%0 Conference Proceedings %T Impact of synkinematic sedimentationon the geometry and dynamics ofcompressive growth structures : Analoguemodelling insights %+ Institut de Physique du Globe de Paris (IPGP) %+ Géosciences Rennes (GR) %+ Systèmes Tectoniques %A Barrier, Laurie %A Nalpas, Thierry %A Gapais, Denis %A Proust, Jean-Noël %< avec comité de lecture %B 24 ème Réunion des sciences de la Terre 2014 %C Pau, France %3 24 ème Réunion des sciences de la terre 2014. Livre des résumés %P 214 %8 2014-10-27 %D 2014 %Z Sciences of the Universe [physics]/Earth SciencesConference papers %X Analogue sandbox models have been set up to study the impact of synkinematicdeposits on the geometry and evolution of single thrusts andfolds according to different sedimentation modes (a slow or rapid sedimentationrate that is constant or changing in space and time) and rheologicalprofiles (thin or thick sedimentary series, with a basal décollementlevel or not). A first series of experiments documents the influenceof synkinematic deposits according to their sedimentation rate and therheology of the prekinematic materials. A second series investigates theinfluence of changes in the sedimentation rate through time. A third oneconsiders the influence of changes in the sedimentation rate in space.All these experiments suggest that the geometry and evolution of singlecompressive growth structures vary according to the sedimentation rate.The number and dip of their frontal thrust segments change with the ratioR between the sedimentation rate (Vsed) at the footwall of the faultsand the uplift rate (Vupl) of their hanging wall. The latter is then more orless uplifted depending on the dip of the thrusts. As a result, the overallstructure has either a fault-bend fold or a fault-propagation fold geometry.Those rules are verified when the ratio R (Vsed/Vupl) changes inspace or through time. In addition, the rheological profile of the modelsalso affects the geometry and evolution of compressive growth structures.Their structural style, as well as the synsedimentary splitting andsteepening of the associated thrusts, varies according to the occurrenceand strength of the brittle and ductile layers.According to this modelling study, the ratio R (Vsed/Vupl) and itschanges in space and time, along with the rheology of the deformedmaterials, are key parameters to better understand the geometrical andkinematical complexities of natural growth thrusts and folds and to improvetheir interpretation. %G English %L insu-01080786 %U https://insu.hal.science/insu-01080786 %~ INSU %~ UNIV-PARIS7 %~ UNIV-RENNES1 %~ AFRIQ %~ UR2-HB %~ CNRS %~ IPGP %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ UR1-SDLMJONCH %~ GR-PPDB %~ GR-3T %~ UNIV-RENNES2 %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ SORBONNE-UNIVERSITE %~ INRAE %~ UNIV-PARIS %~ UR1-ENV %~ ALLIANCE-SU %~ GR-P