Mineral equilibria modelling for earth processes
Grant number: DP0451770
The aim of the project is to develop methodologies, and to generate an internally-consistent set of thermodynamic descriptions of minerals, in multicomponent systems, so that reliable mineral equilibria modelling can be undertaken in the majority of systems of geological interest. Such mineral equilibria modelling will allow the testing of hypotheses regarding Earth processes, for example in relation to mountain building, granite magmatism, and the generation of gold deposits.
Related publications (39)
Using calculated chemical potential relationships to account for replacement of kyanite by symplectite in high pressure granulites
JA Baldwin, R Powell, RW White, P Stipska
Calculated mineral equilibria are used to account for the formation of sapphirine-plagioclase, spinel-plagioclase and corundum-pla..
Garnet and spinel lherzolite assemblages in MgO-Al2O3-SiO2 and CaO-MgO-Al2O3-SiO2: thermodynamic models and an experimental conflict
ECR Green, TJB Holland, R Powell, RW White
The recent publication of an updated thermodynamic dataset for petrological calculations provides an opportunity to illustrate the..
Stability of sapphirine plus quartz in the oxidized rocks of the Wilson Lake terrane, Labrador: calculated equilibria in NCKFMASHTO
FJ Korhonen, R Powell, JH Stout
The equilibrium coexistence of sapphirine+quartz is inferred to record temperatures in excess of 980°C, based on the stability of ..
An improved and extended internally consistent thermodynamic dataset for phases of petrological interest, involving a new equation of state for solids
TJB Holland, R Powell
The thermodynamic properties of 254 end-members, including 210 mineral end-members, 18 silicate liquid end-members and 26 aqueous ..
Progress in linking accessory mineral growth and breakdown to major mineral evolution in metamorphic rocks: a thermodynamic approach in the Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-ZrO2 system
DE Kelsey, R Powell
Activity-composition (a-x) models have been generated for zirconium-bearing haplogranitic silicate melt and garnet from experiment..
Calculated phase equilibria for a morb composition in a P-T range, 450-650 degrees C and 18-28 kbar: the stability of eclogite
G Rebay, R Powell, JFA Diener
Lower temperature eclogite (with T = 600 °C) represents a significant part of the occurrences of eclogite in orogenic belts. 'True..
Using calculated chemical potential relationships to account for coronas around kyanite: an example from the Bohemian Massif
P Stipska, R Powell, RW White, JA Baldwin
Corona textures around kyanite, involving for example zoned plagioclase separating kyanite from the matrix, reflect the instabilit..
Contrasting metamorphic histories of lenses of high-pressure rocks and host migmatites with a flat orogenic fabric (Bohemian Massif, Czech Republic): a result of tectonic mixing within horizontal crustal flow?
P Stipska, K Schulmann, R Powell
Migmatites with sub-horizontal fabrics at the eastern margin of the Variscan orogenic root in the Bohemian Massif host lenses of e..
Garnet-clinopyroxene intermediate granulites in the St. Leonhard massif of the Bohemian Massif: ultrahigh-temperature metamorphism at high pressure or not?
M Racek, P Stipska, R Powell
Garnet-clinopyroxene intermediate granulites occur as thin layers within garnet-kyanite-K-feldspar felsic granulites of the St. Le..
Formation of eclogite, and reaction during exhumation to mid-crustal levels, Snowbird tectonic zone, western Canadian Shield
JA Baldwin, R Powell, ML Williams, P Goncalves
A re-evaluation of the P-T history of eclogite within the East Athabasca granulite terrane of the Snowbird tectonic zone, northern..
A method for activity calculations in saline and mixed solvent solutions at elevated temperature and pressure: A framework for geological phase equilibria calculations
Katy Evans, Roger Powell
Quantitative thermodynamic calculations that involve aqueous fluids have proved difficult because of the complexity of the interac..
A thermodynamic model for Ca-Na clinoamphiboles in Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O-O for petrological calculations
J Dale, R Powell, RW White, FL Elmer, TJB Holland
A calibration is presented for an activity-composition model for amphiboles in the system Na2O-CaO-FeO-MgO-Al2 O3-SiO2-H2O-O (NCFM..
Modelling of mineral equilibria in ultrahigh-temperature metamorphic rocks from the Anapolis-Itaucu Complex, central Brazil
JA Baldwin, R Powell, M Brown, R Moraes, RA Fuck
A new quantitative approach to constraining mineral equilibria in sapphirine-bearing ultrahigh-temperature (UHT) granulites throug..