Late Panafrican evolution of the main Hoggar fault zones: Implications of magnetic fabric study in the In Telloukh pluton (Tin Serririne basin, Algeria) |
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| Authors: | Bernard Henry Boualem Bayou Mohamed EM Derder Hamou Djellit Aziouz Ouabadi Allaoua Khaldi Abderahmane Hemmi |
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| Institution: | aPaléomagnétisme, IPGP and CNRS, 4 Avenue de Neptune, 94107 Saint-Maur cedex, France;bCRAAG, BP 63, 16340 Bouzaréah, Alger, Algeria;cFSTGAT/USTHB, BP 32, El-Alia Bab Ezzouar, 16111 Alger, Algeria;dCRND, BP 43, Sebala, Draria, Algeria |
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| Abstract: | The Late Panafrican evolution of the Hoggar shield is characterized by emplacement of magmatic intrusions and by occurrence of major shear zones separating different terranes. In Telloukh granite is close to the In Guezzam faults (western border of the Tin Serririne basin). Analysis of its visible and magnetic fabrics suggests an emplacement mode and deformation that are not related to the In Guezzam faults, but most likely to a N–S compression, an event not yet identified. Dioritic dykes crosscutting the granite have a very different magnetic fabric, which is related on the contrary to dextral strike-slip movements along the In Guezzam faults. In both cases, no visible fabric can be correlated with the magnetic fabric, which has been likely acquired during late magmatic stages. This magnetic fabric was not significantly affected by the tectonic events that took place after entire crystallization of the magma. The In Guezzam faults and the major 7°30 and 4°50 shear zones are close to intrusions such as In Telloukh dykes and the Alous En Tides and Tesnou plutons where quite similar magnetic fabrics are observed, all related with dextral strike-slip movements along these structures. |
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| Keywords: | Magnetic fabric Granite Panafrican Fault zones Hoggar shield |
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