Browsing Institutt for geofag by Author "Jamtveit, Bjørn"

Now showing items 1-20 of 36

  • Analytical solution for residual stress and strain preserved in anisotropic inclusion entrapped in an isotropic host 
    Zhong, Xin; Dabrowski, Marcin; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Raman elastic thermobarometry has recently been applied in many petrological studies to recover the pressure and temperature (P–T) conditions of mineral inclusion entrapment. Existing modelling methods in petrology either ...
  • Analytical solution for the stress field in elastic half-space with a spherical pressurized cavity or inclusion containing eigenstrain 
    Zhong, Xin; Dabrowski, Marcin; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We present an analytical solution based on the series expansion of Papkovich-Boussinesq's displacement potentials to derive the elastic solution of a spherical inclusion containing an eigenstrain or pressurized cavity in ...
  • Disequilibrium metamorphism of stressed lithosphere 
    Jamtveit, Bjørn; Austrheim, Håkon Olav; Putnis, Andrew (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2016)
    Most changes in mineralogy, density, and rheology of the Earth's lithosphere take place by metamorphism, whereby rocks evolve through interactions between minerals and fluids. These changes are coupled with geodynamic ...
  • Dynamic earthquake rupture in the lower crust 
    Petley-Ragan, Arianne Juliette; Ben-Zion, Yehuda; Austrheim, Håkon Olaf; Ildefonse, Benoit; Renard, Francois; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Earthquakes in the continental crust commonly occur in the upper 15 to 20 km. Recent studies demonstrate that earthquakes also occur in the lower crust of collision zones and play a key role in metamorphic processes that ...
  • Dynamic pressure variations in the lower crust caused by localized fluid-induced weakening 
    Moulas, Evangelos; Kaus, Boris; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Metamorphism of dry, lower crust within orogens is often localized in shear zones composed of mechanically weaker rocks 1–4 . Several field-based studies suggest shear zone development is preceded by brittle faults ...
  • Earthquake-induced transformation of the lower crust 
    Jamtveit, Bjørn; Ben-Zion, Yehuda; Renard, Francois; Austrheim, Håkon Olaf (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    The structural and metamorphic evolution of the lower crust has direct effects on the lithospheric response to plate tectonic processes involved in orogeny, including subsidence of sedimentary basins, stability of deep ...
  • Effects of Confinement on Reaction-Induced Fracturing During Hydration of Periclase 
    Zheng, Xiaojiao; Cordonnier, Benoit; Zhu, Wenlu; Renard, Francois; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Hydration of a nominally dry rock can cause expansion of the solid volume, resulting in reaction‐induced fracturing and an associated increase in the porosity and permeability of the rock. We study the effect of confinement ...
  • Evolution of Brittle Structures in Plagioclase-Rich Rocks at High-Pressure and High-Temperature Conditions - Linking Laboratory Results to Field Observations 
    Incel, Sarah; Renner, Jörg; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Plagioclase‐rich granulites exposed on the Lofoten archipelago, Northern Norway, display strain localization in pseudotachylytes as well as ductile shear zones that formed under similar high‐pressure and high‐temperature ...
  • Experimental evidence for wall-rock pulverization during dynamic rupture at ultra-high pressure conditions 
    Incel, Sarah; Schubnel, Alexandre; Renner, Jörg; John, Timm; Labrousse, Loic; Hilairet, Nadège; Freeman, Helen; Wang, Yanbin; Renard, Francois; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    The mechanisms triggering intermediate and deep earthquakes have puzzled geologists for several decades. There is still no consensus concerning whether such earthquakes are triggered by brittle or ductile mechanisms. We ...
  • First principles model of carbonate compaction creep 
    Keszthelyi, Dániel; Dysthe, Dag Kristian; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Rocks under compressional stress conditions are subject to long‐term creep deformation. From first principles we develop a simple micromechanical model of creep in rocks under compressional stress that combines microscopic ...
  • Fluid-driven metamorphism of the continental crust governed by nanoscale fluid flow 
    Plümper, Oliver; Botan, Alexandru; Los, Catharina; Liu, Yang; Malthe-Sørenssen, Anders; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    The transport of fluids through the Earth’s crust controls the redistribution of elements to form mineral and hydrocarbon deposits, the release and sequestration of greenhouse gases, and facilitates metamorphic reactions ...
  • Fragmentation of wall rock garnets during deep crustal earthquakes 
    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 ...
  • Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman 
    Aiken, John Mark; Sohn, Robert A.; Renard, Francois; Matter, Juerg; Kelemen, Peter; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Serpentinization and carbonation of mantle rocks (peridotite alteration) are fundamentally important processes for a spectrum of geoscience topics, including arc volcanism, earthquake processes, chemosynthetic biological ...
  • High Pressure Metamorphism Caused by Fluid Induced Weakening of Deep ontinental Crust 
    Jamtveit, Bjørn; Moulas, Evangelos; Andersen, Torgeir Bjørge; Austrheim, Håkon Olaf; Corfu, Fernando; Petley-Ragan, Arianne Juliette; Schmalholz, Stefan Markus (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Studies of mineral equilibria in metamorphic rocks have given valuable insights into the tectonic processes operating at convergent plate margins during an orogeny. Geodynamic models simulating orogenesis and crustal ...
  • High transient stress in the lower crust: Evidence from dry pseudotachylytes in granulites, Lofoten Archipelago, northern Norway 
    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 ...
  • Hydrodynamic shadowing effect during precipitation of dendrites in channel flow 
    Hawkins, Christopher; Angheluta, Luiza; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    A supersaturated fluid flowing over a reactive, rough surface leads to complex precipitation patterns. We study the growth and interaction between discrete precipitates along a reactive wall in a nonlaminar channel flow. ...
  • Localized slip controlled by dehydration embrittlement of partly serpentinized dunites, Leka Ophiolite Complex, Norway 
    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 ...
  • Lower crustal earthquake associated with highly pressurized frictional melts 
    Zhong, Xin; Petley-Ragan, Arianne Juliette; Incel, Sarah; Dabrowski, Marcin; Andersen, Niels Højmark; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract Earthquakes at lower crustal depths are common during continental collision. However, the coseismic weakening mechanisms required to propagate an earthquake at high pressures are poorly understood. Transient ...
  • Microstructural Records of Earthquakes in the Lower Crust and Associated Fluid-Driven Metamorphism in Plagioclase-Rich Granulites 
    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 ...
  • Mixed‐mode strain localization generated by hydration reaction at crustal conditions 
    Zheng, Xiaojiao; Cordonnier, Benoit; McBeck, Jessica Ann; Boller, Elodie; Jamtveit, Bjørn; Zhu, Wenlu; Renard, Francois (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Hydration reactions influence rock density and rheology. For example, volume increases produced in hydration reactions may generate sufficient tensile and shear stress to fracture both the rock undergoing the reaction and ...