Blar i forfatter "Orvik, Alf Andre"

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    • Evolution of the Gállojávri ultramafic intrusion from U-Pb zircon ages and Rb-Sr, Sm-Nd and Lu-Hf isotope systematics 

      Orvik, Alf Andre; Slagstad, Trond; Sørensen, Bjørn Eske; Millar, Ian; Hansen, Harald (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-05)
      The Karasjok–Central Lapland Greenstone Belt is one of the largest Palaeoproterozoic greenstone belts in the Fennoscandian Shield and includes multiple (ultra)mafic intrusions, some with notable ore reserves, formed during three episodes at 2.44, 2.22 and 2.05 Ga. This study presents new mineralogical, geochronological and isotopic data for the Gállojávri ultramafic intrusion, in the Karasjok ...

    • The Palaeoproterozoic Gallujavri Ultramafic Intrusion, Karasjok Greenstone Belt; Petrogenesis of a Trans-Crustal Magma System 

      Orvik, Alf Andre; Slagstad, Trond; Hansen, Harald; Nilsson, Lars Petter; Sørensen, Bjørn Eske (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-14)
      The modern concepts of magmatic plumbing systems have evolved from simple models of melt-dominated crustal magma chambers to magmatic systems that span the continental crust. The geochemistry of these systems is challenging to model numerically because of a complex polybaric and multiphase evolution, which is not well described by mathematic end-member formulas. We propose that a recent modelling ...