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Thilo Bechstädt (Info)
Rainer Zühlke (Info)
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+49 6221 54-8292
+49 6221 54-6055
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+49 6221 54-5503
Thilo Bechstädt (Info)
Rainer Zühlke (Info)
Phone
+49 6221 54-8292
+49 6221 54-6055
Fax
+49 6221 54-5503
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Upper Paleozoic Basin Evolution, Rügen Island, NE-Germany |
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| Abstract | ||
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| Scientists Hartmut Jäger, GeoResources and University of Heidelberg Paulo Fernandes, University of Faro, Portugal |
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| Abstract Until now the Lower Carboniferous of Rügen is interpreted as a typical carbonate platform, developed continuously from the Upper Devonian to the Lower Carboniferous at the margin of the Variscan foreland basin. The break up of this platform in the uppermost Visean led to the structural setting seen in seismic sections today. New studies of several boreholes from Rügen led to a strongly different model of the Lower Carboniferous depositional history, in the final phase of the Variscan orogeny. Palynostratigraphy shows significant stratigraphical gaps at the base and the top of the Lower Carboniferous. At the base the lower to middle Tournaisian is missing, linked to the major global regression at the Devonian/Carboniferous boundary, and at the top the middle to upper Visean is not preserved. The succession starts with typical platform carbonate deposits in the upper Tournaisian, followed by mainly resedimented carbonate deposits (carbonate debris flows, calciturbidites) throughout the Visean. Based on palynostratigraphic correlation and sedimentological analysis strongly diverging thickness per spore zone, sedimentation rates and processes just as differences in the overall stratigraphic range are observed in the different borehole sections. Major differences in subsidence are observed for each single block of Rügen, with rapid subsidence especially in the NE-part in the lower Visean followed by decreasing subsidence in the middle to upper Visean. The gradient of the subsidence increases from SW to NE, showing a northward dip of this intra-platform basin. Basin inversion led to uplift and erosion in the Upper Visean (to Lower Westphalian?) with a maximum in the NE-part, producing the large stratigraphical gap seen in these sections. This gives evidence for the collapse and break up of the platform around the Tournaisian/Visean boundary, leading to the development of an intra-platform basin in Rügen, similar to other intra-platform basins at this time in central and western Europe. For the quantification of this complex subsidence and uplift history a high resolution study of organic maturation (vitrinite reflectance) is done in selected boreholes. Erosional gaps will be quantified and the thermal history of the different blocks of this platform will be revealed. The stratigraphically and thermally controlled model of the evolution of the Lower Carboniferous carbonate platform from Rügen will be coupled with data from the variscan orogen, to analyse the interaction between the increasing crustal load due to the northward prograding orogenic front and increasing uplift within the foreland basin, especially along the margin, producing break up structures like the intra-platform of Rügen. |
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| Presentations & Publications GeoLeipzig 2004, Annual Meeting of German Geological Society, Leipzig, 2004. 15. International Conference of Carboniferous and Permian, Utrecht, 2003. |
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| Funding Organizations German Research Fund (DFG) |
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