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Tectonosedimentary deformations and processes in semi-indurated marine sediments : the Permi-Triassic basins of Northern Europe (UK) and the intra-mountain basin of Tabernas (Spain)

Abstract : The aim is to study the sedimentary structures of deformation produced by liquefaction in subsurface of marine sediments (soft sediment deformations) during seismic events. A characterization of different levels of seismites is carried out in order to (1) establish links between the formation of SSDs and the regional tectonics with the time of destabilization using structural directions of deformation; (2) to discuss the impact of lithology on the shape and location of deformation structures in the sedimentary pile. The characterization of SSDs is realized from: (1) field observations and (2) statistical measurements of the direction of structures on objects of variable dimensions. The first studied case concerns the characterization of the SSDs that affect the Penarth group (Triassic-Jurassic boundary) deposits in the British Isles at the beginning of the break-up phase of the Pangea. The second example present the characterization of upstream areas of four major mass transport deposits, located in the intramontane basin of Tabernas, in the Betic Cordilleras (Spain). Sediment lithology and induration rates with depth, have a strong impact on the type of observed deformation structures. The parameters that encourage the triggering of the gravity destabilization above a liquefied level are (1) a low sedimentary induration rate which does not limit the liquefaction process (2) a high liquefaction duration which requires a high magnitude of the seismic event (3) the absence of faults which cross the liquefied level and can anchor the deformation in the underlying bed by forming relief.
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Submitted on : Thursday, December 13, 2018 - 3:06:34 PM
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  • HAL Id : tel-01900947, version 2

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Marine Laborde-Casadaban. Tectonosedimentary deformations and processes in semi-indurated marine sediments : the Permi-Triassic basins of Northern Europe (UK) and the intra-mountain basin of Tabernas (Spain). Earth Sciences. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066563⟩. ⟨tel-01900947v2⟩

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