Skip to Main Content
Book Chapter

Lithospheric structure of the Atakor metacratonic volcanic swell (Hoggar, Tuareg Shield, southern Algeria): Electrical constraints from magnetotelluric data

By
Abderrezak Bouzid
Abderrezak Bouzid
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Boualem Bayou
Boualem Bayou
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Jean-Paul Liégeois
Jean-Paul Liégeois
Geodynamics and Mineral Resources, Royal Museum for Central Africa, B-3080 Tervuren, Belgium
Search for other works by this author on:
Seid Bourouis
Seid Bourouis
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Sofiane Saïd Bougchiche
Sofiane Saïd Bougchiche
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Abdelhamid Bendekken
Abdelhamid Bendekken
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Abdeslam Abtout
Abdeslam Abtout
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Walid Boukhlouf
Walid Boukhlouf
CRAAG, Route de l'Observatoire, BP 63, Bouzaréah, 16340 Algiers, Algeria
Search for other works by this author on:
Aziouz Ouabadi
Aziouz Ouabadi
Laboratoire de Géodynamique, Géologie de l'Ingénieur et Planétologie, FSTGAT/USTHB, BP 32, El-Alia Bab Ezzouar, 16111 Algiers, Algeria
Search for other works by this author on:
Published:
October 01, 2015

The Tuareg Shield, to which Hoggar (southern Algeria) belongs, has a swell-shaped morphology of lithospheric scale of ~1000 km in diameter linked to Cenozoic volcanism occurring in several regions, including Atakor, the center of the swell, which reaches nearly 3000 m in altitude. The lack of high-resolution geophysical data for constraining its deep structure is at the origin of a controversy about its innermost nature and about the origin of the Cenozoic volcanism. During the course of this study, magnetotelluric (MT) broadband data were collected at 18 sites forming a northeast-southwest profile 170 km long within the Atakor region. The electrical resistivity model obtained by inverting the magnetotelluric data reveals lithospheric structure down to a depth of ~100 km. From this depth to the surface, the model does not show any regional anomaly that may result from a metasomatized lithosphere or from an asthenospheric upwelling, including a mantle plume. MT data reveal rather a lithosphere affected by a set of rather thin subvertical conductors that can be attributed to the electrical signature of some known shear zones resulting from the Pan-African evolution of the LATEA metacraton, which globally corresponds to the uplifted Central Hoggar swell. The main anomaly is deeply rooted in the lithosphere and underlies the Atakor-Manzaz volcanic districts. As a whole, MT data are therefore properly integrated within the hypothesis of the reactivation of shear zones due the intraplate deformation related to the collision between Africa and Europe since the Eocene, applied onto the metacratonic region.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Special Papers

The Interdisciplinary Earth: A Volume in Honor of Don L. Anderson

Gillian R. Foulger
Gillian R. Foulger
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
Search for other works by this author on:
Michele Lustrino
Michele Lustrino
Dipartimento di Scienze della Terra, Universita` degli Studi di Roma La Sapienza, P.le A. Moro, 5, 00185 Roma, Italy
Search for other works by this author on:
Scott D. King
Scott D. King
Department of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, USA
Search for other works by this author on:
Geological Society of America
Volume
514
ISBN print:
9780813725147
Publication date:
October 01, 2015

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Articles
Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal