scholarly journals Shelf-margin clinothem progradation, degradation and readjustment: Tanqua depocentre, Karoo Basin (South Africa)

Sedimentology ◽  
2017 ◽  
Vol 65 (3) ◽  
pp. 809-841 ◽  
Author(s):  
Luz E. Gomis-Cartesio ◽  
Miquel Poyatos-Moré ◽  
David M. Hodgson ◽  
Stephen S. Flint
Keyword(s):  
South Africa ◽  
Karoo Basin ◽  
Shelf Margin

Lithostratigraphy of the Kookfontein Formation (Ecca Group, Karoo Supergroup), South Africa

2017 ◽  
Vol 120 (3) ◽  
pp. 447-458
Author(s):  
H. de V. Wickens ◽  
D.I. Cole
Keyword(s):  
South Africa ◽  
Depositional Environment ◽  
Delta Front ◽  
Southwestern Part ◽  
Fine Grained ◽  
Karoo Basin ◽  
Deformation Features ◽  
Stratigraphic Position ◽  
Shelf Margin ◽  
Upper Slope

Abstract The Permian Kookfontein Formation forms part of the upper Ecca Group in the southwestern part of the main Karoo Basin of South Africa. It occupies a stratigraphic position between the underlying Skoorsteenberg Formation and the overlying Waterford Formation, with its regional extent limited to the cut-off boundaries of the Skoorsteenberg Formation. The Kookfontein Formation has an average thickness of 200 m, coarsens upwards, and predominantly comprises dark grey shale, siltstone and thin- to thick-bedded, fine- to very fine-grained, feldspathic litharenite. Characteristic upward-coarsening and thickening successions and syn-sedimentary deformation features reflect rapid deposition and progradation of a predominantly fluvially-dominated prodelta and delta front slope environment. The upward increase in the abundance of wave–ripple marks further indicates a gradual shallowing of the depositional environment through time. The upper contact with the Waterford Formation is gradational, which indicates a transition from deposition in an unstable upper slope/shelf margin environment to a more stable shelf setting.

ASSESSING PERMO-TRIASSIC TERRESTRIAL PALEOCLIMATE TRENDS OF CALCIC PALEOVERTISOLS WHEN STRATIGRAPHICALLY ABSENT IN THE KAROO BASIN, SOUTH AFRICA

2018 ◽  
Author(s):  
Robert A. Gastaldo ◽  
◽  
Johann Neveling ◽  
Neil J. Tabor ◽  
John W. Geissman
Keyword(s):  
South Africa ◽  
Karoo Basin

scholarly journals A Lacustrine Glacier Retreat Sequence from the Permo-Carboniferous Dwyka Formation, Republic of South Africa

1983 ◽  
Vol 29 (103) ◽  
pp. 515-520
Author(s):  
J. N. J. Visser
Keyword(s):  
South Africa ◽  
Lacustrine Sediments ◽  
Glacier Retreat ◽  
Marine Transgression ◽  
Northern Margin ◽  
Valley Fill ◽  
Karoo Basin ◽  
Ice Retreat ◽  
Glacier Advance

Abstract The upper part of a Permo-Carboniferous glacial valley fill along the northern margin of the Karoo Basin includes glacio-lacustrine sediments. During the last glacier advance into the lake, a bedded heterogeneous diamictite facies was deposited and, on glacier retreat, a sequence of deformed siltstones with diamictite lenses and sandstone beds, varved shale and rhythmite shale was laid down. Black carbonaceous mud was deposited during the subsequent marine transgression. According to varve counts, the glacier receded from the valley over a period of 500 to 1 000 years and it is concluded that the overall ice-retreat rate during the Permo-Carboniferous deglaciation was relatively high.

Latest Permian insects from Wapadsberg Pass, southern Karoo Basin, South Africa

2021 ◽  
Author(s):  
Abraham I Pretorius ◽  
Conrad C Labandeira ◽  
André Nel ◽  
Rose Prevec
Keyword(s):  
South Africa ◽  
Karoo Basin

U-Pb zircon ages from the southwestern Karoo Basin, South Africa--Implications for the Permian-Triassic boundary

Geology ◽  
2009 ◽  
Vol 37 (8) ◽  
pp. 719-722 ◽  
Author(s):  
A. Fildani ◽  
A. Weislogel ◽  
N. J. Drinkwater ◽  
T. McHargue ◽  
A. Tankard ◽  
...  
Keyword(s):  
South Africa ◽  
Triassic Boundary ◽  
Karoo Basin ◽  
Permian Triassic Boundary

scholarly journals Stochastic Risk and Uncertainty Analysis for Shale Gas Extraction in the Karoo Basin of South Africa

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Abdon Atangana ◽  
Gerrit van Tonder
Keyword(s):  
South Africa ◽  
Mass Transport ◽  
Sampling Method ◽  
Latin Hypercube Sampling ◽  
Transport Equations ◽  
Upward Migration ◽  
Karoo Basin ◽  
Fracking Fluid ◽  
Stochastic Risk ◽  
Flow And Mass Transport

We made use of groundwater flow and mass transport equations to investigate the crucial potential risk of water pollution from hydraulic fracturing especially in the case of the Karoo system in South Africa. This paper shows that the upward migration of fluids will depend on the apertures of the cement cracks and fractures in the rock formation. The greater the apertures, the quicker the movement of the fluid. We presented a novel sampling method, which is the combination of the Monte Carlo and the Latin hypercube sampling. The method was used for uncertainties analysis of the apertures in the groundwater and mass transport equations. The study reveals that, in the case of the Karoo, fracking will only be successful if and only if the upward methane and fracking fluid migration can be controlled, for example, by plugging the entire fracked reservoir with cement.

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