THERMODYNAMIC MODELLING OF MAFIC GRANULITES: DISCREPANCIES BETWEEN OBSERVED AND PREDICTED PHASE EQUILIBRIA

2018 ◽  
Author(s):  
Jacob B. Forshaw ◽  
◽  
David J. Waters ◽  
David R.M. Pattison ◽  
Richard M. Palin ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Thermodynamic Modelling

On the constitution and thermodynamic modelling of the system Ti–Ni–Sn

RSC Advances ◽  
2015 ◽  
Vol 5 (112) ◽  
pp. 92270-92291 ◽  
Author(s):  
M. Gürth ◽  
A. Grytsiv ◽  
J. Vrestal ◽  
V. V. Romaka ◽  
G. Giester ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Thermodynamic Modelling ◽  
Calculated Phase

Experimental and calculated phase equilibria for the system Ti–Ni–Sn.

PHASE EQUILIBRIA, THERMODYNAMIC MODELLING AND NEUTRON DIFFRACTION OF THE AlN-Al2O3-Y2O3 SYSTEM

2003 ◽  
Vol 42 (4) ◽  
pp. 495-507 ◽  
Author(s):  
M. MEDRAJ ◽  
R. HAMMOND ◽  
W.T. THOMPSON ◽  
R.A.L. DREW
Keyword(s):  
Neutron Diffraction ◽  
Phase Equilibria ◽  
Thermodynamic Modelling

scholarly journals Using the elastic properties of zircon-garnet host-inclusion pairs for thermobarometry of the ultrahigh-pressure Dora-Maira whiteschists: problems and perspectives

2021 ◽  
Vol 176 (5) ◽  
Author(s):  
Nicola Campomenosi ◽  
Marco Scambelluri ◽  
Ross J. Angel ◽  
Joerg Hermann ◽  
Mattia L. Mazzucchelli ◽  
...  
Keyword(s):  
Phase Equilibria ◽  
Western Alps ◽  
Thermodynamic Modelling ◽  
The Other ◽  
Ultrahigh Pressure ◽  
Garnet Growth ◽  
Threshold Temperature ◽  
Other Hand ◽  
Chemical Equilibration ◽  
Zr In Rutile

AbstractThe ultrahigh-pressure (UHP) whiteschists of the Brossasco-Isasca unit (Dora-Maira Massif, Western Alps) provide a natural laboratory in which to compare results from classical pressure (P)–temperature (T) determinations through thermodynamic modelling with the emerging field of elastic thermobarometry. Phase equilibria and chemical composition of three garnet megablasts coupled with Zr-in-rutile thermometry of inclusions constrain garnet growth within a narrow P–T range at 3–3.5 GPa and 675–720 °C. On the other hand, the zircon-in-garnet host-inclusion system combined with Zr-in-rutile thermometry would suggest inclusion entrapment conditions below 1.5 GPa and 650 °C that are inconsistent with the thermodynamic modelling and the occurrence of coesite as inclusion in the garnet rims. The observed distribution of inclusion pressures cannot be explained by either zircon metamictization, or by the presence of fluids in the inclusions. Comparison of the measured inclusion strains with numerical simulations shows that post-entrapment plastic relaxation of garnet from metamorphic peak conditions down to 0.5 GPa and 600–650 °C, on the retrograde path, best explains the measured inclusion pressures and their disagreement with the results of phase equilibria modelling. This study suggests that the zircon-garnet couple is more reliable at relatively low temperatures (< 600 °C), where entrapment conditions are well preserved but chemical equilibration might be sluggish. On the other hand, thermodynamic modelling appears to be better suited for higher temperatures where rock-scale equilibrium can be achieved more easily but the local plasticity of the host-inclusion system might prevent the preservation of the signal of peak metamorphic conditions in the stress state of inclusions. Currently, we cannot define a precise threshold temperature for resetting of inclusion pressures. However, the application of both chemical and elastic thermobarometry allows a more detailed interpretation of metamorphic P–T paths.

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