Sequence Stratigraphic Architecture of the Late Permian Tanqua Submarine Fan Complex, Karoo Basin, South Africa
R. K. Goldhammer, H. Deville Wickens, A. H. Bouma, G. Wach, 2000. "Sequence Stratigraphic Architecture of the Late Permian Tanqua Submarine Fan Complex, Karoo Basin, South Africa", Fine-Grained Turbidite Systems, Arnold H. Bouma, Charles G. Stone
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The Late Permian Ecca Group (1300 m thick) in the Tanqua Karoo consists of a basin floor fan complex (400 m thick), overlain by river-dominated deltaic deposits and associated updip fluvial deposits. This succession is subdivided into two “third-order” depositional sequences with several superimposed high-frequency, “fourth-order” depositional sequences. The Tanqua submarine fan complex contains six regionally distinct fan systems (24 to 60 m thick), five of which form a progradational stack, as revealed by their spatial distribution and regional facies variation. The sixth fan is situated to the south and downlaps onto the fifth fan. This long-term (third-order) progradational pattern records a combination of reduced accommodation space and/or increased sediment supply. Each fan system is assigned to the lowstand systems tract of each high-frequency, fourth-order sequence, and the particular attributes of each fan system are a consequence of their respective positions within the lower-frequency third-order sequence.