Abstract

Concepts developed in the recently published model of the Aïr region (eastern Tuareg shield; Niger, Africa) as a college of three displaced terranes integrated in a single geodynamic model lead us to propose a terrane map of the Tuareg shield (500000 km2). The 23 terranes recognized have their own lithological, metamorphic, magmatic, and tectonic characteristics and are separated by subvertical strike-slip megashear zones that can be traced for hundreds of kilometres, or by major thrust fronts. Some of these boundaries have ophiolitic assemblages or molassic deposits. The Tuareg shield was shaped and partly accreted during the Pan-African orogeny (750-550 Ma), but not as a homogeneous body.

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