In Petite Kabylie Massif of eastern Algeria, two superposed high grade tectono-metamorphic (DJ-Ml) events have been recognized and investigated in two distinct crystallines units : upper crystalline units and lower crystallince units, named Beni Fergucnc units.

The first one event studied in upper units is associated with high temperature (HT) and Low pressure (LP) metamorphism (P= 4kb, T= 725°C) and is synchroneous of granite emplacement dated at 274± 6Ma (U-Pb or zircon). The east sharing is associated with granite emplacement developed during decompression. Final retrograde evolution corresponding to decompression cooling following this granite emplacement is associated with extensional shear zones.

The second high grade deformational (D2-M2) event (P = 9 – 10 Kb, T = 550 – 650°C) affects mainly lower crystalline units and corresponds to the northward shearing. Previous assemblages (M1) arc transformed as andalousite by kyanite in metapelites and muscovite by secondary white mica and kyanite in metagranites (High pressure assemblages (M2). In these lower units, the HP event clearly involved 270 – 280 Ma old granites.

Field observations, petrological, structural and radiometric data led to suggest that (D2-M2) tectono-metamorphic event overprinted LP variscan basement before upper Eocene deformation. Thus, late hercynian or eoalpin ages for this HP event is debated in this study.