Submarine Fan Through Slope to Deltaic Transition Basin-Fill Succession, Tanqua Karoo, South Africa
Grant D. Wach, Theodore C. Lukas, Robert K. Goldhammer, H. Deville Wickens, A. H. Bouma, 2000. "Submarine Fan Through Slope to Deltaic Transition Basin-Fill Succession, Tanqua Karoo, South Africa", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
Download citation file:
Superb sections of submarine fan deposits within the Late Permian Ecca Group are exposed within the Tanqua Karoo basin. Five discrete fan systems are capped by shales and deltaic deposits of the Kookfontein and equivalent Koedoesberg formations. Progradation of the deltaic deposits across the basin was in response to a decrease in accommodation space created by relatively high rates of sedimentation within the foreland basin setting. Evidence for the transition from submarine fans to deltaic deposition has been enigmatic, with limited evidence of sediments representative of slope deposition.
The sedimentology and sequence stratigraphy of the Hangklip Fan represents a slope fan and channel complex that shallows up into deltaic deposits, coincident with decresing accomodation space. Erosional slump scars, cutting into laminated shale with chaotic infill of sand intraclasts, point toward slope depositional processes that are not in evidence in the underlying submarine fan deposits. Wave ripples and the trace fossil Gyrochorte suggest substantially shallower depositional conditions than either the submarine fan or slope fan deposits, which are devoid of such features.
Figures & Tables
This Memoir covers one of the most important and active exploration reservoirs being pursued by geoscientists worldwide: fine-grained turbidite systems. 28 chapters show the results of an intense research effort in the 1990s that resulted from the discovery of large hydrocarbon accumulations in fine-grained turbidite systems in Brazil, the Gulf of Mexico, West Africa, and the North Sea. Industry and academia have joined together in this publication and the result is a unique opportunity to study these turbidite systems from the outcrop to the modeling; through the interpretation with 2-D and 3-D seismic data; to case histories and analog studies from Arkansas and Oklahoma, South and West Africa, Gulf of Mexico, west Texas, and New Zealand.