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dc.contributor.author
Tajčmanová, Lucie
dc.contributor.author
Vrijmoed, Johannes
dc.contributor.author
Moulas, Evangelos
dc.date.accessioned
2023-05-31T12:22:06Z
dc.date.available
2017-06-11T17:45:27Z
dc.date.available
2023-05-31T12:22:06Z
dc.date.issued
2015-02
dc.identifier.issn
0024-4937
dc.identifier.other
10.1016/j.lithos.2015.01.006
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/101451
dc.identifier.doi
10.3929/ethz-b-000101451
dc.description.abstract
Recent work on mineral reactions and microstructures in metamorphic rocks has focused on forward modelling of phase equilibria and on their description through chemical potential relationships which control mass transfer in rocks. The available thermodynamic databases and computer programs for phase equilibria modelling have significantly improved the quantification and understanding of geodynamic processes. Therefore, our current methodological framework seems to be satisfactory. However, the quantification approaches in petrology focus on chemical processes with oversimplified mechanics. A review of the recent literature shows that mechanical effects in rocks may result in the development of pressure variations even on a hand specimen or grain scale. Such variations are critical for interpreting microstructural and mineral composition observations in rocks. Mechanical effects may influence element transport and mineral assemblage in rocks. Considering the interplay of mechanical properties and metamorphic reactions is therefore crucial for a correct interpretation of microstructural observations in metamorphic rocks as well as for quantification of processes. In this contribution, arguments against pressure variations are inspected and disproved. The published quantification procedure for systems with grain-scale pressure variations is reviewed. We demonstrate the equivalence of using Gibbs and Helmholtz energy in an isobaric system and go on to suggest that Gibbs free energy is more convenient for systems with pressure variations. Furthermore, we outline the implications of the new quantification approach for phase equilibria modelling as well as diffusion modelling. The appropriate modification of a macroscopic flux for a system with a pressure variation is derived and a consequence of using mass or molar units in diffusional fluxes is discussed. The impact of ignoring grain-scale pressure variations on geodynamic modelling and our understanding of the processes in the Earth’s interior is assessed. We show that if a pressure variation is overlooked, the error in depth estimates from crustal metamorphic rocks could be as large as the thickness of the crust.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Equilibrium thermodynamics
en_US
dc.subject
Lithostatic pressure
en_US
dc.subject
Mechanical equilibrium
en_US
dc.subject
Nonhydrostatic thermodynamics
en_US
dc.subject
Pressure variations
en_US
dc.title
Grain-scale pressure variations in metamorphic rocks: implications for the interpretation of petrographic observations
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2015-01-19
ethz.journal.title
Lithos
ethz.journal.volume
216-217
en_US
ethz.journal.abbreviated
Lithos
ethz.pages.start
338
en_US
ethz.pages.end
351
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Interplay between metamorphism and deformation in the Earth’s lithosphere
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
000050119
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::09503 - Tajcmanová, Lucie (ehemalig) / Tajcmanová, Lucie (former)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::09503 - Tajcmanová, Lucie (ehemalig) / Tajcmanová, Lucie (former)
ethz.grant.agreementno
335577
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
FP7
ethz.date.deposited
2017-06-11T17:45:47Z
ethz.source
ECIT
ethz.identifier.importid
imp593653396e12e65042
ethz.ecitpid
pub:159256
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-15T10:46:28Z
ethz.rosetta.lastUpdated
2024-02-02T23:50:38Z
ethz.rosetta.versionExported
true
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