Extensive magmatism and metamorphism at ca. 3.2 Ga in the eastern Kaapvaal Craton

Age disequilibrium between zircon and their granitoid hosts caused by intracrustal reworking: Nd-Hf-Ar isotope evidence of Archaean Granitoids from Barberton Mountain Land (Kaapvaal craton, South Africa)

“…This domain is characterised by a more complex structural and polyphase history (Kisters et al, 2010). The Kaap Valley domain comprises the Kaap Valley and Nelshoogte plutons with emplacement ages of 3223-3229 Ma (Kamo and Davis, 1994;Wang et al, 2020) and 3212-3236 Ma (Kamo and Davis, 1994;De Ronde and Kamo, 2000;Moyen et al, 2019;Wang et al, 2020), respectively and is located at the northwestern flank of the greenstone belt.…”

“…(de Wit, 1998;Schoene et al, 2008) in a narrow time interval between 3106 Ma and 3109 Ma (Kamo and Davis, 1994; J o u r n a l P r e -p r o o f al., 2003). Interestingly, one GGM intrusion (Dalmein pluton), located in the Stolzburg domain, yields a U-Pb zircon age of 3216-3218 Ma (Kamo and Davis, 1994;Wang et al, 2020) that is clearly older than the main GGM intrusion event. The youngest GGM intrusion (Mpageni pluton) most probably represents a small volume of crustal melt that intruded at 2740 Ma (Kamo and Davis, 1994) and is most probably genetically related to the Nelspruit batholith.…”

“…In the late TTG that were emplaced roughly at the time of this metamorphic event at ~ 3.2 Ga (e.g. Kamo and Davis (1994), Poujol et al (2003), Schoene et al (2008) and Wang et al (2020)) and the GGM, which intruded at ~ 3.1 Ga (e.g. Kamo and Davis (1994) and Poujol et al (2003)), no large later overprint is observed (Schoene et al, 2008).…”

“…With regard to the mid-and early Archaean, Hf and Nd isotope signatures J o u r n a l P r e -p r o o f Journal Pre-proof the radiogenic isotope systematics since a major event effected the BML at ca. 3.2 Ga (Dziggel et al, 2002;Stevens et al, 2002;Kisters et al, 2003;Dziggel et al, 2005;Dziggel et al, 2006;Schoene and Bowring, 2010;Lana et al, 2011;Kröner et al, 2018;Wang et al, 2020) that is ca. 250 Ma younger than the emplacement of the early TTG at ~3.45 Ga (Kamo and Davis, 1994;De Ronde and Kamo, 2000;Poujol et al, 2003;Moyen et al, 2019;Laurent et al, 2020;Wang et al, 2020).…”

“…3.2 Ga (Dziggel et al, 2002;Stevens et al, 2002;Kisters et al, 2003;Dziggel et al, 2005;Dziggel et al, 2006;Schoene and Bowring, 2010;Lana et al, 2011;Kröner et al, 2018;Wang et al, 2020) that is ca. 250 Ma younger than the emplacement of the early TTG at ~3.45 Ga (Kamo and Davis, 1994;De Ronde and Kamo, 2000;Poujol et al, 2003;Moyen et al, 2019;Laurent et al, 2020;Wang et al, 2020). In the late TTG that were emplaced roughly at the time of this metamorphic event at ~ 3.2 Ga (e.g.…”