Early Silurian mafic-ultramafic and granitic plutonism in contemporaneous flysch, Magerøy, northern Norway: U-Pb ages and regional significance

Journal of the Geological Society | March 1, 2006| | Copyright

Abstract:

The Caledonian Mageray sequence comprises Earliest Silurian clastic metasedimentary rocks, which underwent folding and regional metamorphism and were intruded by a mafic-ultramafic complex and various granitic plutons. U-Pb ages of 438.2 ± 0.7 Ma for gabbro in the Honningsvåg Igneous Complex, 438.4 ± 0.9 Ma for an associated granite and 437.7 ± 1.6 Ma for the Finnvik granite coincide within error with the age of deposition inferred from fossils demonstrating a very rapid geological evolution. Plutons of peraluminous affinity are somewhat younger at 436.0 ± 1.0 Ma (Skarsvåg ...

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