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lithosphère océanique peut subir des fracturations -)formation de failles normales parallèles --)s'incurvent jusqu'au manteau (failles listriques )---)favorise la mise en place de blocs----)s'effondrent et basculent au fur à mesure de l'expansion = phase de rift continentale fossé d'effondrement bordé de blocs basculés --) amincissement de la croûte et l'exhumation du manteau---) roche mantellique , hydraté et décompressé , subit fusion partielle de la croute continentale et de la croute océanique =Accrétion océanique Bordures des océans = marges passives-) zone de transition entre la croute continentale et croute océanique Sédiments se déposent --) enregistre l'activité tectonique , l'enfoncement progressif et l'expansion de l'océan1) sédiments issus de l'érosion des flancs du rift et des éclogites 2)sédiments d'eau (calcaires , argilites ...)Sédiment avant l'effondrement : sédiment ante rift

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