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dc.contributor.authorLee, Amicia
dc.contributor.authorStunitz, Holger
dc.contributor.authorSoret, Mathieu
dc.contributor.authorBattisti, Matheus Ariel
dc.date.accessioned2022-03-23T09:45:21Z
dc.date.available2022-03-23T09:45:21Z
dc.date.issued2022-01-01
dc.description.abstractThe lower crust is, on average, mafic in composition and composed of minerals that remain mechanically strong up to high temperatures. Here we show that dissolution-precipitation creep (as a type of diffusion creep) plays a major role in deformation of gabbro bodies at upper amphibolite facies conditions. The Kågen gabbro, N. Norway, is comprised of undeformed gabbro lenses enclosed by mylonitised margins that deformed at 690 ± 25 °C and 1.0–1.1 GPa. The evolution of the microstructures and fabric of the low strain gabbro to high strain margins were investigated. Original clinopyroxene and plagioclase dissolved during mineral reactions and precipitated as new minerals phases: new plagioclase and clinopyroxene (different compositions relative to the magmatic parents) and additional amphibole and garnet. Microstructural and crystallographic preferred orientation (CPO) data indicate that dissolution-precipitation creep is the dominant deformation mechanism. Amphibole shows a strong CPO that is primarily controlled by orientated growth in the stretching direction. The progression of mineral reactions and weakening is directly connected to a fluid-assisted transformation process that facilitates diffusion creep deformation of strong minerals at far lower stresses and temperatures than required by dislocation creep. Initially strong lithologies can become weak, provided that reactions proceed during deformation.en_US
dc.identifier.citationLee AL, Stunitz H, Soret, Battisti MA. Dissolution precipitation creep as a process for the strain localisation in mafic rocks. Journal of Structural Geology. 2022en_US
dc.identifier.cristinIDFRIDAID 1977483
dc.identifier.doi10.1016/j.jsg.2021.104505
dc.identifier.issn0191-8141
dc.identifier.issn1873-1201
dc.identifier.urihttps://hdl.handle.net/10037/24503
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalJournal of Structural Geology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleDissolution precipitation creep as a process for the strain localisation in mafic rocksen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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