Abstract
The main results of structural and geochronological investigations carried out in the Central part of the Hoggar: • — confirm the existence and the great extent of a basement of Eburnean age (ca. 2000 m.y.); • — indicate the existence of a Kibaran orogeny; • — and show a minimal Pan-African imprint upon gneisses and migmatites underlying the Hoggar East of the major NW—SE fault running from Amguid to the western edge of the Air; the eastern limit of this domain has still to be defined. These results are discussed in the setting of available geochronological data concerning the whole Hoggar and an attempt is made to define structural domains within the shield. A picture of the internal constitution of this segment of the Pan-African mobile belt is proposed.
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