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An Overview of the Plutons Magnetic Fabric Studies in the Hoggar Shield: Evolution of the Major Shear Zones During the Pan-African

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Abstract

The magnetic fabric obtained in the Hoggar shield on several plutons is related to various origins: simple flow, syn-deformation flow, stress field during late-magmatic stage and solid-state deformation. These results also evidenced the important role of hosting frame, acting as a more or less efficient “protection” against the effects on the magnetic fabric of the regional stress field. Combined studies, on neighboring sites of the main intrusion and of late-magmatic dykes crosscutting it, yield key-arguments about the acquisition age of this fabric. P′(Km) diagrams clearly highlight the strain gradient in plutons very close to shear zones. The fact that K1 axis is mainly a mineral lineation, at least in three plutons, is evidenced by the determination of the magnetic zone axis. The plutons AMS is associated with different Pan-African stages in the Hoggar: gneissification of Eburnean plutons, syn-thrust pluton emplacement, pluton emplacement under regional shearing context. Accordingly, the main movements along the major shear zones, related to the oblique collision of the Hoggar shield with the West African Craton, are contemporaneous of the first stages. Shearing context during the following period points out that this collision had still active effects, probably associated with a progressive change in orientation of the continental convergence.

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Acknowledgements

We are very grateful to the civil and military authorities at Tamanrasset and Djanet, to the “Office de la Recherche Géologique et Minière” (ORGM) at Tamanrasset, to the “Office du Parc National de l’Ahaggar” (OPNA) and the “Office National du Parc Culturel du Tassili N’ajjer”—ONPCTA for help during our field works. Thanks also to all people who helped us on the field, particularly H. Djellit, D. Belhai, A. Khaldi, A. Hemmi and M. Ayache. Special thanks also to all our drivers. Contributions of J. P. Liégeois and O. Bruguier were fundamental for the studies in the eastern Hoggar. J. P. Liégeois is also thanked for very constructive review.

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Authors and Affiliations

  1. Paléomagnétisme, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ. Paris Diderot and UMR 7154 CNRS, 4 Avenue de Neptune, Saint-Maur Cedex, 94107, France

    B. Henry

  2. CRAAG, B.P. 63, Bouzaréah, Alger, 16340, Algeria

    M. E. M. Derder, S. Maouche, O. Nouar, M. Amenna & B. Bayou

  3. Laboratoire “Géodynamique, Géologie de l’Ingénieur et Planétologie”, FSTGAT USTHB, BP 32, El-Alia Bab Ezzouar, Alger, 16111, Algeria

    A. Ouabadi

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Correspondence to B. Henry .

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Editors and Affiliations

  1. University of Science and Technology Houari Boumediene, Algiers, Algeria

    Abderrahmane Bendaoud

  2. Department of Geology, Benha University, Benha, Egypt

    Zakaria Hamimi

  3. Faculty of Earth Sciences, University of Science and Technology Houari Boumediene, Algiers, Algeria

    Mohamed Hamoudi

  4. Faculty of Earth Sciences, University of Science and Technology Houari Boumediene, Algiers, Algeria

    Safouane Djemai

  5. Department of Geology, Benha University, Benha, Egypt

    Basem Zoheir

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Henry, B. et al. (2019). An Overview of the Plutons Magnetic Fabric Studies in the Hoggar Shield: Evolution of the Major Shear Zones During the Pan-African. In: Bendaoud, A., Hamimi, Z., Hamoudi, M., Djemai, S., Zoheir, B. (eds) The Geology of the Arab World---An Overview. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-319-96794-3_4

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