Igneous and metamorphic geochronologic evolution of granitoids in the central Eastern Segment, southern Sweden

Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen

“…1; e.g. Söderlund et al, 1999Söderlund et al, , 2002Möller et al, 2007;Brander et al, 2012;Petersson et al, 2013). Based on metamorphic grade and structural relationships, the Eastern Segment is subdivided into three compartments (Fig.…”

Hallandian 1.45Ga high-temperature metamorphism in Baltica: P–T evolution and SIMS U–Pb zircon ages of aluminous gneisses, SW Sweden

“…47-1.44 Ga (Čečys et al, 2002;Johansson et al, 2006;Čečys and Benn, 2007;Zariņš and Johansson, 2009). This tectonometamorphic and magmatic event is part of the regionally extensive high-grade metamorphic event originally attributed to the 1.47-1.38 Ga Hallandian orogeny (Hubbard, 1975;Söderlund et al, 2002;Möller et al, 2007;Brander et al, 2012). Pervasively gneissic, in places migmatitic, varieties of the 1.47-1.44 Ga intrusions occur at the island of Bornholm (Zariņš and Johansson, 2009;Waight et al, 2012).…”

“…The robust U-Pb system in zircon, however, preserves records of Hallandian high-grade metamorphism, in particular partial melting, also within the high-grade parts of the Eastern Segment (Table 1, Fig. 2;Christoffel et al, 1999;Söderlund et al, 2002;Möller et al, 2007;Brander et al, 2012). The late-Hallandian evolution recorded in the Eastern Segment demonstrates that the Hallandian orogeny terminated with granite-norite-charnockite magmatism, locally associated with fluid-assisted metamorphism, at 1.42-1.38 Ga (Hubbard, 1975;Åhäll et al, 1997;Christoffel et al, 1999;Andersson et al, 1999;Rimša et al, 2007;Harlov et al, 2006Harlov et al, , 2013Johansson et al, 2013).…”

Mesoproterozoic continental growth: U–Pb–Hf–O zircon record in the Idefjorden Terrane, Sveconorwegian Orogen

“…The upper level contains 1.81-1.77 Ga and 1.74-1.66 Ga granite to syenite plutonic rocks intruded in the southern parts by 1.47-1.38 Ga Hallandian plutons (Johansson et al, 1993;Brander et al, 2012) and 1.28-1.22 Ga plutons (Hansen and Lindh, 1991;Berglund, 1997;Söderlund and Ask, 2006;Jarl, 2002).…”

“…This basement was later intruded by the 1.65-1.50 Ga rapakivi granite plutons (Haapala et al, 2005), 1.46-1.44 Ga granite plutons (e.g. Obst et al, 2004;Cečys and Benn, 2007;Brander and Söderlund, 2009;Zariņš and Johansson, 2009;Waight et al, 2012;Petersson et al, 2013) and several generations of dolerites including the 1.46 Ga Tuna dolerites, the 1.27-1.25 Ga Central Scandinavian Dolerite Group and the 0.98-0.95 Ga Blekinge-Dalarna Dolerites (Söderlund et al, 2005Söderlund and Ask, 2006;Brander et al, 2012).…”