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Indications for the developements of the Cenozoic sedimentation enviroment in the southern Cape Basin.

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Citation:
Weigelt, E. (2001): Indications for the developements of the Cenozoic sedimentation enviroment in the southern Cape Basin. , European Union of Geosciences, Strassburg. .
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Abstract:

The Benguela Current System is part of one of the greatest upwelling regions of the world. Due to its high sedimentation rates it represents an excellent climate archive and offers the possibility of paleooceanographic reconstructions.As part of ODP Leg 175, three sites (Sites 1085, 1086, 1087) were drilled in the southern part of the Cape Basin. At two of the sites downhole logging was carried out (Sites 1085 and 1087). With a maximum depth of 610mbsf (Site 1085a) the sites span the time period between Holocene and late Miocene (0-15 Ma).The location of the sites were chosen in order to document the history of the Benguela Current and contain information on both, the influence of warm water from the Indian Ocean, brought by the Agulhas Current, as well as incursions of cold Antarctic waters. Beside climate informations (e.g. glacial-interglacial stages) the sites contain records of slumping events.In order to reconstruct the development of the upwelling system and to identify modifications within the circulation system in the southern Cape Basin, the results of the ODP Leg 175 Sites 1085-1087 are correlated with seismic data collected in 1996 during the METEOR Cruise M34/1.Aim is to extrapolate the informations of the sites spatially.In this contribution we present a first correlation between the properties of the sites and the seismic profiles. Base for this link are synthetic seismograms, derived from density and P-wave velocity data of the cores and loggins, as well as all other available data like sedimentological parameters (e.g.grain size), bio- and magnetostratigraphy, magnetic susceptibility, natural gamma ray, resistivity, and chemical properties (e.g. carbon and carbonate content).

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