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Interaction entre la tectonique salifère et la sédimentation dans des mini-bassins : Exemple de l'Oligo-Miocène du bassin de Sivas, Turquie.

Abstract : The aim of this thesis is to investigate the development of a salt-related mini-basin province, based on spatial and temporal changes in the facies assemblages, stratigraphic architecture and thicknesses, as well as stratal structures related to salt movement. The study area is the Sivas Basin, located in the Central Anatolian Plateau of Turkey, which is a foreland basin that records the formation during the Oligo-Miocene of numerous secondary mini-basins on top of an allochthonous evaporite canopy. Through detailed mapping of the Sivas mini-basin province, we provide a new and comprehensive description of the stratigraphic vertical succession including: - the Karayün Fm (Mid to upper Oligocene), comprising playa-lake, fluvial braided and fluvio-lacustrine deposits, and interpreted as a large distributive fluvial system; - the Karacaören Fm (Up. Oligocene to Low. Miocene), comprising two main sub-environments: mixed deltaic and carbonate ramp, alternating with coastal plain and restricted lagoon; - the Benlikaya Fm (Miocene), comprising alluvial fan, fluvial braided and playa-lake deposits interpreted also as a large distributive fluvial system; Within neighbouring minibasins and despite a similar vertical stratigraphic succession, variations are observed in stratigraphic units of equivalent age within and between minibasins. At the first order, we have defined three factors that dictate the pattern of mini-basin filling: - salt-induced accommodation producing local faciologic and stratigraphic thickness changes, and halokinetic structures along mini-basin borders. At larger scale, salt structures result in a compartmentalization of facies between basins. - The sediment supply rate, which affects facies assemblage and stratigraphic architecture. -Tectonically driven regional accommodation attributed to the foreland flexure, inducing the deposition of relatively isopachous series draping and finally obscuring the salt topography. In addition, this three factors are largely influenced by shortening during the evolution of the Sivas fold-and-thrust-belt.
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Submitted on : Monday, December 9, 2019 - 9:24:33 AM
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Charlotte Ribes. Interaction entre la tectonique salifère et la sédimentation dans des mini-bassins : Exemple de l'Oligo-Miocène du bassin de Sivas, Turquie.. Tectonique. Université de Pau et des Pays de l'Adour, 2015. Français. ⟨tel-02399326⟩



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