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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Gabon
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Oklo (1)
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Kalahari Desert (1)
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Southern Africa
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Barberton greenstone belt (1)
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South Africa
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Bushveld Complex (6)
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Free State South Africa
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Vredefort Dome (9)
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Gauteng South Africa
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Johannesburg South Africa (5)
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Klerksdorp Field (5)
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KwaZulu-Natal South Africa (1)
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Mpumalanga South Africa (2)
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upper Precambrian
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Pretoria Group (1)
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Ventersdorp Supergroup (13)
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Waterberg System (1)
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igneous rocks
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Primary terms
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absolute age (13)
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Africa
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Central Africa
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Gabon
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Oklo (1)
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Kalahari Desert (1)
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Southern Africa
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Barberton greenstone belt (1)
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Kaapvaal Craton (15)
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Karoo Basin (1)
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South Africa
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Bushveld Complex (6)
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Cape fold belt (1)
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Free State South Africa
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Vredefort Dome (9)
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Gauteng South Africa
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Johannesburg South Africa (5)
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Klerksdorp Field (5)
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KwaZulu-Natal South Africa (1)
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Mpumalanga South Africa (2)
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North-West Province South Africa
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Ventersdorp South Africa (2)
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Transvaal region (26)
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Witwatersrand (38)
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Swaziland (1)
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Zimbabwe
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Belingwe greenstone belt (1)
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West Africa
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Ghana (1)
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Zimbabwe Craton (1)
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Asia
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Siberia (1)
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Australasia
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Australia
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Western Australia
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Pilbara (1)
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bacteria (1)
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bitumens (2)
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Canada
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Western Canada
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carbon
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igneous rocks
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Pb-207/Pb-206 (1)
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manganese (1)
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metamorphic rocks
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gneisses
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orthogneiss (1)
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hornfels (1)
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metasedimentary rocks
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metaconglomerate (1)
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metapelite (1)
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quartzites (5)
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schists
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nodules (1)
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Swaziland Supergroup (3)
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Central Rand Group (16)
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Fortescue Group (1)
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Hamersley Group (1)
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Pongola Supergroup (5)
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upper Precambrian
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soils
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GeoRef Categories
Era and Period
Book Series
Date
Availability
Witwatersrand Supergroup
A new interpretation of soft-sediment deformation features (SSDs) in the Parktown Formation (lower West Rand Group); the physical processes of deformation during deposition Available to Purchase
New details on the volcanic and tectonic evolution of the Mesoarchaean Dominion Group with special reference to the Syferfontein Formation in the Ottosdal area (South Africa) Available to Purchase
Factors responsible for Witwatersrand gold mineralisation Available to Purchase
New palaeomagnetic results from the Mesoarchaean Nsuze flood basalts, South Africa Available to Purchase
A Review of the geological history of the Evander Basin with new insights into the deposition of the Kimberley Formation Available to Purchase
Fire and Water: Geometallurgy and Extractive Metallurgy Free
Manganese carbonate-bearing mudstone of the Witwatersrand-Mozaan succession in southern Africa as evidence for bacterial manganese respiration and availability of free molecular oxygen in Mesoarchaean oceans Available to Purchase
A positive syn-fold test from the Neoarchaean Klipriviersberg Group of South Africa: Quo vadis Vaalbara? Available to Purchase
Amphibolite facies metamorphism in lower Witwatersrand Supergroup rocks exposed in the Vredefort Dome – a Ventersdorp LIP connection Available to Purchase
Application of Machine-Learning Algorithms to the Stratigraphic Correlation of Archean Shale Units Based on Lithogeochemistry Available to Purchase
Source-to-Sink Analysis of the Gold-Hosting Mesoarchean Main and Mondeor Formations (Central Rand Group) in the Area South of Johannesburg, Witwatersrand Basin, Kaapvaal Province, South Africa Available to Purchase
A geochemical study of the Crown Formation and Bird Member lavas of the Mesoarchaean Witwatersrand Supergroup, South Africa Available to Purchase
Dynamics of collapse of an impact central uplift: Evidence from folds and faults in the collar of the Vredefort Dome, South Africa Available to Purchase
ABSTRACT Structural analysis of overturned metasedimentary strata of the lower Witwatersrand Supergroup in the inner collar of the Vredefort Dome reveals the presence of tangential folds and faults associated with the 2.02 Ga impact. The folds are distinct from previously identified subradially oriented, vertical to plunging-inclined, gentle folds that are interpreted as the products of convergent flow (constriction) during the initial stages of central uplift formation. The tangential folds comprise disharmonic, open, asymmetric, horizontal to plunging-inclined anticline-syncline pairs with centripetally dipping axial planes and right-way-up intermediate limbs. They display centripetal-down vergence (anticline radially outward of the syncline) that is consistent with steep inward-directed shear of the overturned strata. We attribute this kinematic pattern to subvertical collapse of the Vredefort central uplift during the latter stages of crater modification. The folds are cut by pseudotachylite-bearing steep to vertical tangential faults that display center-down slip of <10 m up to ~150 m. Both the tangential folds and the faults suggest that the large-scale overturning of strata related to outward collapse of the Vredefort central uplift was accompanied by a component of inward-directed collapse via layer-parallel shearing and folding, followed by faulting. Subradially oriented faults with conjugate strike separations of 1–2 km in the NNE collar of the dome suggest penecontemporaneous tangential extension of the inner collar rocks. This evidence indicates that second-order structures in the metasedimentary collar of the Vredefort Dome preserve a complex, multistage record of evolving strain associated with both initial convergent and upward flow (constriction) related to central uplift rise and later divergent and downward flow (flattening) linked to its collapse, and that centripetally directed collapse features may be important components of the structural inventory of very large central uplifts.