Petrology of coronite from the Bergen Arcs Complex,Norway |
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| Authors: | V V Davydova A L Perchuk B Stoeckhert |
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| Institution: | (1) Department of Petrology, Faculty of Geology, Moscow State University, Moscow, 119899, Russia;(2) Institute of Geology of Ore Deposits, Petrology Mineralogy, and Geochemistry (IGEM), RAS, Moscow, Staromonetnyi per. 35, 119017, Russia;(3) Ruhr University, Bochum, D-44780, Germany |
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| Abstract: | Petrologic examination of coronites from the Bergen Arcs Complex in Norway revealed that garnet crowns formed due to clinopyroxene interaction with matrix plagioclase and spinel during the Grenville granulite-facies metamorphism (at T ～ 960°C and P = 1.3 GPa). Along with this, the rocks show evidence of reactions related to superimposed Caledonian eclogite-facies metamorphism. These are microscopic coronas consisting of omphacite, kyanite, corundum, amphibole, and biotite. The rims formed under aqueous conditions with potassium introduction ata T ～ 710–730°C and P ～ 1.3–1.5 GPa. Local occurrence of eclogite metamorphism found at a great distance (>100 m) from shear zones of the eclogite metamorphic stage indicates that the whole eclogite succession and not only its local sites (shear zones) were heated to the eclogite-metamorphism temperature. |
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| Keywords: | Bergen Arcs eclogite granulite corona formation temperature pressure |
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