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Bremner, J.M. and Willis, J.P. 1993. Mineralogy and geochemistry of the clay fraction of sediments from the Namibian continental margin and the adjacent hinterland. Marine Geology, 115(1–2): 85–116


Description:

Mineralogy and geochemistry of the clay fraction of sediments from the Namibian continental margin and the adjacent hinterland.

Summary / Notes:

The continental shelf off Namibia can be divided into two sectors at latitude 18°40′S based on the distinctive morphologies of the two regions, and on differences in composition of their surficial sediments. The Kunene Shelf is narrow, shallow and covered mainly by terrigenous sediment whereas the Walvis Shelf is wide, deep and supports predominantly biogenic sediment. The Walvis Shelf also possesses a number of distinguishing features. Its outer region has a concave profile, which is attributed to upbuilding of the inner shelf during periods of lowered sea level. Its inner region is covered by an extensive belt of diatomaceous mud parallel to the coast. The seaward and landward flanks of this deposit differ in lithology due mainly to the advanced state of dissolution of opal in deep water, and to the influx of aeolian terrigenous detritus, especially illite, close to shore. Long belts of terrigenous mud extend southwards from both the Kunene and Orange Rivers. The currents responsible for transporting this sediment are poleward-directed tongues of the Angola-Benguela Front in the north, and mixed, poleward-moving South Atlantic Central Water in the south. The Kunene River carries more smectite to the sea than the much larger Orange.

Year: 1993

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/0025322793900768


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