The Quaternary of the southwest German Alpine Foreland (Bodensee-Oberschwaben, Baden-Württemberg, Southwest Germany)

Ellwanger, Dietrich; Wielandt‐Schuster, Ulrike; Franz, Matthias; Simon, Théo

doi:10.3285/eg.60.2-3.07

Cited by 36 publications

(61 citation statements)

References 24 publications

(23 reference statements)

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“…The formations are bound by unconformities, which are termed, from oldest to youngest, D3 to D1 (Table ; Ellwanger et al . ).…”

Section: Geological Settingmentioning

confidence: 97%

“…(a) Map of basins of the Rhine Glacier, modified after Ellwanger et al . (). The basins are generally younger and deeper towards a more proximal position with respect to the glacier.…”

Section: Geological Settingmentioning

confidence: 97%

“…In the Rhine Glacier area, Ellwanger et al . () differentiated three main formations based on lithostratigraphy (Fig. ).…”

Section: Geological Settingmentioning

confidence: 99%

“…), only a few geophysical data are available from over‐deepened basins in the German part of the Alpine foreland (Ehlers and Gibbard ; Ellwanger et al . ). These basins are typically located distally to the corresponding catchment areas.…”

Section: Introductionmentioning

confidence: 97%

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High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

Burschil

Buness

Tanner

et al. 2018

Near Surface Geophysics

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Over‐deepened basins exist throughout the Alpine realm. Improving our knowledge on these basins is of high social relevance, since these areas are often well‐populated and they possess, for instance, unusual hydrological settings. Nonetheless, geophysical and sedimentological investigations of over‐deepened basins are rare. We analyse the sedimentary succession of such a basin, the Tannwald Basin, through geological interpretation of seismic reflection profiles. The basin is located approximately 60 km north of the European Alps. It was incised into Tertiary molasse sediments by the Rhine Glacier and later filled by glacial, fluvial, and lacustrine deposits of 250 m thickness. The Leibniz Institute for Applied Geophysics acquired a grid of five high‐resolution seismic reflection lines that imaged till the deepest parts of the Tannwald Basin. The seismic profiles, processed to a pre‐stack depth migration level, allow a detailed geological interpretation that is calibrated with the help of a nearby borehole. We determine the structure and the seismic facies of the sediment succession in the basin and presume the following hypothesis of the evolution of the basin: sub‐glacial erosion comprises the excavation of the over‐deepened basin as well as detachment of large fragments of molasse material. These molasse slabs were deposited within the basin in a layer of basal till that graded upwards in water‐lain till and fine‐grained deposits. During the last two glaciations, the basinal structure became buried by till sequences and glacio‐fluvial sediments.

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“…The formations are bound by unconformities, which are termed, from oldest to youngest, D3 to D1 (Table ; Ellwanger et al . ).…”

Section: Geological Settingmentioning

confidence: 97%

“…(a) Map of basins of the Rhine Glacier, modified after Ellwanger et al . (). The basins are generally younger and deeper towards a more proximal position with respect to the glacier.…”

Section: Geological Settingmentioning

confidence: 97%

“…In the Rhine Glacier area, Ellwanger et al . () differentiated three main formations based on lithostratigraphy (Fig. ).…”

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

Burschil

Buness

Tanner

et al. 2018

Near Surface Geophysics

Self Cite

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“…For a long time, the Quaternary stratigraphy of the northern Alpine Foreland had been correlated to that of southern Germany where the four units are attributed to the Günz, Mindel, Riss and Würm glaciations of Penck and Brückner (1909). According to this correlation, HDS was correlated with Günz, TDS with Mindel, HT with Riss and NT with Würm, respectively (e.g., Ellwanger et al 2011). This continued until Schlüchter (1988) presented a new stratigraphy based on the detailed field studies.…”

Section: Introductionmentioning

confidence: 99%

The first major incision of the Swiss Deckenschotter landscape

et al. 2014

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The Swiss Deckenschotter (''cover gravels'') is the oldest Quaternary units in the northern Swiss Alpine Foreland. They are a succession of glaciofluvial gravel layers intercalated with glacial and/or overbank deposits. This lithostratigraphic sequence is called Deckenschotter because it ''covers'' Molasse or Mesozoic bedrock and forms mesa-type hill-tops. Deckenschotter occurs both within and beyond the extent of the Last Glacial Maximum glaciers. The Swiss Deckenschotter consist of two subunits: Höhere (Higher) and Tiefere (Lower) Deckenschotter. Although the Höhere Deckenschotter sub-unit (HDS) is topographically higher than the Tiefere Deckenschotter, it is older. The only available age for the Swiss Deckenschotter is 2.5-1.8 Ma based on mammal remains found in HDS at the Irchel site. In this study, we present an exposure age for the topographically lowest HDS, calculated from a cosmogenic 10 Be depth-profile. Our results show that the first phase of the Deckenschotter glaciations in the Swiss Alps terminated at least 1,020 þ80 À120 ka ago, which is indicated by a significant fluvial incision. This line of evidence seems to be close to synchronous with the beginning of the Mid-Pleistocene Revolution, when the frequency of the glacial-interglacial cyclicity changed from 41 to 100 ka and the amplitude from low to high, between marine isotope stages 23 and 22.

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Kinematics of the Alpenrhein-Bodensee graben system in the Central Alps: Oligocene/Miocene transtension due to formation of the Western Alps arc

Ring

Gerdes

2016

Tectonics

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We report fault slip data from exhumed fault surfaces along the NNE trending Alpenrhein valley and its intersection with the WNW striking Bodensee Graben near the Alpine thrust front of the Central Alps in the Swiss-Austrian-German border region. This conjugated graben system straddles the boundary between the Alps and its foreland and allows comparing the kinematics of graben formation between the two different tectonic domains. Our data show sinistral transtension along the Alpenrhein Graben and dextral transtension along the Bodensee Graben. Both transtensional graben systems resulted from the same kinematic regime of NW directed shortening and NE oriented extension. The graben faults are not older than NW striking tear faults associated with NW directed Oligocene nappe emplacement in the Helvetics starting at 35-30 Ma and ending by 25-20 Ma. Compatible with this are six U-Pb ages of calcite fibers from four samples yielding consistent ages ranging from 25.3 ± 5.6 Ma to 21.8 ± 3.4 Ma (2σ errors). Earthquake data since 1996 show that kinematic directions persisted until the Recent. Our data broadly fit with the kinematic evolution of the Oberrhein Graben, which shows significant E-W extension in the Oligocene. We suggest that Oligocene extension in the Alps and its foreland resulted from the increased curvature of the Western Alps arc and associated moderate tangential stretching in the internal parts of the Central Alps. We discuss a tectonic model of eastward rollback of the west Mediterranean subduction zone associated with counterclockwise rotation of Adria, the latter of which aided the formation of the Western Alps arc. RING AND GERDES

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The Quaternary of the southwest German Alpine Foreland (Bodensee-Oberschwaben, Baden-Württemberg, Southwest Germany)

Cited by 36 publications

References 24 publications

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

The first major incision of the Swiss Deckenschotter landscape

Kinematics of the Alpenrhein-Bodensee graben system in the Central Alps: Oligocene/Miocene transtension due to formation of the Western Alps arc

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