β Scribed by P. Barbey; F. Oberli; J.-P. Burg; H. Nachit; J. Pons; M. Meier
No coin nor oath required. For personal study only.
Zircon U-Pb data on post-tectonic granites that have intruded the Precambrian formations of the Kerdous inlier (western Anti-Atlas, Morocco) are Pan-African. Zircon grains from a syntectonic monzodiorite of the Tahala pluton yield a precise discordia line with an upper intercept at 2043.9 Β± 1.8 Ma (MSWD = 0.67) interpreted as the emplacement age. This age is consistent with zircon U-Pb ages of granites from other inliers and confirms the existence of a widespread magmatic event at %2045 Ma in the Anti-Atlas. The Pan-African event left no resolvable imprint on the isotopic systems of the analysed zircons. The Kerdous Schists are, therefore, older than 2045 Ma. Rb-Sr and Sm-Nd data on the schists and the Tahala pluton suggest that both juvenile and Archaean material contributed to the generation of the Palaeoproterozoic formations in the Anti-Atlas.
π SIMILAR VOLUMES
Four events have been identified in the Tagragra dΓAkka and Tafeltast-Kerdous inliers: (i) a middle Palaeoproterozoic (Orosirian, ca. 2.047 Ga) event corresponding to the emplacement of calc-alkaline and peraluminous granites containing older inherited zircon (2.07-2.15 Ga), (ii) an upper Palaeoprot
New geological investigations and geochronological data from the Kerdous inlier of the Moroccan Anti-Atlas suggest that an extensional event is recorded by stratigraphic and tectonic features within the Late Proterozoic-Early Cambrian cover. The Tasrirt massif is interpreted as a Late Proterozoic di
The lower Cryogenian mafic magmatism from the Igherm, Ifni and Kerdous inliers (Moroccan Western Anti-Atlas) have calc-alkaline, tholeiitic and alkaline affinities. The calc-alkaline dolerite dykes and gabbros bodies emplaced before the conglomeratic formations of the Upper Cryogenian and after the