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SubsolidusandmeltingexperimentsofaK-richbasalticcompositionhavebeenper- 2wt%)at6¤C12.5GPaandabove22.5GPa,respectively.Bothpyroxeneandgarnetma actasmainreservoirsforKinthemantle.Sanidine(KAlSi O )or...
ThephasediagramforMgSiO wasestimatedusingtheentropy,enthalpy,thermalex-3 pansivity,andvolumesofallthephases.Entropyatthevarious P-T conditionsinthephase diagramwasestimatedusingstatisticalthermodyna...
The high pressure phase transitions and melting of the mantle mineral MgSiO3 with the perovskite structure were investigated using molecular dynamics (MD) simulations of a large system of atoms on a p...
A new spinelloid polytype with a composition Fe2.45Si0.55O4 has been synthesized at 1100 8C and 5.6 GPa that is isostructural with wadsleyite [b2(Mg,Fe)2SiO4 ]. The refined param-eters (space group I...
OneclassofmodelsfortheearlyhistoryoftheEarthrequiresthepresent-dayinventory ofsiderophileelementsinthemantletohavebeenestablishedbyequilibriumpartitioning betweencore-formingmetalandmantlemineralsat...
Single-crystalX-raydiffractiondatahavebeenobtainedforcrystalsoftheFanalogof superhydrousphaseB,MgSi O F .Twinnedcrystalsweresynthesizedusingasplit- sphereanvilapparatus(USSA-2000)atpressuresbetween1...
ThefullelasticconstanttensoroforthorhombicMgSiO perovskitehasbeendetermined from?rstprinciplesforthe?rsttimeathighpressureusingtheplane-wavepseudopotential method.Theathermalelasticmoduli,determined...
The dissolved H20 concentrations of experimentally produced, Fe-free, nominally an-hydrous minerals (NAMs) have been measured using, for the first time, IH magic-angle-spinning NMR spectroscopy. Atlea...
First-principleslinear-response calculations wereusedto investigate the lattice dynamics ofwhatis thought to be the third mostabundant phase in the lower mantle,CaSi03 perovskite.Thecommonly assumed c...
Navon et al. (1996) demonstrated that the Navon and Stolper (1987) model can be formulated to reproduce a pattern oflight-ion lithophile trace element (LIL) enrichments produced by a single, small-sca...
Nielson and Wilshire (1993) promised a review of geochemically based models for magma transport and metasomatism in the mantle. However, they focused ondiscrediting the chromatographic modelofNavon an...

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