Relationships between structural lineaments and Cenozoic volcanism, Tibesti swell, Saharan metacraton
Authors
Nkono, C.
Liégeois, J.P.
Demaiffe, D.
Discipline
Earth and related Environmental sciences
Subject
Geodynamics and mineral resources
Audience
Scientific
Date
2018Publisher
Elsevier
Metadata
Show full item recordDescription
This work reports an analysis of the relationships existing between the structural lineaments and the Cenozoic  volcanism of the Tibesti area (northern Chad). Shield volcanoes, cinder cones, structural lineaments, intersection  points of lineaments and faults are mapped using the combination of Shuttle Radar Topography Mission (SRTM),  Digital Elevation Models (DEMs) and Landsat satellite images of the Tibesti Volcanic Province.  The interpretation of the distribution of these structural and morphological features allows constraining the  structural/tectonic setting of the Tibesti. We show that the relationships between the lineaments and the volcanic  centres of the Tibesti province can locally be explained as the result of the combination of two Riedel  dextral tectonic systems, respectively oriented at N120°E and N30-35°E. Taking into account the geological  features of the area, a geodynamical model is proposed: the emplacement of the Tibesti Volcanic Province results  from the reactivation of inherited structures of the Saharan metacraton, characterized by relict rigid cratonic  nuclei and metacratonic areas reworked during the Pan-African orogeny, among which is located the Tibesti.  The contrasted behaviour of these rheologically different zones can explain the location and the evolution of the  Tibesti swell and volcanism. The new data presented in this paper and their interpretation in terms of the  emplacement of the Tibesti volcanic province in the Saharan metacraton bring a new and major information  about the behaviour of the African plate within its collisional context with Europe.
Citation
Nkono, C.; Liégeois, J.P.; Demaiffe, D. (2018). Relationships between structural lineaments and Cenozoic volcanism, Tibesti swell, Saharan metacraton. , Journal of African Earth Sciences, Vol. 145, 274-283, Elsevier, DOI: https://doi.org/10.1016/j.jafrearsci.2018.05.022.Identifiers
Type
Article
Peer-Review
Yes
Language
eng
