Blar i forfatter "Forien, Melanie"

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    • 1.80–1.75 Ga granite suites in the west Troms Basement Complex, northern Norway: Palaeoproterozoic magma emplacement during advancing accretionary orogeny, from field observations 

      Bergh, Steffen Gunnar; Haaland, Linda Cecilia; Arbaret, L.; Coint, Nolwenn; Forien, Melanie (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-25)
      The Ersfjord Granite is part of a suite of c.1.80–1.75 Ga syeno-granites in the West Troms Basement Complex, northern Norway, presumed to belong to the Transscandinavian Igneous Belt (TIB-1) in the Fennoscandian Shield. Previous data suggest the granite formed post-collisional and ascended as a batholith pluton from a source generated by delamination of mafic-intermediate lower crust. We argue that ...

    • Conduit processes during the February 11, 2010 Vulcanian eruption of Soufriere Hills, Montserrat 

      Burgisser, Alain; Bechon, Tonin; Chevalier, Laure; Collombet, Marielle; Arbaret, Laurent; Forien, Melanie (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-29)
      We analyzed pumice from the February 11, 2010 Vulcanian explosion that immediately followed a large dome collapse at Soufrière Hills volcano. We obtained pre-explosive values of porosity, pressure, and depth by combining textural analyses and glass water content determinations. Our data suggest that the February 2010 explosion evacuated the upper 3 km of the conduit from the dense magma (≤10 vol% ...

    • Petrogenesis of zoned and unzoned mafic pegmatites: An insight from the Palaeoproterozoic mafic-ultramafic Hamn intrusion, Northern Norway 

      Heckmann, Paul; Strmic Palinkas, Sabina; Hansen, Harald; Iacono Marziano, Giada; Rajic, Kristijan; Forien, Melanie; Bergh, Steffen Gunnar (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-03)
      Mafic pegmatites have been reported from various geological environments, including ophiolites, layered magmatic intrusions, and volcanic arcs, but their petrogenesis stayed poorly constrained. This study brings new mineralogical and geochemical data obtained from unzoned and zoned gabbroic pegmatites hosted by the 1.8 Ga mafic-ultramafic Hamn intrusion, Northern Norway, with an aim to improve our ...

    • The role of oxides in the shallow vesiculation of ascending magmas 

      Burgisser, Alain; Arbaret, Laurent; Martel, Caroline; Forien, Melanie; Colombier, Mathieu (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-01)
      Despite their generally low volume fraction, Fesingle bondTi oxides have the potential to greatly influence the eruptive style because they lower the supersaturation pressure for heterogeneous bubble nucleation. Once nucleated, bubbles respond fast to pressure changes, fostering rapid expansion and explosive behavior. Yet, oxide microlite quantifications are often absent from data of explosive ...