3 from perovskite to post-perovskite structure for pressure-temperature conditions in the lowermost mantle provides a plausible mechanism to explain a several percent shear velocity increase detected at the top of the D'' region in many regions. The phase transition has a large positive Clapeyron slope, and given the likely presence of a strong temperature increase just above the core-mantle boundary, D'' conditions may reintersect the phase boundary, resulting in a thin layer of perovskite below a lens of post-perovskite, separated by a few percent velocity decrease. Detection of such a velocity decrease is shown to be much harder than detection of the shallower velocity increase due to fundamental properties of seismic waves; purported observations in support of a double-discontinuity are re-evaluated based on waveform modeling. Waveform stacking procedures are required for reliable detection of the lower half of any double-crossing of the phase boundary.
Flores Claudia
Lay Thorne
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