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Rheological-layered basin under strike-slip deformation: analogue approach at crustal scale

Abstract : In sedimentary basins, sediment type and deposit and burial conditions generate successivelayers with various rheologies reacting differently to boundary stresses. We used analoguemodelling to explore how a rheological-layered basin reacts to strike-slip displacements appliedto boundaries. Several experimental set-ups were tested by varying horizontal rheological layering(alternating viscous and cohesive layers) and displacement rates. All experiments generated a complexthree-dimensional deformation pattern localized into a narrow vertical band with thickened, thinnedand folded domains alternating along both strike and depth. This results in a succession of positiveand negative flower structures connected to the basal velocity discontinuity at depth and in a decouplingof deformation from one layer to another. Thinning and thickening variations display an alongstrikewavelength proportional to the layer thickness, an amplitude controlled by rheological layering,and in particular the strength contrast between each layer. The simultaneous genesis of shorteningand stretching structures during only one deformation stage is symptomatic of strike-slip boundaryconditions. These results indicate that caution should be exercised when postulating polyphaseddeformation fromoverprinting of different deformation styles.
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Olivier Dauteuil, C Homberg, M Rocher, M Amarouche, Jean-Jacques Kermarrec, et al.. Rheological-layered basin under strike-slip deformation: analogue approach at crustal scale. Comptes Rendus Géoscience, Elsevier Masson, 2020, 352 (3), pp.213-223. ⟨10.5802/crgeos.38⟩. ⟨insu-02983560⟩

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