Tectono‐sedimentary evolution of the northernmost margin of the NE German Basin between uppermost Carboniferous and Late Permian (Rotliegend)

Abstract

The tectono-sedimentary evolution of the Rotliegend deposits of the northernmost margin of NE German Basin (NEGB) has been analysed on the basis of detailed sedimentary logs of 300 m of core material together with the re-evaluation of 600 km of seismic lines. Three distinct phases were recognized. During the initial Phase I, basin geometry was largely controlled by normal faulting related to deep-seated ductile shearing leading to a strong asymmetric shape, with a steep fault-controlled eastern margin and a gently, dipping western margin. The results of forward modelling along a cross-section ®t the basin geometry in width and depth and reveal a footwall uplift of c. 1000 m. Adjacent to the steep faults, local sedimentation of Lithofacies Type I was con®ned to non-cohesive debris¯ow-dominated alluvial fans, whereas the gently dipping western margin was dominated by alluvial-cone sedimentation.During the post-extensional period (Phase II), cooling of the lithosphere generated additional accommodation space. The sediments of Lithofacies Type II, comprising mainly clast-supported conglomerates, are interpreted as braided ephemeral stream¯ow-surge deposits. Tectonic quiescence and an increase in¯ood events resulting from wetter climate led to progradation of this facies over the entire region. At the end of this period, the accommodation space was almost completely ®lled resulting in a level topography.Phase III was controlled by the thermal-induced subsidence of the southerly located NEGB in post-Illawarra times. The formerly isolated region tilted towards the SW, thus forming the northern margin of the NEGB during uppermost Havel and Elbe Subgroup times. The sediments of Lithofacies Type III were divided into a marginal sandstone-dominated environment and a ®ner-grained facies towards the SW. The former consists of poorly-sorted coarse-grained sandstones of a proximal and medial ephemeral stream oodplain facies. The latter comprise mud¯at ®nes and ®ne-grained distal ephemeral stream deposits. The end of the tectonosedimentary evolution is marked by the basinwide Zechstein transgression.

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“…11) indicate upward-increasing dip angles (blue pattern) in dune-dominated areas with prevailing westward dips, partly superimposed by an irregular pattern of damp sandfl at deposits. Measured west to west-southwest dip directions are in line with the prevailing wind direction from the east to east-northeast described previously (e.g., Gast, 1988;Rieke et al, 2001). Eolian strata of dune origin form the principal reservoir rocks.…”

“…260-259 Ma, early Wuchiapingium;Vack iner et al, 2011). The majority of the eolian sediment was supplied from local sediment sources, such as Carboniferous highs and patchy ande sitic to basaltic volcanic rocks, via eastern trade winds (Gast, 1988;McCann, 1998;Glennie, 1990a;Rieke et al, 2001). In contrast, the source of major fl uvial sediment input was located in the Variscan hinterland toward the south (Glennie, 1990b;Plein, 1993).…”

High-resolution seismic analysis of the coastal Mecklenburg Bay (North German Basin): the pre-Alpine evolution

“…6) evidences the rising of the base Zechstein towards the margin of the North German Basin (the so-called Rügen High or the NE Mecklenburg-Vorpommern High, Fig. 1, Rieke et al 2001). The mean ascent is about 2% with a gradient towards NE.…”

A 3d High Resolution Model of Bounding Surfaces in Aeolian‐fluvial Deposits: An Outcrop Analogue Study From the Permian Rotliegend, Northern Germany

“…The structural evolution of the North German Basin has been extensively studied by authors including Krawczyk and McCann (1999) and van Wees et al (2000); its tectono-sedimentary evolution has been modelled by Rieke et al (2001). Detailed core analyses have been used to investigate sedimentary facies (e.g.…”