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Detailed studies on clay mineralogy and inorganic geochemistry performed on late Campanian to late Paleocene sediments of DSDP Sites 525, 527, 528, and 529 provide paleoenvironmental information about the CretaceousTertiary transition in the Walvis Ridge area. They suggest (1) the existence of an average hot and humidity-contrasted climate on adjacent land masses, favoring the development of coastal areas with poorly drained soils (smectites) and the formation during the Paleocene of peri-marine confined basins (palygorskite); (2) the importance during the Late Cretaceous of local volcanic supply at the shallowest site (525), of distant terrigenous supply at the deepest site (527), and western migration of the spreading center; (3) the occurrence during the late Maestrichtian of three tectonic phases on the African margin, suggested by a strong illite supply and attributed to a major stage of seafloor spreading; and (4) a marked change in the mineralogy at the Maestrichtian/Paleocene boundary (smectite increase), indicative of tectonic relaxation and possibly local volcanic activity, preceding the subsidence of the Walvis Ridge and the development of deep-water circulation.

Paleoenvironmental History of the Walvis Ridge at the Cretaceous-Tertiary Transition, from Mineralogical and Geochemical Investigations