Nguyen Cong, Nghia (2007) Restauration des propriétés mécaniques originelles des sédiments repris en glissements synsédimentaires (slumping). PhD thesis Dynamique et ressources des bassins sédimentaires, Centre de Géosciences, ENSMP p.242.

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Abstract

The sedimentary modification in form of synsedimentary slumping is a witness of long-term geodynamic evolution of a sedimentary basin. This study of the Vocontian Basin (South-East of France), in paleogeographic context of submarine valley, tried to highlight the role of the initial properties of sediment in the phenomenon of submarine sliding. Main part of accomplished works concerns limestone-marl alternations and their modifications (slumps) during Hauterivian, particularly in the region of Serres. The biostratigraphy of slumps was accomplished due to the abundance of ammonites. To characterize the original lithology of the slice affected by sliding, a representative composite section was constructed from different sections exempt from slumps. The correlation between this composite and the section of Serres-Montclus, followed by an interpretation at time, allowed to differentiate on one hand two types of the slided material (very marly alternation and alternation rich in limestone), and on the other hand to suggest that climatic changes cause a indirect condition favourable to the generation of slidings (cycles of Milankovitch). The heterogeneity of the slided mass and internal structures in slumps underlined a mechanism of disintegration by shearing in marly layers. However, the presence of intact blocks testifies an incomplete disintegration. An initial configuration of the affected slice was restored by a decompaction. Basic elements for a geomechanic modelling of the behaviour of a heterogeneous massif with limestone-marl alternation, were set up ...

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