Author/Authors :
berrada, ilyasse chouaib doukkali university - faculty of sciences - department of geology, El Jadida, Morocco , fekkak, abdelilah chouaib doukkali university - faculty of sciences - department of geology, El Jadida, Morocco , jouhari, abdellatif chouaib doukkali university - faculty of sciences - department of geology, El Jadida, Morocco , ezzouhairi, hassan chouaib doukkali university - faculty of sciences - department of geology, El Jadida, Morocco , ouanaimi, hassan cadi ayyad university - ecole normale supérieure - department of geology, Marrakech, Morocco , el houicha, mohamed chouaib doukkali university - faculty of sciences - department of geology, El Jadida, Morocco , el hadi, hassan hassan ii university - sciences faculty of ben msik - laboratory of geodynamics of old belts (lgca), Casablanca, Morocco
Abstract :
The Moroccan Variscan domain contains relics of the “Cambrian rift” developed from the Anti- Atlasic to the mesetian domain. Distinct volcanic activities, effusive and explosive, are related to this event, and are encased in the Cambrian deposits of the Western High Atlas from both sides of the Tizi-N-Test fault system. We have focused our work on a particular explosive volcanic conglomerate, referred here as V2 event. It’s Lan/Ybn ratios ( 8) and low ratios of Nb/Y ( 1), added to Nb, Ta and Ti-negative anomalies are comparable to the calc-alkaline orogenic rocks. The (Gd/Yb)_C ratios ( 2) confirm that the volcanic conglomerate V2 was generated by the melting of a deep garnet bearing mantle and would have inherited their orogenic signature from the partial melting of previously metasomatized mantle. The spatial extend of such volcanic rocks in different blocks of the Western High-Atlas supports their use it as a potential stratigraphic marker for the correlation of the Cambrian terranes deposited during this major extensive event.
NaturalLanguageKeyword :
Explosive Calc , alkaline volcanism , Early Cambrian , Western High Atlas , Cambrian rifting , Morocco
