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Keine Mehrfachexemplare zur Abgabe mehr vorhanden. - Geophysics, controlled-source seismic Survey, onshore, offshore, continental margin, Namibia
Abstract:
Passive continental margins offer the unique opportunity to study the processes involved in
continental extension and break up as well as the role of hot-spot related magmatism. We
conducted combined on- and offshore seismic experiments in Northern Namibia designed to
characterize the Southern African passive margin at the interaction with the Walvis Ridge, to
assess the interaction of the presumed plume with continental lithosphere and to determine the
deep structure of the transition from the coastal fold belt to the stable craton, where the Walvis
Ridge hits the African continent. The seismic project integrated three experiments, (A) an onshore,
coast-parallel refraction seismic profile, (B) two onshore-offshore wide-angle seismic transects,
and (C) a combined on- and offshore seismic experiment to image the sub-Moho velocity (Pn
tomography) at the ocean-continent transition (Fig. 1). The knowledge of the lithospheric structure
of the margin together with results from other geoscientific studies (e.g., conducted within the SPPSAMPLE,
DFG Priority Program 1375, South Atlantic Margin Processes and Links with onshore
Evolution) will help to address fundamental questions such as, how continental crust and plume
head interact, what the extent and volumes of magmatic underplating is, and how and which
inherited (continental) structures might have been involved and utilized in the break-up process.
