Online-Geokolloquium: Montag 09.11.2020

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Titel: Role of inheritance in post-orogenic basin development Caledonian vs. Variscan 

Vortragender: Dr. Hamed Fazlikhani 

GeoZentrum Nordbayern 

Orogenic tectonics usually create a rheologicaly and structurally heterogeneous crust, via juxtaposing different rock types and initiating crustal scale detachment and shear zones. Architecture of post-orogenic basins is usually controlled by inherited rheological and structural heterogeneities via 1) strain localization at the boundary of different basement blocks and weak shear zones, dictating the location at which basin bounding fault initiate and grew and 2) influencing the strike of post-orogenic faults. The main factors influencing physiography of post-orogenic basins are: 1) period and rate of deformation phase, 2) tectonic quiescence between deformation phases modifying lithospheric strength profile, 3) relative orientation of basement domain boundaries and preexisting structures to the maximum horizontal stress and 4) dip angle of preexisting structures. 

In order to better understand post-orogenic basin development, we present and compare our observations from two well studied European orogenies, Caledonian (western Norway) and Variscan (Western Bohemian Massif). Norwegian post-Caledonides is characterized by several extensional phases showing a wide range of interactions between rift and preexisting structures, whereas Western Bohemian massif is mainly characterized by post-orogenic compressional phases. We discuss similarities and differences between post-Caledonian extensional basins onshore and offshore western Norway with post-Variscan compressional basins western Bohemian Massif. 


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