Abstract
Givetian subaqueous density-flow deposits reveal the existence of a peritidal carbonate platform in sedimentary basins preserved within the Rabat-Tiflet-Zone of Morocco. The calcareous component assemblage displays a photozoan carbonate production mode of the neritic source environments. Characteristic elements of the allochthonous faunal association are colonial tabulate corals, stromatoporoids, crinoids, bryozoans and thick-shelled brachiopods. Active growing reefs and cortoid sand shoals at the platform margin as well as periplatform carbonates at the uppermost slope settings contributed bioclastic and lithoclastic lime debris to the toe-of-slope of the carbonate apron. Bipartite cobble rudstone beds are interpreted as deposits of hyperconcentrated density flows, which cannot be maintained on very low-angle slopes for as long as more dilute flows and represent short run-out distances. Beds consisting of mostly well-organized pebbly grainstones, packstones and grainstone-wackestone couplets are deposits of surge-like concentrated flows and turbidity flows.
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Acknowledgements
The facial characterization of the Givetian succession at Tiflet was part of a project in which autochthonous and allochthonous structural units of Moroccan Central Massif were compared. The German Research Foundation (DFG) founded the project and made equipment available for field work in Morocco (Hu 804/1–1). We are particularly grateful to G.K.B. Alberti (University Hamburg), O.H. Walliser (University Göttingen) and T. Becker (University Münster) for supporting our preparations for field work. We are indebted to A. El Hassani (Institut Scientifique, Rabat) for scientific cooperation and logistic support and M. Boutaleb (Ministère de d’Energie et des Mines, Rabat) for issuing a working permit in Morocco. Special thanks are given to H. Weller (University Greifswald) for his helpful introduction to Devonian reef biota, and to S. Foley (University Mainz) for improving the English language of our manuscript. The critical reviews of an early version of the manuscript by M. Tucker (University Durham) and J. Martín-Chivelet (University Madrid) are gratefully appreciated and acknowledged. A. Freiwald and W. Buggisch (University Erlangen) are thanked for their constructive reviews.
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Hüneke, H., Krienke, K. Toe-of-slope deposits of a Givetian reef-rimmed platform: provenance of calcareous density-flow deposits (Rabat-Tiflet-Zone, Morocco). Facies 50, 327–346 (2004). https://doi.org/10.1007/s10347-004-0019-4
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DOI: https://doi.org/10.1007/s10347-004-0019-4