MSc / Thesis (MSc (Earth Sciences))—University of Stellenbosch, 2009. / Fan 2, one of five submarine fan systems of the Tanqua fan complex in the
south-western Karoo Basin, South Africa, is subdivided into Lower, Middle
and Upper units. Here, detailed analysis of the internal architecture and
distribution of lithofacies associations of Middle Fan 2 facilitated the 3-D
visualisation of the sedimentological and stratigraphical changes towards the
pinch-out.
Middle Fan 2 is interpreted to be a lower-fan, sand-rich terminal lobe,
comprising three sandstone-lobe elements, separated by two siltstone interlobe
elements. It is fed by a distributary channel that is hypothetically
positioned to the west-southwest of the study area. The sandstone-lobe
elements pinch out downdip to the north-east and updip to the southsouthwest
in the study area. The consecutive pinch out of lobe elements to
the north-east indicates a progradational stacking pattern similar to the entire
lobe complex.
Palaeocurrent analysis and the interpretation of isopach maps indicate that
the transport direction of Middle Fan 2 was in a north-easterly direction. The
fringes of the lobe and the distribution of internal elements (channels,
amalgamated sheets and sheets) show a finger-like geometry in plan-view, in
contrast to simple radial-lobe bodies that are commonly envisaged.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/2608 |
| Date | 03 1900 |
| Creators | Steyn, Rochelle |
| Contributors | Wickens, H. de V., Hodgson, D., University of Stellenbosch. Faculty of Science. Dept. of Earth Sciences. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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