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Geological Society, London, Special Publications; 1984; v. 15; p. 223-241;
DOI: 10.1144/GSL.SP.1984.015.01.15
© 1984 Geological Society of London

Carbonate Turbidites and Associated Facies

Depositional model for calcilutites: Scaglia Rossa limestones, Umbro-Marchean Apennines

D. A. V. Stow, S. C. R. Rainey & G. Angell

Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, Scotland

F. C. Wezel & D. Savelli

Istituto di Geologia dell’Università di Urbino, Urbino 61029, Italy

The calcilutites of the mid-Cretaceous to uppermost Eocene Scaglia Rossa Formation in Italy have previously been interpreted as a continuous sequence of slowly deposited pelagic limestones. However, regional considerations of thickness, sedimentation rates and facies distribution, together with detailed analysis of composition, texture and sedimentary structures suggest that turbidity currents have played an important part in the deposition of, at least, the middle (Maastrichtian) member. Turbiditic calcilutites are very fine-grained and massive, whereas the pelagites are coarser-grained, mottled and bioturbated. There is, however, a continuous gradation of facies and processes between these two end-members, that we believe is applicable to many other modern and ancient deep-water carbonate systems. The common overlap of turbiditic and pelagic processes in fine-grained ‘pure’ carbonates arises partly from their relative lack of flocculation compared with muddier sediments.





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