Linking Gold Systems to the Crust-Mantle Evolution of Archean Crust in Central Brazil

The Goiás Archean Block (GAB) in central Brazil is an important gold district that hosts several world-class orogenic deposits. A better comprehension of the crustal, tectono-magmatic, and metallogenic settings GAB essential to accurately define its geological evolution, evaluate crustal growth models, target We present overview systems, regional whole-rock Sm-Nd analyses have been used constrain evolution GAB, augment this with new situ zircon U-Pb Hf-O isotope data. deposits show variable host rocks, structural settings, hydrothermal alteration, ore mineralogy, but they represent epigenetic formed during same event. overprinting metamorphic assemblages by mineralogy suggests event post-peak metamorphism. grade rocks predominantly greenschist, locally reaching amphibolite facies. Isotope-time trends support a Mesoarchean origin ocean opening at 3000–2900 Ma, reworking 2800–2700 Ma. Crustal was dominated subduction processes via magmatic additions along lithospheric discontinuities craton margins. This promoted architecture composed young, juvenile intra-cratonic terranes old, long-lived reworked framework provided pathways for magmatism fluids drove endowment GAB.