Abstract
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.
Highlights
Erosion, deformation or burial frequently prevent from the recognition of large impact craters on Earth
In this work we will focus on the breccias in the Triffa plain which are interpreted in literature as a depression filled with the Quaternary sediment deposits
We report observations and descriptions of the breccias which contain indications of shock that prove that the Triffa basin may have been formed by the shock of meteorite impact
Summary
Deformation or burial frequently prevent from the recognition of large impact craters on Earth. Identified impact structures on the Earth’s surface are first marked by a circular or near-circular form, such as a topographic surface or a circular geophysical anomaly [1]. These features may help to detect a new impact crater. The mountain chains surrounding the Triffa plain show no circular structure that may be attributable to the impact crater. In this work we will focus on the breccias in the Triffa plain which are interpreted in literature as a depression filled with the Quaternary sediment deposits. We report observations and descriptions of the breccias which contain indications of shock that prove that the Triffa basin may have been formed by the shock of meteorite impact
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