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dc.contributor.authorCionoiu, S.
dc.contributor.authorMoulas, E.
dc.contributor.authorStunitz, Holger
dc.contributor.authorTajcmanova, L.
dc.date.accessioned2022-09-09T08:56:19Z
dc.date.available2022-09-09T08:56:19Z
dc.date.issued2022-08-17
dc.description.abstractUnderstanding conditions in the Earth's interior requires data derived from laboratory experiments. Such experiments provide important insights into the conditions under which mineral reactions take place as well as processes that control the localization of deformation in the deep Earth. We performed Griggs-type general shear experiments in combination with numerical models, based on continuum mechanics, to quantify the effect of evolving sample geometry of the experimental assembly. The investigated system is constituted by CaCO<sub>3</sub> and the experimental conditions are near the calcite-aragonite phase transition. All experimental samples show a heterogeneous distribution of the two CaCO<sub>3</sub> polymorphs after deformation. This distribution is interpreted to result from local stress variations. These variations are in agreement with the observed phase-transition patterns and grain-size gradients across the experimental sample. The comparison of the mechanical models with the sample provides insights into the distribution of local mechanical parameters during deformation. Our results show that, despite the use of homogeneous sample material (here calcite), stress variations develop due to the experimental geometry. The comparison of experiments and numerical models indicates that aragonite formation is primarily controlled by the spatial distribution of mechanical parameters. Furthermore, we monitor the maximum pressure and σ<sub>1</sub> that is experienced in every part of our model domain for a given amount of time. We document that local pressure (mean stress) values are responsible for the transformation. Therefore, if the role of stress as a thermodynamic potential is investigated in similar experiments, an accurate description of the state of stress is required.en_US
dc.identifier.citationCionoiu, Moulas, Stunitz H, Tajcmanova L. Locally Resolved Stress-State in Samples During Experimental Deformation: Insights Into the Effect of Stress on Mineral Reactions. Journal of Geophysical Research (JGR): Solid Earth. 2022;127(8)en_US
dc.identifier.cristinIDFRIDAID 2047673
dc.identifier.doihttps://doi.org/10.1029/2022JB024814
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.urihttps://hdl.handle.net/10037/26740
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalJournal of Geophysical Research (JGR): Solid Earth
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleLocally Resolved Stress-State in Samples During Experimental Deformation: Insights Into the Effect of Stress on Mineral Reactionsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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