%0 Conference Proceedings %F Poster %T THE BEGINNING OF MESOZOIC SEDIMENTATION OF THE NORTHAND EAST OF FRANCE: PALAEOENVIRONMENTALRECONSTRUCTIONS AND IMPLICATIONS ON GEODYNAMICEVOLUTION OF THE TRIASSIC IN NW EUROPE %+ Géosciences Rennes (GR) %A Bourquin, Sylvie %A Le Carlier de Veslud, Christian %A Durand, Marc %< avec comité de lecture %B International Meeting of Sedimentology 2017 %C Toulouse, France %3 Abstract book %P 126 %8 2017-10-10 %D 2017 %Z Sciences of the Universe [physics]/Earth Sciences/Stratigraphy %Z Sciences of the Universe [physics]/Earth Sciences/TectonicsConference poster %X The beginnings of Mesozoic sedimentation in north and east of France are located in three presentdayareas: the Paris Basin, the Rhine Graben and the Bresse-Jura Basin. If the relations between Paris and Germanbasins are exposed in recent papers, especially for the Early Triassic, the relation with BresseJura Basin is lessunderstood even it is considered as a sub-basin connected with German and Paris Basin.The aim of this paper is, from new data and correlations in the northern part of France, (1) to reconstructisopach and palaeogeographic maps, and (2) to discuss the geodynamic evolution of the north-west Europeandomain during the Triassic.The Triassic series mainly crop out in the eastern part of France and only well-log data can provide acontinuous record. By studying outcrops, core data and a complete set of wells, we can carry out correlationsof the Triassic series between basement and Early Jurassic deposits. Around 600 wells are correlated using theprinciples of high-resolution sequence stratigraphy to establish the 2-D and 3-D geometries. The use ofgeomodeller Gocad allow to produce palaeogeographic and isopach maps.At the scale of the whole study area, an unconformity is observed between Permian and Triassic systems.Mesozoic sedimentation began during the Olenekian; the ephemeral fluvial systems indicate warm and aridclimatic conditions. At the top of the Lower Triassic series, another tectonically induced unconformity isobserved: the Hardegsen unconformity, which is intra-Spathian in age. That leads to the development of a newsedimentation area to the west. This tectonic activity creates new source areas and a new fluvial style, withmarine influences at the distal part of the systems. Both during the end of the Olenekian and the Anisian, thepresence of palaeosols, micro-and macrofloras indicates less warm conditions throughout the region. Duringthe Anisian and Ladinian, continental sedimentation is characterized by a retrogradational trend. In otherwords, the fluvial system evolves towards fluvio-marine environments, attesting to a direct influence of theTethys Ocean in the eastern domain. The maximum flooding episode is Ladinian and corresponds to wellextendMuschelkalk facies to the west. The progradational trend is characterized by evaporite sedimentationin the eastern domain and alluvial fan deposits in the western part. The sediment supply comes from theArmorican Massif and the climate conditions are warm and humid. The sedimentation is controlled by faultscreating subsiding areas where salt series are preserved. During the Middle Carnian, the climate becomes morehumid, without evaporite and the fluvial systems come from the north. This episode marks the beginning of anew retrogradational cycle that end in Early Jurassic. After this humid episode, more warm conditions occurwith evaporite deposits and alluvial fan sediments preserved only in the western part. An intra-Norianunconformity, i.e. Early Cimmerian unconformity, allows the separation of two basins, i.e. the Paris Basin andBresse-Jura Basin. Above the unconformity, an acceleration of the retrogradational trend occurs with transitionfrom dolomitic sebkha, to marine Rhaetian sandstone and then to Liassic limestones. %G English %L insu-01718002 %U https://insu.hal.science/insu-01718002 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ GIP-BE %~ UR1-HAL %~ UR1-SDLM %~ GR-PPDB %~ UNIV-RENNES2 %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-P %~ GR-DEMO %~ TEST3-HALCNRS %~ TEST4-HALCNRS %~ TEST5-HALCNRS