Comparación de los Complejos Intrusivos de Jörn y Viterliden en el distrito minero de Skellefte, norte de Suecia
2007
The Skellefte Mining District is located in the northern Sweden, in an early Proterozoic (1.90-1.87 Ga)
volcanic arc province in the Baltic Shield. It is composed by a complex submarine volcanosedimentary
succession named Skellefte Group overlain by shallow- to deep-marine sedimentary rocks and mafic
volcanics named the Vargfors Group, at the top occurs a subaerial felsic volcanic succession named the
Arvidsjaur Group (Allen et al., 1996). Among the intrusions in the area, the Jorn Granitoid Complex (JGC)
and the Viterliden Intrusive Complex (VIC) are the most significant and crops out in the central and
westernmost area of the Skellefte district respectively. Both complexes emplaced at similar ages and igneous
rocks are similar in bulk composition. Also, they show similar relationships with the Skellefte volcanics, as
in both cases early plutonic phases are coeval with volcanics whereas late plutonism postdates the Skellefte
group. In contrast, JGC and VIC markedly differ in deformation and metamorphic style. We show that the
metamorphism in the JGC is mainly static, whereas the VIC is related to regional deformation producing
intense ductile deformation. Also, a number of mineral phases, including amphiboles, distinctly differ in
composition from the Jorn to the VIC area. We conclude that metamorphism in the VIC and the JGC
occurred in contrasting tectonic settings.
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