Paleoarchean detrital zircon ages from the earliest tectonic basin in the Barberton Greenstone Belt, Kaapvaal craton, South Africa

摘要: Abstract Detrital zircon grains in coarse-grained sedimentary rocks of the Noisy formation, (traditionally considered as H6 unit uppermost Hooggenoeg Formation) Paleoarchean Barberton Greenstone Belt (BGB) South Africa, are investigated by laser ablation (LA)-ICP-MS to constrain their U–Pb and 207Pb/206Pb ages for depositional age provenance determination. Drill core field observations indicate that these clastic polymictitic diamictites sandstones. A wide range between ca. 3600 3430 Ma is reported. The youngest detrital grain identified has an 3432 ± 10 Ma, constraining maximum sequence formation a major underlying erosional unconformity. correspond 3460–3430 Ma tonalite–trondjemite–granodiorite (TTG) gneisses Stoltzburg terrane felsic intrusions Formation constitute most Songimvelo Block BGB on Kaapvaal craton. oldest corresponds plutonic sources older proto-continental blocks craton, namely 3509 Ma Steynsdorp 3667–3223 Ma Ancient Gneiss Complex (AGC). This new data indicates provenancial linkage exposed craton at 3432 Ma. It argued here, remnant earliest tectonic basin BGB, developed during accretion uplift 3432 Ma lead In conjunction with drill observations, geochronological constraints presented here support plate-tectonic processes operating proto-Kaapvaal resulted its stable continental landmass early