Evidence of Shock Metamorphism Effects in Suevite from the Triffa Plain in North Eastern Morocco

The Triffa plain is located in the north-eastern part of Morocco. It’s considered as sedimentary basin of a Quaternary age containing a wide variety of breccias that we consider as impactites. Thereby, we have found monomict breccia and polygenic breccia. The presence of glassy clasts allows us to determine the suevite that contains many indices of shock metamorphism. The effect of the shock is observed in quartz grains that show fractures and planar deformation, the mosaicism texture and ballen-quartz. The pebble breccia shows deformations of shock such as spallation fractures and striation. However, we suggest that the sediments in the Triffa depression are mainly impact breccias.