%0 Journal Article
%T Las sucesiones terr¨ªgenas del Tri¨¢sico superior y la base del Jur¨¢sico del Alto Muluya (Marruecos): estratigraf¨ªa y contexto geodin¨¢mico
%A Saadi
%A Z.
%A Fedan
%A B.
%A Laadila
%A M.
%A Azzouz
%A O.
%J Estudios Geologicos
%D 2012
%I Consejo Superior de Investigaciones Cient¨ªficas
%R 10.3989/egeol.40366.137
%X The Triassic-Jurassic basins of the High Moulouya area record the evolution of the Atlasicrifting in the SW-NE direction, showing a syntectonic continental sedimentation and an active volcanism. Such mobility has led to the differentiation of asymmetric half basins, whosegradual subsidence took place in successive stages. These basins, particularly during thedeposition of the terrigenous successions of the base of the Jurassic (early Liassic age),show a typical syntectonic continental infill. It consists of a mixed sedimentation, detrital andvolcanoclastic, generally coarse-grained towards the base. Coarser deposits, fed by volcanicclasts, are structured as sequences of spreading river cones, alternating with irregular clayfacies of flood plain. They reflect a rejuvenation of the relief, following a reactivation of thefaults. The sedimentary infill was provided by intermittent flows with considerable discharge,forming deposits along fault escarpments. The top of the terrigenous series shows a dominance of thin detritic sediments and a lack of volcanoclastics, reflecting the peneplanation ofthe relief and the creation of a flood plain. It records the widespread homogenization of theprior relief, causing the disappearance of the pre-existing structures during a period of tectonic quiescence. The volcanoclastics, witnessing an explosive volcanism and a concomitantsedimentation, are clustered in the tectonically active regions, where they are thicker and diversified. This late volcanism occurred during the final phases of rifting, owing to the replayof major Hercynian and tardi-hercynian faults. The Triassic-Jurassic period is thus marked byan extensional dynamics controlled by the influence of the first stages of the opening of thecentralAtlantic and the western Tethys Las cuencas tri¨¢sico-jur¨¢sicas del Alto Muluya han registrado la evoluci¨®n del proceso de ¡°rifting¡± que ocurri¨® en elAtlas: una apertura en la direcci¨®n SO-NE, una sedimentaci¨®n continental sintect¨®nica y un volcanismo activo. En este proceso se formaron cuencas a modo de sucesivos escalones asim¨¦tricos, que fueron hundi¨¦ndose a lo largo del tiempo. Estas cuencas, en especial durante la formaci¨®n de las series terr¨ªgenas (argilites salif¨¨res sup¨¦rieures en la literatura francesa de la regi¨®n: Michard, 1976; Kaoukaya, 1987) de la extrema base del Jur¨¢sico, muestran una organizaci¨®n t¨ªpica de relleno continental sintect¨®nico, con intercalaciones volcanosedimentarias y volcanocl¨¢sticas, generalmente con sedimentos gruesos hacia la base, progresivamente m¨¢s finos hacia el techo. El origen de esto
%K Morocco
%K Boumia-Tizi n'Rechou
%K latest Trias-earliest Jurassic
%K sedimentary dynamics
%K geodynamics
%K Marruecos
%K regi¨®n de Boumia-Tizi n¡¯Rechou
%K Tri¨¢sico superior-Jur¨¢sico basal
%K din¨¢mica sedimentaria
%K geodin¨¢mica
%U http://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/828/860