At Institut für Angewandte Geowissenschaften der Universität Karlsruhe (TH),
in the section of Strukturgeologie und Tektonophysik we search a candidate
for a half time
Ph.D. position (Doktorandin/Doktorand; TV-L, E13/2)
within the SPP 1375 South Atlantic Margin Processes and Links with Onshore
Evolution sponsored by the DFG. Funds are granted for 18 months, with a
possibility for extension, subject to evaluation. Please apply before March,
15th to: Reinhard O. Greiling (Tel. +49 721/608-2141, [log in to unmask]).
Topic: mafic dyke swarms provide a record of the orientation, mechanism, and
timing of crustal extension. This project will incorporate these aspects in a
study of the largest mafic dyke swarm in Namibia. The planned work will build
on extensive existing geochemical datasets and will concentrate on aspects of
timing and mechanisms of magma emplacement. Field work and sampling will be
guided by previous remote sensing, field and geochemical studies of mafic
dykes in the Henties Bay-Outjo dyke swarm from coastal and inland NW
Namibia. It will comprise structural work on dykes and host rocks in order to
assess potential reactivation of older structures. For the structural and
tectonic aspects of dyke emplacement, the main focus is application of the
AMS (anisotropy of magnetic susceptibility) method, backed up by careful
magnetomineralogy, to determine the degree and orientation of flow fabric in
the dykes and thus understand the dynamics of magma flow and intrusion
within the continental crust during continental rifting. Post-intrusion tilting of
dykes is to be tested by palaeomagnetic work. AMS will also be applied to test
for postintrusion structural overprints. These fabric studies will be
complemented by microstructural work. It is expected that the project will
provide important new information on the timing and the interrelationships of
extensional tectonics and magma emplacement during continental break-up
and evolution of the volcanic continental margin.
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