The Archaean Karelia and Belomorian Provinces, Fennoscandian Shield

Geochronology of the Palaeoproterozoic Kautokeino Greenstone Belt, Finnmark, Norway: Tectonic implications in a Fennoscandia context

“…The Fennoscandian Shield hosts a rich geological record of the Archaean to Palaeoproterozoic evolution of the Earth (Daly et al, 2006;Slabunov et al, 2006;Hölttä et al, 2008). In the northeastern part of the shield (Fig.…”

Early Paleoproterozoic felsic and mafic magmatism in the Karelian province of the Fennoscandian shield

“…1) extends from northern Sweden and Norway to southeastern Finland and northwestern Russia (Hölttä et al, 2008). The Archean domain may be divided into five provinces (Murmansk, Kola, Belomoria, Karelia and Norrbotten), each of which displays distinct geological history based on age, composition and metamorphism.…”

“…3.5 Ga old tonalitictrondhjemitic gneisses, however, the Paleoarchean and early Mesoarchean units are sparse and scattered and the major part of the crust was formed in the Neoarchean, between 2.85 Ga and 2.70 Ga (Hölttä et al, 2008 and references therein). The Karelian province displays the typical evolution from early TTG magmatism and greenstone belt activity to sanukitoid magmatism and intrusion of anatectic leucogranitoids during the collisional stage that amalgamated the separate crustal fragments (Hölttä et al, 2008).…”

Geology and metallogenic potential of the northwesternmost Norrbotten Province around Altevatn in Troms, northern Norway

“…The northeastern Fennoscandian Shield is typically divided into five provinces, variably affected by Palaeoproterozoic processes (Hölta et al, 2008). These provinces include the Murmansk, Kola, Belomorian, Karelian and Norrbotten province (Fig.…”

“…1). Archaean rocks predominate in the northeast, and include tonalitetrondhjemite-granodiorite (TTG) suites, subordinate greenstone belts and paragneisses, yielding ages mainly between 2.9 and 2.7 Ga (Hölta et al, 2008 and references therein). High-grade metamorphic events recorded in these rocks include 2.9-2.7 Ga, eclogite-or granulitefacies metamorphism, as well as younger, c. 1.9 Ga, highgrade metamorphic overprinting Mints et al, 2010;Skublov et al, 2011), related to Fennoscandian reamalgamation.…”