Diverse sources of crustal granitic magma: Lu–Hf isotope data on zircon in three Paleoproterozoic leucogranites of southern Finland

1.8 Ga magmatism in southern Finland: strongly enriched mantle and juvenile crustal sources in a post-collisional setting

“…Although this does not preclude metasedimentary source components for these granites, it shows that juvenile, metaigneous rocks may be a major component. Similar conclusions were reached for the late-orogenic Svecofennian granites in Sweden and Finland (Patchett et al 1987;Andersson 1991;Claesson and Lundqvist 1995;Kurhila et al 2010). Mixing of magmas in the source region of similar leucocratic granite batholiths, from metasedimentary and metaigneous protoliths, has recently been documented by Reichardt et al (2010).…”

“…Furthermore, the La/Nb ratios are significantly higher than in crustal rocks ( Figure 14). Kurhila et al (2010). Chondritic uniform reservoir (CHUR) and depleted mantle (DM) growth curves follow those in Andersen et al (2009), with CHUR from Bouvier et al (2008) and DM modified from Griffin et al (2000).…”

“…Ranges of variation are shown for Archaean granites, early Svecofennian mafic rocks (ESM), early Svecofennian felsic rocks (ESF), late-orogenic Svecofennian granites (LSG; Puruvesi granite, near Petravaara, is plotted separately), ca. 1.8 Ga granites in the Archaean Karelian domain, Transscandinavian Igneous Belt rocks (TIB) in Sweden, and anorogenic rapakivi granites in Finland (Patchett et al 1981;Vervoort and Patchett 1996;Andersson et al 2008;Andersen et al 2009;Kurhila et al 2010;Lauri et al, in review). The data from Patchett et al (1981), Vervoort and Patchett (1996), and Kurhila et al (2010) are recalculated after Scherer et al (2001Scherer et al ( , 2007, Söderlund et al (2004), and Bouvier et al (2008).…”

“…1.8 Ga granites in the Archaean Karelian domain, Transscandinavian Igneous Belt rocks (TIB) in Sweden, and anorogenic rapakivi granites in Finland (Patchett et al 1981;Vervoort and Patchett 1996;Andersson et al 2008;Andersen et al 2009;Kurhila et al 2010;Lauri et al, in review). The data from Patchett et al (1981), Vervoort and Patchett (1996), and Kurhila et al (2010) are recalculated after Scherer et al (2001Scherer et al ( , 2007, Söderlund et al (2004), and Bouvier et al (2008). The arrows represent the evolution of juvenile Svecofennian crust and a possible evolution trend for 'mildly depleted' Fennoscandian lithospheric mantle (from Andersen et al 2009).…”

Zircon crystal morphology and internal structures as a tool for constraining magma sources: Examples from northern Portugal Variscan biotite-rich granite plutons

“…Therefore, their crystal morphology and their internal structures could be an important clue to understand which processes lead to the wide scatter of ages and Hf isotopes, as it has been highlighted in several papers (e.g., Belousova et al, 2009;Condie et al, 2005;Gerdes and Zeh, 2009;Hawkesworth and Kemp, 2006;Kurhila et al, 2010;Orejana et al, 2011;Shaw et al, 2011;Villaseca et al, 2012).…”