Geological Evolution of the Karoo Basin in Southern Africa
Summary
The Karoo Basin evolved through successive tectonic and climatic phases during the late Palaeozoic to early Mesozoic, recording the assembly and fragmentation of southern Gondwana. Initial glacial deposits of the Dwyka Group reflect Permo-Carboniferous icehouse conditions, succeeded by marine shales and sandstones of the Ecca Group and fluvial to deltaic sediments of the Beaufort Group. Differential subsidence driven by Gondwanide orogenesis and later extensional rifting accommodated up to 6 000 m of siliciclastic fill, punctuated by widespread Jurassic dolerite sill intrusions. This stratigraphic architecture captures critical environmental transitions across the Permian–Triassic boundary and has become a reference for basin modelling, palaeoclimate reconstructions and resource assessment in sedimentary basins worldwide.
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Technical terms
Karoo Supergroup: A major sedimentary succession of late Palaeozoic to early Mesozoic age in southern Africa, comprising the Dwyka, Ecca and Beaufort groups.
Isochore thickness: The true vertical thickness of a stratigraphic unit, as determined from geophysical or well data to assess subsidence patterns.
U-Pb zircon geochronology: A radiometric dating technique that measures uranium-lead decay in zircon crystals to establish the age of volcanic or detrital layers.
Detrital zircon: Zircon grains eroded from igneous and metamorphic source rocks and deposited in sedimentary basins, used to trace provenance and sediment pathways.
Dolerite sill: A sheet-like intrusion of mafic magma emplaced parallel to sedimentary bedding, commonly found in the Karoo Basin following Jurassic rifting.
References
- U-PB zircon tuff geochronology from the Karoo Basin, South Africa: implications of zircon recycling on stratigraphic age controls. International Geology Review (2015).
- Variations in isochore thickness and depositional surface of the Dwyka, Ecca and Beaufort Groups in the Western Cape Province of South Africa as deduced from 2.5D gravity profile models. Heliyon (2021).
- Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon. International Journal of Earth Sciences (2020).
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