Phase Equilibrium Studies Relevant to Upper Mantle Petrology

2013 ◽  
pp. 634-637
Author(s):  
M. J. O'Hara
Keyword(s):  
Phase Equilibrium ◽  
Upper Mantle ◽  
Equilibrium Studies ◽  
Mantle Petrology

Petrology of ultramafic xenoliths from Rayfield River, south-central British Columbia

1987 ◽  
Vol 24 (8) ◽  
pp. 1679-1687 ◽  
Author(s):  
Dante Canil ◽  
Mark Brearley ◽  
Christopher M. Scarfe
Keyword(s):  
British Columbia ◽  
Phase Equilibrium ◽  
Partial Melting ◽  
Upper Mantle ◽  
Mantle Xenoliths ◽  
Spinel Lherzolite ◽  
Equilibrium Constraints ◽  
Host Magma ◽  
South Central ◽  
Ultramafic Xenoliths

One hundred mantle xenoliths were collected from a hawaiite flow of Miocene–Pliocene age near Rayfield River, south-central British Columbia. The massive host hawaiite contains subrounded xenoliths that range in size from 1 to 10 cm and show protogranular textures. Both Cr-diopside-bearing and Al-augite-bearing xenoliths are represented. The Cr-diopside-bearing xenolith suite consists of spinel lherzolite (64%), dunite (12%), websterite (12%), harzburgite (9%), and olivine websterite (3%). Banding and veining on a centimetre scale are present in four xenoliths. Partial melting at the grain boundaries of clinopyroxene is common and may be due to natural partial melting in the upper mantle, heating by the host magma during transport, or decompression during ascent.Microprobe analyses of the constituent minerals show that most of the xenoliths are well equilibrated. Olivine is Fo89 to Fo92, orthopyroxene is En90, and Cr diopside is Wo47En48Fs5. More Fe-rich pyroxene compositions are present in some of the websterite xenoliths. The Mg/(Mg + Fe2+) and Cr/(Cr + Al + Fe3+) ratios in spinel are uniform in individual xenoliths, but they vary from xenolith to xenolith. Equilibration temperatures for the xenoliths are 860–980 °C using the Wells geothermometer. The depth of equilibration estimated for the xenoliths using geophysical and phase equilibrium constraints is 30–40 km.

High-Pressure Phase Equilibrium Studies of Multicomponent (Alcohol-Water-Ionic Liquid-CO2) Systems

2020 ◽  
Vol 6 (1) ◽  
pp. 9
Author(s):  
Małgorzata E. Zakrzewska ◽  
Ana B. Paninho ◽  
M. Fátima C. Guedes da Silva ◽  
Ana V. M. Nunes
Keyword(s):  
High Pressure ◽  
Ionic Liquid ◽  
Phase Equilibrium ◽  
Process Intensification ◽  
High Pressure Phase ◽  
Equilibrium Studies ◽  
Water Separation ◽  
Alcohol Water ◽  
Product Separation ◽  
Pressure Phase

Selective water (by-product) separation from reaction mixtures stands as an important process intensification strategy for equilibrium-limited reactions. In this work, the possibility of using a high-pressure biphasic reaction media composed of a hydrophobic ionic liquid, 1-hexy-3-methylimidazolium tetracyanoborate, and carbon dioxide was explored for levulinic acid production from 1,4-butanediol. Vapour-liquid equilibrium measurements were performed for the binary (diol+CO2), ternary (diol+CO2+IL), and quaternary systems (diol+CO2+IL+water), at 313.2 K and pressures up to 18 MPa. The static analytical method was used in a high-pressure phase equilibrium apparatus equipped with a visual sapphire cell. The capability of the quaternary system to perform physical water separation is discussed in this paper.

Phase Equilibrium Studies of Lithium Halide-Containing Electrolytes

1969 ◽  
Vol 116 (11) ◽  
pp. 1612 ◽  
Author(s):  
Carl E. Johnson ◽  
Melvin S. Foster
Keyword(s):  
Phase Equilibrium ◽  
Equilibrium Studies

Phase equilibrium studies in the Na-Fe-O system

1993 ◽  
Vol 191 (1) ◽  
pp. 9-13 ◽  
Author(s):  
R. Sridharan ◽  
T. Gnanasekaran ◽  
C.K. Mathews
Keyword(s):  
Phase Equilibrium ◽  
Equilibrium Studies

Phase Equilibrium Studies in Si3N4 — Metal Oxides Systems

1983 ◽  
pp. 89-99 ◽  
Author(s):  
T. Y. Tien ◽  
G. Petzow ◽  
L. J. Gauckler ◽  
J. Weiss
Keyword(s):  
Phase Equilibrium ◽  
Metal Oxides ◽  
Equilibrium Studies

Origin of lunar ultramafic green glasses: constraints from phase equilibrium studies

2000 ◽  
Vol 64 (13) ◽  
pp. 2339-2350 ◽  
Author(s):  
L.T Elkins ◽  
V.A Fernandes ◽  
J.W Delano ◽  
T.L Grove
Keyword(s):  
Phase Equilibrium ◽  
Equilibrium Studies

Phase equilibrium studies in the “MnO”-Al2O3-SiO2 system

2002 ◽  
Vol 33 (6) ◽  
pp. 827-838 ◽  
Author(s):  
Ghasem Roghani ◽  
Evgueni Jak ◽  
Peter Hayes
Keyword(s):  
Phase Equilibrium ◽  
Equilibrium Studies ◽  
Sio2 System
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