There has been considerable debate on the age of high-grade metamorphism in the Central Hoggar (Algeria). According to several authors, granulite facies metamorphism is of Paleoproterozoic age, while the Pan-African orogeny generated only greenschist and/or amphibolite-facies metamorphism. For others the high-grade metamorphism is Neoproterozoic. In an attempt to bracket the timing of deposition and metamorphism of the metasedimentary unit characterizing the Tamanrasset block (Central, Hoggar, Algeria), more than 200 zircon grains from metapelites have been investigated. Two varieties of zircons have been recognized according to the internal structure of the grains; the first population comprises cores of zoned zircon, which are considered as inherited. They display ages ranging from c. 2700 to c. 700 Ma. This wide range is related to multiple source provenances of the detrital grains. Furthermore, these cores reveal a high Th/U ratio. The second zircon population corresponds to metamorphic overgrowths that enclose the previous inherited cores besides new crystallized metamorphic zircon grains. The obtained results reveal that sediment deposition occurred after c. 700 Ma, and before the high-grade metamorphism which is well constrained to be at c. 660 (syn-collisional event) and c. 632 Ma (post-collisional event). The succession of mineral assemblages based on the microtexture observations along with the P-T pseudosections modeling suggest a clockwise P-T path with nearly isothermal decompression of the metapelites and garnet pyroxenites from the Tamanrasset block from pre-peak stage (M1) at 11.50 ± 1.0 kbar and 735 ± 50 °C to peak metamorphic stage (M2) at 10.25 ± 1.5 kbar and 820 ± 50 °C, and finally post-peak stage (M3) at 6.75 ± 1.0 kbar and 770 ± 50 °C conditions.