%0 Conference Proceedings %T Thermal evolution of early passive marginsformation and consequences on theirgeophysical signature %+ Institut für Geowissenschaften [Kiel] %+ Institute of Earth and Environmental Science [Potsdam] %+ Géosciences Rennes (GR) %A Bousquet, Romain %A Duesterhoeft, Erik %A Nalpas, Thierry %< avec comité de lecture %( RST 2016, livre des résumés %B 25 ème Réunion des sciences de la Terre (RST 2016) %C Caen, France %P 61 %8 2016-10-24 %D 2016 %K basin formation %K metamorphism %K geophysics %K tectonics %Z Sciences of the Universe [physics]/Earth Sciences/Tectonics %Z Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]Conference papers %X Many large-scale dynamic processes, from continental riftingto plate subduction, are intimately linked to metamorphic reactions.This close relation between geodynamic processes andmetamorphic reactions is, in spite of appearances, yet poorly understood.For example, during extension processes, rocks will beexposed to important temperature, pressures and stress changes.Meanwhile less attention has been paid to other important aspectsof the metamorphic processes. When reacting rocks expand andcontract, density and volume changes will set up in the surroundingmaterial.While several tectonic models are proposed to explain the formationof extensive basins and passive margins ( simple sheardetachment mantle exhumation .... ) a single thermal model(McKenzie, 1978), as a kind of dogma, is used to understandingand modeling the formation and evolution of sedimentary basins.The study of the thermal evolution, coupled with other tectonicmodels, and its consequences have never been studied in detail,although the differences may be significant. And it is clear thatthe petrological changes associated with changes in temperatureconditions, influence changes reliefs.Constrained by the new field data of north Pyrenean basins onthermal evolution of pre-rift and syn-rift sediments, we explorethe petrological changes associated to different thermal evolutionand the consequences on the subsidence of the basins. We willalso present numerical models quantifying mineralogical and physicalchanges inside the whole lithosphere during rifting processes.In the light of these models, we discuss the consequences of differentthermal evolution on the subsidence processes as well as ongravimetry and seismic velocities signature of passive margins. %G English %L insu-01387827 %U https://insu.hal.science/insu-01387827 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ GR-PPDB %~ UNIV-RENNES2 %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-P