Tectonic evolution of the Aggeneys-Gamsberg Ore District, South Africa, and implications for the geodynamic setting of the Namaqua Sector

•Structural observations yield a relative timeline of geological events.•This is linked to a compilation of new and existing zircon U-Pb geochronology.•Ores and sediments were deposited shortly before ∼ 1.2 Ga tectonomagmatism.•The district was at shallow levels during ∼ 1.08 Ga contraction.•Major sheath folds formed at peak T during ∼ 1.03 Ga gravitational collapse.