Phase transformations and seismic structure in the upper mantle and transition zone Carl B. Agee ... View articletitled, Phase transformations and seismic structure in the upper mantle and transition zone ...

High-pressure Raman spectroscopic study of post-aragonite phase transition in witherite (BaCO 3 ) Chung-Cherng Lin; Chung- ... Chung-Cherng Lin, Lin-gun Liu; High-pressure Raman spectroscopic study of post-aragonite phase transition in witherite (BaCO 3 ... Crystal chemistry and phase relations of orthorhombic carbonates Reviews in Mineralogy and Geochemistry ...

Stability, composition, and crystal structure of Fe-bearing Phase E in the transition zone American Mineralogist ... Carbonatitic melt metasomatism in the deep transition zone may lead to local Na-enrichment, and ringwoodite may be an important ... Al is highly enriched in bridgmanite relative to the other coexisting phases. ... host for Na in the deep transition zone. Subsequent convection or subduction of metasomatized mantle may lead to enrichment of ...

Phase transitions of minerals in the transition zone and upper part of the lower mantle Advances in High-Pressure Mineralogy ... Discovery of post-perovskite phase transition and implications for the nature of the D″ layer of the mantle Advances in High- ... Phase-relation studies of mantle minerals by in situ X-ray diffraction using multianvil apparatus Advances in High-Pressure ... Thermodynamic Properties and Phase Relations in Mantle Minerals Investigated by First Principles Quasiharmonic Theory Reviews ...

Systematic clustering of small neoblasts was interpreted as evidence for high-pressure phase transitions at Meteor Crater ( ...

Thermochemistry and high-pressure equilibria of the post-perovskite phase transition in CaIrO3 Hiroshi Kojitani; Asuka Furukawa ... View articletitled, Thermochemistry and high-pressure equilibria of the post-perovskite phase transition in CaIrO,sub,3,/sub, ... Reversed phase equilibrium constraints on the stability of Mg-Fe-Al biotite R.G. Berman; L. Ya. Aranovich; D.G. Rancourt; P.H.J ... An evaluation of synthetic fluid inclusions for the purpose of trapping equilibrated, coexisting, immiscible fluid phases at ...

Evidence for an I 2/ a to Imab phase transition in the silica polymorph moganite at ~570 K American Mineralogist ... Phase-relation studies of mantle minerals by in situ X-ray diffraction using multianvil apparatus Advances in High-Pressure ...

... one at which an Fe-Ti order-disorder transition pierces the peak of a two-phase field; and a second at which the two phase ... A theoretical model of equilibrium phase relations in the system Fe2O3-FeTiO3 is presented. This model is based on the single ... Below this latter point, the two-phase field is predicted to bulge out, towards Fe2O3, and it is argued that this feature ... A low-temperature phase diagram for ilmenite-rich compositions in the system Fe 2 O 3 -FeTiO 3 American Mineralogist ...

... which is typical for phase transitions and similar to twinning observed in back reactions of a high-pressure assemblage of Fe4O ... The most common non-diamond phases found in PDAs are garnets, followed by clinopyroxenes, but other phases can be present in ... Noteworthy, PDAs also contain protogenetic and epigenetic phases in addition to syngenetic phases which highlights the need for ... and also a suite of very reducing phases, such as SiC, TiN, and Fe, Fe-Ni, W-Fe-Cr-V, Ni-Cr, Si, Sn metallic and alloyed phases ...

... c phase transition between 1.48 and 1.75 GPa (Hugh-Jones et al. 1994), we observe further transition between 30 and 36 GPa into ... A new high-pressure phase transition in clinoferrosilite: In situ single-crystal X-ray diffraction study Anna Pakhomova; Anna ... A new high-pressure phase transition in natural Fe-bearing orthoenstatite American Mineralogist ... A new high-pressure phase transition in clinoferrosilite: In situ single-crystal X-ray diffraction study. American Mineralogist ...

... resulting in micro-hardgrounds that vertically separate discrete phases of infill. The remaining pore space is filled with an ... How Complete Is the K/P Boundary Transition in the Deep Sea?. The K/P boundary transition has been documented in over 300 ... We compared the Kambühel shallow-water K/P boundary transition with similar shallow-water transitions globally and with the ... Lithology of the K/P Transition. At Kambühel, Upper Maastrichtian limestones below the K/P boundary are gray- to red-colored, ...

The HySo phase, Mg3Al(OH)3(Si2O7), is a dense layered sorosilicate, [ρ0 = 3.13 g/cm3 and K0 = 120.6(6) GPa] with an average ... The 11.5 Å phase, Mg6Al(OH)7(SiO4)2, is a hydrous layer structure. It presents incomplete tetrahedral sheets and face-sharing ... In aluminum-bearing systems, chlorite is considered the most important hydrous phase at the top of the subducting plate, and ... A possible new Al-bearing hydrous Mg-silicate (23 Å phase) in the deep upper mantle American Mineralogist ...

Novel phase transition in orthoenstatite Jennifer M. Jackson, Stanislav V. Sinogeikin, Michael A. Carpenter, Jay D. Bass ... A new high-pressure phase transition in natural Fe-bearing orthoenstatite Jin S. Zhang, Przemyslaw Dera, Jay D. Bass ... Pressure-induced Pbca - P 2 1 / c phase transition of natural orthoenstatite: Compositional effect and its geophysical ... Single-crystal elastic properties of dense hydrous magnesium silicate phase A Carmen Sanchez-Valle, Stanislav V. Sinogeikin, ...

... dependence in the ferromagnetic phase at 20 GPa, whereas the linearity is confirmed in the non-magnetic phase. In addition to ... The results indicate a discontinuous volume change at the magnetic transition and almost no compositional (x) ...

Sound velocities across calcite phase transitions by Brillouin scattering spectroscopy Chao-shuai Zhao, He-ping Li, Po-fei Chen ...

Phase transitions in the grandite garnets Dorian M. Hatch, Dana T. Griffen ...

Probing Phase Transitions and Magnetism in Minerals with Neutrons Bryan C. Chakoumakos; John B. Parise ... View articletitled, Probing Phase Transitions and Magnetism in Minerals with Neutrons ... Phase Equilibrium Modelling: Approaches and Pitfalls Report on the On-Line Workshop ... View articletitled, Phase Equilibrium Modelling: Approaches and Pitfalls Report on the On-Line Workshop ...

OLIVINE-SPINEL TRANSITION IN FAYALITE GSA Bulletin. Equilibrium between vapor and liquid phases in the system CO 2 -H 2 O-K 2 O ...

... and transport water together with Al into the deep upper mantle or even into the upper part of the transition zone. ... phase A [Mg7Si2O8(OH)6] + Al2O3 + H2O. The chemical composition of this new 23 Å phase is Mg11Al2Si4O16(OH)12, and it contains ... A possible new Al-bearing hydrous Mg-silicate (23 Å phase) in the deep upper mantle† Nao Cai; Nao Cai * ... A new Al-bearing hydrous Mg-silicate that we named as 23 Å phase was synthesized at 10 GPa and 1000 °C, while also coexisting ...

Antiferroelectric phase transition in titanite: Excess entropy and short range order Stuart A. Hayward; Jaime del Cerro; Ekhard ... View articletitled, Antiferroelectric phase transition in titanite: Excess entropy and short range order ... Structure of a new Al-rich phase, [K, Na]0.9[Mg, Fe]2[Mg, Fe, Al, Si]6O12, synthesized at 24 GPa Tibor Gasparik; Akhilesh ... View articletitled, Structure of a new Al-rich phase, [K, Na],sub,0.9,/sub,[Mg, Fe],sub,2,/sub,[Mg, Fe, Al, Si],sub,6,/sub,O, ...

TEM-investigation of the sanidine/microcline transition across metamorphic zones; the K-feldspar varieties H. U. Bambauer; H. U ... H. U. Bambauer, C. Krause, H. Kroll; TEM-investigation of the sanidine/microcline transition across metamorphic zones; the K- ...

New pressure-induced phase transition to Co 2 Si-type Fe 2 P Yoichi Nakajima, Shunya Araki, Daisuke Kinoshita, Kei Hirose, ... Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets Yuto ... High-pressure experiments on phase transition boundaries between corundum, Rh 2 O 3 (II)-and CaIrO 3 -type structures in Al 2 O ... Acoustic velocity measurements for stishovite across the post-stishovite phase transition under deviatoric stress: Implications ...

The crust-mantle transition appears to be sharp, jumping from 6.1 to 7.9 km/sec. The amplitude behavior of Pn shows little ... and the Pg phases are examined. Pg is demonstrated to be composed of the primary P reflection from the mantle and contains ...

Structural modulation and phase transition in a Na-rich alkali feldspar Huifang Xu, David R. Veblen, Yiqiang Zhang ...

... show two main phases of growth with an apparent unconformity separating an older phase of reef initiation ca. 2000 cal. yr B.P ... Transitions in coral reef accretion rates linked to intrinsic ecological shifts on turbid-zone nearshore reefs Kyle M. Morgan; ... Kyle M. Morgan, Chris T. Perry, Scott G. Smithers, Jamie A. Johnson, Pauline Gulliver; Transitions in coral reef accretion ... 2 and 3B). This transition corresponds with a decrease in contemporary coral cover (to 25%) and a change in coral community ...

The P 2 1 / m - C 2/ m phase transition in synthetic amphiboles in the system Li 2 O-Na 2 O-MgO-SiO 2 -H 2 O: a high- T FTIR ...

Cordierite under hydrostatic compression: Anomalous elastic behavior as a precursor for a pressure-induced phase transition ... Fe 3+ spin transition in CaFe 2 O 4 at high pressure Marco Merlini, Michael Hanfland, Mauro Gemmi, Simo Huotari, Laura ... High-pressure behavior of åkermanite and gehlenite and phase stability of the normal structure in melilites Marco Merlini, ...

Thermodynamics of the R 3̅ to R 3̅ c phase transition in the ilmenite-hematite solid solution Richard J. Harrison, Udo Becker, ... In-situ study of the R 3̅ to R 3̅ c phase transition in the ilmenite-hematite solid solution using time-of-flight neutron ... An investigation of the phase transitions in bornite (Cu 5 FeS 4 ) using neutron diffraction and differential scanning ...

The dating of a dyke to ~28 Ma indicates the presence of an older Oligocene volcanic phase, whose products have been almost ... partial melting of a heterogeneous sub-lithospheric mantle close to the spinel-garnet transition at ~70-90 km depth. Trace ... basalts indicates that the existence of two distinct volcanic phases should be reconsidered. ...

Katbergia, a burrow used by others as an indicator of the transition and post-transition interval, occurs in paleosols much ... The scenario envisions vegetational collapse that resulted in a phased extinction of vertebrate taxa in the uppermost ...