Browsing Institutt for geofag by Author "Jamtveit, Bjørn"

Now showing items 21-36 of 36

  • Molecular dynamics study of confined water in the periclase-brucite system under conditions of reaction-induced fracturing 
    Guren, Marthe Grønlie; Sveinsson, Henrik Andersen; Hafreager, Anders; Jamtveit, Bjørn; Malthe-Sørenssen, Anders; Renard, Francois (Journal article / Tidsskriftartikkel, 2021)
    The volume-increase associated with hydration reactions in rocks may lead to reaction-induced fracturing, but requires a stable water film to be present at reactive grain boundaries even when subject to compressive stress. ...
  • Nanoscale earthquake records preserved in plagioclase microfractures from the lower continental crust 
    Petley-Ragan, Arianne Juliette; Plümper, Oliver; Ildefonse, Benoit; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Seismic faulting causes wall rock damage, which is driven by both mechanical and thermal stress. In the lower crust, co-seismic damage increases wall rock permeability, permits fluid infiltration and triggers metamorphic ...
  • 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 ...
  • Ophicarbonates of the Feragen Ultramafic Body, central Norway 
    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 ...
  • Pore-scale controls on reaction-driven fracturing 
    Røyne, Anja; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
  • A Precambrian microcontinent in the Indian Ocean 
    Torsvik, Trond Helge; Amundsen, Hans; Hartz, Ebbe Hvidegård; Corfu, Fernando; Kusznir, Nick; Gaina, Carmen; Dubrovin, Pavel; Steinberger, Bernard; Ashwal, Lewis D.; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2013)
    The Laccadive–Chagos Ridge and Southern Mascarene Plateau in the north-central and western Indian Ocean, respectively, are thought to be volcanic chains formed above the Réunion mantle plume1 over the past 65.5 million ...
  • Pristine microstructures in pseudotachylytes formed in dry lower crust, Lofoten, Norway 
    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 ...
  • Protracted localization of metamorphism and deformation in a heterogeneous lower-crustal shear zone 
    Zertani, Sascha; Menegon, Luca; Pennacchioni, Giorgio; Buisman, Iris; Corfu, Fernando; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Deformation of the continental crust is influenced by the pre-existing structural framework, fluid availability, strain rate, and pressure-temperature conditions. We investigate the evolution of a large (hundreds-of-meters ...
  • Reaction-induced embrittlement of the lower continental crust 
    Incel, Sarah; Labrousse, Loic; Hilairet, Nadège; John, Timm; Gasc, Julien; Shi, Feng; Wang, Yanbin; Andersen, Torgeir Bjørge; Renard, Francois; Jamtveit, Bjørn; Schubnel, Alexandre (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Field observations and geophysical data reveal a causal link between brittle seismic failure and eclogitization of the lower continental crust. We present results from experimental deformation of plagioclase-rich samples ...
  • Reservoir properties and reactivity of the Faroe Islands Basalt Group: Investigating the potential for CO2 storage in the North Atlantic Igneous Province 
    Rosenqvist, Marija Plahter; Meakins, Max W.J.; Planke, Sverre; Millett, John M.; Kjøll, Hans Jørgen; Voigt, Martin J.; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Offshore injection of CO2 into volcanic sequences of the North Atlantic Igneous Province may present a large-scale, permanent storage option through carbonate mineralization. To investigate this potential, onshore studies ...
  • Seismic faults triggered early stage serpentinization of peridotites from the Samail Ophiolite, Oman 
    Aupart, Claire Olga Maryse; Morales, Luiz F.G.; Godard, Marguerite; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Serpentinization of mantle peridotites has first order effects on the rheology and tectonic behavior of the oceanic lithosphere, on the global water cycle, and on the biosphere at mid-oceanic ridges. Investigating ...
  • Spatial and size distributions of garnets grown in a pseudotachylyte generated during a lower crust earthquake 
    Clerc, Adriane; Renard, Francois; Austrheim, Håkon Olaf; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    In the Bergen Arc, western Norway, rocks exhumed from the lower crust record earthquakes that formed during the Caledonian collision. These earthquakes occurred at about 30–50 km depth under granulite or amphibolite facies ...
  • Subarctic physicochemical weathering of serpentinized peridotite 
    Ulven, Ole Ivar; Beinlich, Andreas; Hövelmann, Jörn-Erik; Austrheim, Håkon Olav; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Frost weathering is effective in arctic and subarctic climate zones where chemical reactions are limited by the reduced availability of liquid water and the prevailing low temperature. However, small scale mineral dissolution ...
  • The effects of earthquakes and fluids on the metamorphism of the lower continental crust 
    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 ...
  • 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. ...
  • Zircon and quartz inclusions in garnet used for complementary Raman thermobarometry: application to the Holsnøy eclogite, Bergen Arcs, Western Norway 
    Zhong, Xin; Andersen, Niels Højmark; Dabrowski, Marcin; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Mineral inclusions are common and have been widely used to investigate complex geological history. When a rock undergoes cooling and decompression after the entrapment of an inclusion into a host mineral, residual pressure ...