Evidence of Resedimentation in Chalk from the Central Graben, North Sea
R. A. Schatzinger, C. T. Feazel, W. E. Henry, 1985. "Evidence of Resedimentation in Chalk from the Central Graben, North Sea", Deep-Water Carbonates: Buildups, Turbidites, Debris Flows and Chalks—A Core Workshop, Paul D. Crevello, Paul M. Harris
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The slow rain of pelagic skeletons to the sea floor is not the depositional event commonly recorded in North Sea chalk. Cores from the Central Graben reveal a spectrum of resedimentation features interpreted as the products of slumps, debris flows, and turbidity currents. Evidence for reworking includes mixed faunas from discrete environments, intermingled biostratigraphic zones, chalk clasts, contorted bedding, calcarenite, synsedimentary microfaults and fractures, and the absence of bioturbation. Recognition of allochthonous intervals and interpretation of the mechanisms responsible are important to problems of correlation, reservoir geometry, and engineering properties.
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Deep-water carbonates represent on the few frontiers remaining for carbonate exploration and research. The last decade has experienced a rapid evolution in concepts of depositional models and diagenesis which underscores the importance of these deposits as significant reservoirs and source rocks. This workshop displayed cores selected to provide subsurface geologic examples of deepwater carbonates from a variety of depositional settings. Several papers discuss depositional models, platform-to-basin reconstructions, and diagenetic sequences that are important in the development and exploration of Paleozoic carbonate debris flow and turbidite reservoirs of the Palo Duro, Delaware and Midland Basins. Many other examples are included from several different regions.