Finn forfatter "Trønnes, Reidar G"

Viser treff 1-10 av 10

  • Ab Initio Atomistic Simulations of Ca-Perovskite Melting 
    Hernandez, Jean-Alexis; Mohn, Chris Erik; Guren, Marthe Grønlie; Baron, Marzena Anna; Trønnes, Reidar G (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Melting curves of Ca-perovskite (pure CaSiO3) were determined by ab initio density functional theory, using two solid-liquid coexistence methods and two free energy approaches, in the form of thermodynamic integration and ...
  • Core formation, mantle differentiation and core-mantle interaction within Earth and the terrestrial planets. 
    Trønnes, Reidar G; Baron, Marzena Anna; Eigenmann, Katarina R.; Guren, Marthe Grønlie; Heyn, Björn Holger; Løken, Andreas; Mohn, Chris Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
  • Core-mantle boundary topography and its relation to the viscosity structure of the lowermost mantle 
    Heyn, Björn Holger; Conrad, Clinton Phillips; Trønnes, Reidar G (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Two large areas of anomalously low seismic velocities are visible in all tomographic models of the lowermost mantle. Depending on the density structure of these Large Low Shear Velocity Provinces (LLSVPs), the core-mantle ...
  • Crustal structure and origin of the Eggvin Bank west of Jan Mayen, NE Atlantic 
    Tan, Pingchuan; Breivik, Asbjørn Johan; Trønnes, Reidar G; Mjelde, Rolf; Azuma, Ryosuke; Eide, Sigurd (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    The Eggvin Bank, located between the Jan Mayen Island and Greenland, is an unusually shallow area containing several submarine volcanic peaks, confined by two transforms on the Northern Kolbeinsey Ridge (NKR). We represent ...
  • Donwilhelmsite, [CaAl4Si2O11], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments 
    Fritz, Jörg; Greshake, Ansgar; Klementova, Mariana; Wirth, Richard; Palatinus, Lukas; Trønnes, Reidar G; Assis Fernandes, Vera; Böttger, Ute; Ferrière, Ludovic (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Abstract We report on the occurrence of a new high-pressure Ca-Al-silicate in localized shock melt pockets found in the feldspatic lunar meteorite Oued Awlitis 001 and discuss the implications of our discovery. ...
  • Earth evolution and dynamics—a tribute to Kevin Burke 
    Torsvik, Trond Helge; Steinberger, Bernhard; Ashwal, Lewis D.; Doubrovine, Pavel; Trønnes, Reidar G (Journal article / Tidsskriftartikkel / SubmittedVersion, 2016)
    Kevin Burke’s original and thought-provoking contributions have been published steadily for the past 60 years, and more than a decade ago he set out to resolve how plate tectonics and mantle plumes interact by proposing a ...
  • Experimental constraints on melting temperatures in the MgO–SiO2 system at lower mantle pressures 
    Baron, Marzena Anna; Lord, Oliver T.; Myhill, Robert; Thomson, Andrew R.; Wang, Weiwei; Trønnes, Reidar G; Walter, Michael J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Eutectic melting curves in the system MgO–SiO2 have been experimentally determined at lower mantle pressures using laser-heated diamond anvil cell (LH-DAC) techniques. We investigated eutectic melting of bridgmanite plus ...
  • High pressure silica phase transitions: Implications for deep mantle dynamics and silica crystallization in the protocore. Am. Mineral. 105, 1014-1020. 
    Das, Pratik Kumar; Mohn, Chris Erik; Brodholt, John Peter; Trønnes, Reidar G (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Abstract The subsolidus phase diagram of silica in the 80–220 GPa pressure range was determined by density functional theory (DFT). The transition pressures calculated using the generalized gradient approximation ...
  • Seismological expression of the iron spin crossover in ferropericlase in the Earth’s lower mantle 
    Shephard, Grace; Houser, Christine; Hernlund, John W; Valencia-Cardona, Juan J.; Trønnes, Reidar G; Wentzcovitch, RM (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract The two most abundant minerals in the Earth’s lower mantle are bridgmanite and ferropericlase. The bulk modulus of ferropericlase (Fp) softens as iron d-electrons transition from a high-spin to low-spin state, ...
  • Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History 
    Karlsen, Krister Stræte; Conrad, Clinton Phillips; Domeier, Mathew; Trønnes, Reidar G (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Earth's heat budget is strongly influenced by spatial and temporal variations in surface heat flow caused by plate tectonic cycles. Here, we use a novel set of paleo‐seafloor age grids extending back to the mid‐Paleozoic ...