1.83—1.82 Ga formation of a juvenile volcanic arc—implications from U—Pb and Sm—Nd analyses of the Oskarshamn-Jönköping Belt, southeastern Sweden

Trans-Baltic Palaeoproterozoic correlations towards the reconstruction of supercontinent Columbia/Nuna

“…An overlying sequence of weakly metamorphosed quartzites contains detrital zircon as young as 1.76-1.75 Ga (Krzeminska et al, 2011). In combination with the results of current comprehensive geochronological work on the basement rocks of the region (Krzeminska et al, 2014), this age pattern resembles that of the Late Svecofennian evolution in SE Sweden, where the formation of the juvenile 1.83-1.82 Ga Oskarshamn-Jönköping volcanic arc (Mansfeld et al, 2005) was followed by the voluminous bimodal magmatism that formed the older, 1.81-1.76 Ga generation of rocks referred to the Transscandinavian Igneous Belt (TIB-1 in Högdahl et al, 2004).…”

Early to Late Paleoproterozoic magmatism in NE Brazil: The Alto Moxotó Terrane and its tectonic implications for the Pre-West Gondwana assembly

“…Polycyclic Paleoproterozoic evolution is well documented in orogenic terranes worldwide, mostly directly related to Paleoproterozoic supercontinents, such as the Trans-North China Belt orogen (Faure et al, 2004), Trans-Hudson orogen in the USA/Canada (White et al, 2000;Corrigan et al, 2009;Maxeiner et al, 2005), Ungava Orogen in Canada (St-Onge et al, 1992, 2000, and Oskarshamn-J€ onk€ oping Belt in Sweden (Manfeld et al, 2005;Ski€ old and Rutland, 2006). On the other hand, Statherian-Caliminian extensional events are also coherent with worldwide descriptions and are commonly referred to as the early break-up stages of large Paleoproterozoic land masses (Condie, 2002;Zhao et al, 2004;Meert, 2012).…”

Sr–Nd isotope and geochemical characterisation of the Paleoproterozoic Västervik formation (Baltic Shield, SE-Sweden): a southerly exposure of Svecofennian metasiliciclastic sediments

“…1b) is exposed some 60 km south of Västervik and interpreted to represent an island arc that accreted onto the Svecofennian margin (Mansfeld 1996;Å häll and Larson 2000). The OJB is characterised by volcanic, sedimentary and intrusive rocks that were emplaced from 1.84 to 1.82 Ga (Mansfeld 1996;Mansfeld et al 2005). The relation between OJB and Västervik sediments cannot be studied in the field as both are in direct contact and/or surrounded by younger granitoid rocks of the Transscandinavian Igneous Belt (TIB).…”