From Mesoarchean drips to modern-style tectonics in the Carajás Province, Amazonian Craton

摘要: Abstract The beginning of modern–style plate tectonics on Earth is not a consensus, but many authors suggest that it happened transitionally, from 3.2 to 2.5 Ga. In the Amazonian Craton, Brazil, contrasting crustal architecture Rio Maria and Carajas domains marked by dome–and–keel linear belt, respectively, which may represent shift in tectonic styles along Mesoarchean Neoarchean transition. Here, we discuss this hypothesis combining existing literature an interpretation airborne geophysical data for Caracol Dome. This Archean TTG (Trondhjemite–Tonalite–Granodiorite) Dome shows concentric lithological variation, with older 2.97–2.96 Ga trondhjemites at edges younger 2.95–2.92 Ga tonalites within inner parts. exhibits similar magmatic evolution other domes worldwide (e.g., Yalgoo Mt. Edgar Domes), commonly interpreted as record vertical drip–tectonics). However, subsequent geological Province more likely related onset or transition tectonics, such large continental shelf sedimentation (Carajas Basin), steeply dipping shear zones 2.76–2.73 Ga syn–tectonic intrusions iron oxide–copper–gold (IOCG) mineralization. Finally, late Paleoproterozoic events new (and/or remobilized) IOCG deposits are also recorded Province.