Browsing Institutt for geofag by Author "Dunkel, Kristina G"
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Austrheim, Håkon Olaf; Dunkel, Kristina G; Plümper, Oliver; Ildefonse, Benoit; Liu, Yang; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)Fractures and faults riddle the Earth’s crust on all scales, and the deformation associated with them is presumed to have had significant effects on its petrological and structural evolution. However, despite the abundance ...
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Dunkel, Kristina G; Zhong, Xin; Arnestad, Paal Ferdinand; Valen, Lars Vesterager; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)Seismic activity below the standard seismogenic zone is difficult to investigate because the geological records of such earthquakes, pseudotachylytes, are typically reacted and/or deformed. Here, we describe unusually ...
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Dunkel, Kristina G; Austrheim, Håkon Olav; Renard, Francois; Cordonnier, Benoit; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)Dehydration of partly or completely serpentinized ultramafic rocks can increase the pore fluid pressure and induce brittle failure, a process referred to as dehydration embrittlement. However the extents of strain localization ...
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Austrheim, Håkon Olaf; Engvik, Ane; Ganerød, Morgan; Dunkel, Kristina G; Velo, Mari Roen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)The Kongsberg and Bamble lithotectonic domains of SE-Norway are known as classical Precambrian high-grade metamorphic terrains. The area has undergone extensive metasomatism with formation of albitites and scapolite-rich ...
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Petley-Ragan, Arianne Juliette; Dunkel, Kristina G; Austrheim, Håkon Olaf; Ildefonse, Benoit; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)Coseismic damage associated with earthquakes in the lower continental crust is accompanied by postseismic annealing and fluid‐mediated metamorphism that influence the physical and chemical development of the continental ...
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Olivine Grain Size Distributions in Faults and Shear Zones: Evidence for Nonsteady State Deformation Aupart, Claire Olga Maryse; Dunkel, Kristina G; Angheluta, Luiza; Austrheim, Håkon Olaf; Ildefonse, Beniot; Malthe-Sørenssen, Anders; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)The grain size distribution of deformed rocks may provide valuable information about their deformation history and the associated mechanisms. Here we present a unique set of olivine grain size distributions from ultramafic ...
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Dunkel, Kristina G; Jamtveit, Bjørn; Austrheim, Håkon Olaf (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)The carbonation of ultramafic rocks is a common alteration process in ophiolites and can occur in various settings. We provide the first detailed description of the carbonated peridotites (ophicarbonates) of the Feragen ...
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Dunkel, Kristina G; Morales, Luiz F.G.; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Feldspar-rich pseudotachylytes from the island of Moskenesøya, Lofoten, formed in dry granulites under lower crustal conditions during the Caledonian orogeny. The central parts of the pseudotachylytes, where the cooling ...
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Jamtveit, Bjørn; Petley-Ragan, Arianne Juliette; Incel, Sarah; Dunkel, Kristina G; Aupart, Claire Olga Maryse; Austrheim, Håkon; Corfu, Fernando; Menegon, Luca; Renard, Francois (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)Rock rheology and density have first‐order effects on the lithosphere's response to plate tectonic forces at plate boundaries. Changes in these rock properties are controlled by metamorphic transformation processes that ...
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Transfer of olivine crystallographic orientation through a cycle of serpentinisation and dehydration Dunkel, Kristina G; Austrheim, Håkon Olaf; Ildefonse, Benoit; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)Our ability to decipher the mechanisms behind metamorphic transformation processes depends in a major way on the extent to which crystallographic and microstructural information is transferred from one stage to another. ...