HR: 11:05h
AN: S32B-04    [Abstracts]
TI: Fault-Segment Linkage during Rifting in the Initial Phase of Basin Evolution: A North German Case Study
AU: * Lohr, T
EM: lohr@gfz-potsdam.de
AF: GFZ Potsdam, Telegragenberg, Potsdam, 14473 Germany
AU: Krawczyk, C M
EM: lotte@gfz-potsdam.de
AF: GFZ Potsdam, Telegragenberg, Potsdam, 14473 Germany
AU: Tanner, D C
EM: dtanner@gwdg.de
AF: GZG Göttingen, Universität Göttingen Goldschmidtstraße 3, Göttingen, 37077 Germany
AU: Oncken, O
EM: oncken@gfz-potsdam.de
AF: GFZ Potsdam, Telegragenberg, Potsdam, 14473 Germany
AU: Endres, H
EM: endres@teec.de
AF: TEEC, Burgwedelerstraße 89, Isernhagen, 30916 Germany
AU: Samiee, R
EM: samiee@teec.de
AF: TEEC, Burgwedelerstraße 89, Isernhagen, 30916 Germany
AU: Trappe, H
EM: trappe@teec.de
AF: TEEC, Burgwedelerstraße 89, Isernhagen, 30916 Germany
AU: Kukla, P A
EM: kukla@geol.rwth-aachen.de
AF: RWTH Aachen, Geol. Institut Wüllnerstraße 2, Aachen, 52056 Germany
AB: In general, rift systems are characterized structurally by grabens and half-grabens. During the rifting period extensional fault systems commonly develop from individual segments with isolated sub-basins to zones of interacting fault systems. This leads to segment linkage, accommodation zones or relay ramps, which can result in polarity changes of fault systems along the rift axis. We show examples from a 3-D seismic survey located in the NW German Basin, a sedimentary basin where oblique rifting during the Permian produced a fracture system of nearly N-S striking normal faults. We interpret these syn-sedimentary graben faults in 3-D and analyze them in terms of morphology, segment linkage and relay ramps using seismic interpretation and modelling tools. Analysis of the fault morphology indicates fault segments coalesced through breached relay structures. A prominent, helicoidally-shaped fault points to segment linkage between oppositely-dipping faults, in which a polarity change occurred along a length of only 2 to 3 km. Clarifying the spatial and temporal development of the graben faults observed in the study area in terms of lithology and reactivation of older structures will yield the input for modelling studies, and finally allow the comparison with natural data sets at different scales.
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Seismology [S]
MN: Fall Meeting 2005