Dynamics of the Ocean Floor


On/offshore deep electrical conductivity structure to investigate the Walvis Ridge magmatism and its interaction with the Kaoko Mobile Belt in northern Namibia

Duration: 01.01.2009 - 31.12.2011

Sponsored by: DFG within the framework of SPP SAMPLE

Applicants: PD Dr. Oliver Ritter, GeoForschungszentrum Potsdam, Dr. Ute Weckmann, GeoForschungszentrum Potsdam, Dr. Marion Jegen-Kulcsar

The Kaoko Belt in northern Namibia is characterized by large NNW striking structures generated during late Neoproterozoic continental collision. These old regional structures played an important role in the tectonic evolution of the Kaoko Belt and are intimately related with the evolution of adjacent marginal Walvis basin. Where the Walvis ridge meets the continental crust, gabbroic complexes and basic dykes intersect with the flood volcanics and the Etendeka rocks. Within the framework of this project we intend to determine (i) along-strike variability, homogeneity, and extent of magmatic rocks (ii) the influence of pre-existing structure on the emplacement of magmas (iii) a complete deep electrical conductivity section of a passive continental margin and the adjacent continental lithosphere.

For the first time we will (i) combine on- and offshore MT measurements in a passive margin setting and (ii) be able to integrate electrical conductivity with deep seismic data along the entire length of an amphibian profile.

Research area

Location map of the proposed on/offshore MT profiles in NW Namibia: a) both, on- and offshore MT profiles are coincident with the seismic on/off-shore work (see SPP SAMPLE proposals by Ryberg et al., Behrmann et al.). The offshore MT stations are aligned along the axis of the Walvis Ridge (in red). One of the coast-parallel profiles (black lines) will also be equipped with offshore MT stations. (b) The onshore continuation of the MT work concentrates on the Koako Mobile Belt (EKZ: Eastern Kaoko Zone, CKZ: Central Kaoko Zone, WKZ: Western Kaoko Zone, PMZ: Purros Mylonitic Zone) and its transition into the Congo Craton. The shorter NW-SE oriented


R/V Maria S. Merian

MSM17/1, 23.11.2010-29.12.2010, Mindelo (Cape Verde Islands) - Walvis Bay (Namibia)

Cruise Report



Project leader:
Dr. Marion Jegen-Kulcsar
Tel.: +49 0431 600 2560
Fax: +49 0431 600 2922
e-mail: mjegen(at)geomar.de