Journal
SEDIMENTARY GEOLOGY
Volume 344, Issue -, Pages 382-407Publisher
ELSEVIER
DOI: 10.1016/j.sedgeo.2016.01.023
Keywords
Soft sediment deformations; Convolute laminae; Load structures; Contained-reflected beds; Internal waves; Syntectonic sedimentation
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Funding
- Petrobras (Petroleo Brasileiro S.A.)
- ENI SpA.
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This work discusses the significance of particular types of soft-sediment deformations very common within turbidite deposits, namely convolute laminations and load structures. Detailed fades analyses of the foredeep turbidites in the Mamoso-arenacea Formation (northern Italy) and Annot Sandstones (south eastern France) show that these deformational structures tend to increase near morphological obstacles, concomitantly with contained-reflected beds. The lateral and vertical distribution of convolute laminae and load structures, as well as their geometry, has a well-defined depositional logic related to flow decelerations and reflections against bounding slopes. This evidence suggests an interaction between fine-grained sediment and the presence of morphologic relief, and impulsive and cyclic-wave loadings, which are produced by flow impacts or reflected bores and internal waves related to impinging bipartite turbidity currents. (C) 2016 Elsevier B.V. All rights reserved.
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