Applying Phase Equilibria Modelling to Metamorphic and Geological Processes: Recent Developments and Future Potential

Yakymchuk, Chris

doi:10.12789/geocanj.2017.44.114

Cited by 21 publications

(15 citation statements)

References 123 publications

(200 reference statements)

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“…An alternative strategy is to use forward thermodynamic models such as isochemical P–T phase diagrams combined with isopleth thermobarometry (Powell & Holland, 2008). These tools are commonly used to depict the evolution of the stable mineral assemblage, modes and compositions for a given bulk system composition (De Capitani & Petrakakis, 2010; Hensen, 1971; White, Powell, & Baldwin 2008; Yakymchuk, 2017). The numerical strategy reflects the tendency of any rock system to minimize its total Gibbs energy and to converge towards a global state of thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Iterative thermodynamic modelling—Part 2: Tracing equilibrium relationships between minerals in metamorphic rocks

Lanari

Hermann

2021

Journal Metamorphic Geology

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Understanding equilibrium relationships between minerals is a fundamental goal of metamorphic petrology, especially for the quantification of metamorphic conditions recorded by crustal rocks. Information on pressure (P) and temperature (T) can be derived from mineral compositions based on the a priori assumption that frozen-in assemblages reflect chemical equilibrium at the time of formation. While the stable coexistence of minerals is commonly assessed from a combination of microstructural criteria and interpretation of phase diagrams, there is no robust modelling strategy available so far for the unambiguous recognition of minerals that grew at different conditions. This study uses iterative thermodynamic models and the computer program Bingo-Antidote to propose a general strategy for assessing the stable coexistence of minerals and therefore for tracing multiple partial equilibrium relationships preserved in metapelites to reconstruct their P-T evolutions. First the principles of Highlights• Application of iterative thermodynamic models to metapelite.• Identification of prograde, peak and retrograde minerals.• Post-growth diffusion can affect garnet thermobarometry.• Partial re-equilibration during peak metamorphism.

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Section: Introductionmentioning

confidence: 99%

Iterative thermodynamic modelling—Part 2: Tracing equilibrium relationships between minerals in metamorphic rocks

Lanari

Hermann

2021

Journal Metamorphic Geology

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“…Thermodynamic calculations have become a powerful tool to study several aspects of igneous and metamorphic rocks, not only the P–T conditions at which a mineral assemblage equilibrated but also the fertility of crustal sources, open system behaviour and melt drainage during partial melting, alteration vectors in hydrothermally altered rocks, deformation and tectonics, and many more topics (e.g. Yakymchuk, 2017). A particular set of calculations are the isochemical phase diagrams (pseudosections), used with the advent of internally consistent thermodynamic databases.…”

Section: Introductionmentioning

confidence: 99%

Consistency of the activity–composition models of Holland, Green, and Powell (2018) with experiments on natural and synthetic compositions: A comparative study

García‐Arias

2020

Journal Metamorphic Geology

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The recent publication of new activity-composition models by Holland, Green and Powell (2018; Journal of Petrology 59: 881-900), with a melt model calibrated for source compositions ranging from peridotitic to granitic, opens the door to the modelling of multiple petrogenetic processes at supersolidus conditions in which the composition of the melt phase changes considerably, without having to change the melt model. This melt model is also the first one using the internally consistent thermodynamic databases published by T. Holland and R. Powell that contains TiO 2 and Fe 2 O 3 , further expanding the application of this model to more realistic geological scenarios. The accompanying mineral models are also the first in containing some minor elements, like TiO 2 in garnet and K 2 O in clinopyroxene. Consequently, it is relevant to test the applicability of these new models to a large P-T-X range of conditions before they can be used in full. Thermodynamic calculations made with the software Perple_X using these models were compared to experimental results, namely the modal proportions and the composition of the melt and several mineral solution phases. The experiments chosen for the comparative study covered a wide range of source compositions (from mafic to felsic), pressure (from 0.3 to 2.1 GPa), temperature (from 700 to 1,150°C) and total and added water content (structural water: 0.15-1.48 wt%; added water: 0-8 wt%; total water: 0.15%-8.15%). The results indicate that the extended melt model reproduces well the composition of the experimental melts, with an inverse correlation between component amount and fit: the best match is found for SiO 2 (−0.8% on average) and the worst match is found for those elements with the lowest amounts, TiO 2 and MgO (+241% and +235% on average, respectively; values indicate calculated minus experimental, times 100 and divided by experimental). The TiO 2 content in the melt model increases dramatically with increasing pressure, from +90% for P < 1.5 GPa to +593% for P > 1.5 GPa. No comparison was made on the Fe 2 O 3 content, as the published iron contents of the experimental melts were always reported as FeO t. In some cases, there is a substantial mismatch in the modal proportions between experiments and calculations, with the reactant phases less abundant and product phases more abundant in the calculations, an effect that is attributed to kinetic effects in the experiments and to the selected clinoamphibole model. Finally, the extended melt model was compared 994 | GARCÍA-ARIAS 1 | INTRODUCTION Thermodynamic calculations have become a powerful tool to study several aspects of igneous and metamorphic rocks, not only the P-T conditions at which a mineral assemblage equilibrated but also the fertility of crustal sources, open system behaviour and melt drainage during partial melting, alteration vectors in hydrothermally altered rocks, deformation and tectonics, and many more topics (e.g. Yakymchuk, 2017). A particular set of calculations are the isochemical phase diagrams (pseud...

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“…The first computational approach is to use Gibbs free energy minimization to determine the stable phase assemblages ata given P-T condition. The common software packages available for this approach are Perple_X [23].…”

Section: )mentioning

confidence: 99%

Petrological Characteristic and Whole Rock Geochemistry of Metamorphic Rocks in Melangè Complex of Ciletuh Area, West Java, Indonesia

Ikhram

Syafri

Rosana

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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Melangè Complex of Ciletuh Area, West Java, Indonesia is located at 106 ° 23 '38.9 "-106 ° 25' 27.6" E and 7 ° 14 '27.6 "-7 ° 12' 46.2" S. This area has unique geological features where the Early Cenozoic uplifted subduction rocks such as ophiolites and metamorphic rocks are exposed. This study aimed to determine the condition of the stratigraphic position and geological structure of metamorphic rock unit in the field, to find out the metamorphic facies and their evolution, to know the parental rocks (protoliths) of metamorphic rocks, and to interpret tectonic environments for the formation of metamorphic rocks based on stratigraphy, geological structure, petrography, and geochemistry. Study of literatures, geological mapping, petrology and geochemical analyses were used as methods of this research. The entire analysis is combined as a guidance in interpretation of petro-tectonic environment. Distribution of metamorphic rock outcrops found in several places, such as, Citisuk River, Cikopo River and Cikarikil River. Based on petrography analysis, metamorphic rocks types consist of schistose amphibolite, various type of greenschist, phyllite and quartzite. The protolith of metamorphic rocks in Ciletuh is quite diverse, namely metasediments such as pelitic, psammitic, calc-silicate sediment, and meta-igneous such as gabbro and basalt. The presence of epidote, chlorite, and calcite in schistose amphibolite show retrograde metamorphism process in lower temperature-pressures condition. The occurance of quartz and calcite vein in several samples was shown as an indication of hydrothermal alteration. Based on geochemical characteristics, the result showed that sedimentary source of metasedimentary rocks were derived from the volcanic arc environment. While, metabasalt rocks were originated from the Island Arc tectonic environment. According to the association, these metamorphic rocks were formed by regional metamorphism, as the result of subduction process and orogenic event. Thus, retrograde metamorphism indicates the lifting or accretion process that caused by subsecuent tectonic activity.

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Applying Phase Equilibria Modelling to Metamorphic and Geological Processes: Recent Developments and Future Potential

Cited by 21 publications

References 123 publications

Iterative thermodynamic modelling—Part 2: Tracing equilibrium relationships between minerals in metamorphic rocks

Iterative thermodynamic modelling—Part 2: Tracing equilibrium relationships between minerals in metamorphic rocks

Consistency of the activity–composition models of Holland, Green, and Powell (2018) with experiments on natural and synthetic compositions: A comparative study

Petrological Characteristic and Whole Rock Geochemistry of Metamorphic Rocks in Melangè Complex of Ciletuh Area, West Java, Indonesia

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