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Structural parameters of the dyke swarm in the Saghro Massif (Eastern Anti-Atlas, Morocco): Insights into the understanding the depth of magma chamber source and tectonic regime during emplacement

Ahmed Baamar 1,3, Ezzoura Errami2, Brahim Karaoui3, Zakarya Yajioui3, John Browning4

  • Affiliations: 1Faculty of Sciences Semlalia, Cadi Ayyad University, B.P. 2390, 40000 Marrakech, Morocco; 2Department of Geology, Faculty of Sciences, Chouaib Doukkali University, BP. 20, 24000 El Jadida, Morocco; 3Applied Geology Laboratory, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, P.O. Box 509 Errachidia, Morocco; 4Department of Structural and Geotechnical Engineering. Pontificia Universidad Catolica de Chile. Avenida Vicuna Mackenna 4860, Macul, Santiago, Chile

  • Presentation type: Poster

  • Presentation time: Monday 16:30 - 18:30, Room Poster Hall

  • Poster Board Number: 125

  • Programme No: 3.1.17

  • Theme 3 > Session 1

Abstract

The Ediacaran Saghro Massif, in the eastern Anti-Atlas of Morocco, hosts extensive dyke swarms that intrude formations of the Saghro Group and the Ouarzazate Supergroup. This study investigates a dyke swarm in the central part of the massif to constrain the depth of the magma chamber source and the tectonic regime active during emplacement. A total of seventy-eight dykes were analyzed in terms of orientation, thickness, length, and geometric characteristics. The depth of the magma chamber was estimated by evaluating dyke aspect ratios and magma overpressure, incorporating parameters such as the elastic properties and density of the host rock, magma density, gravitational acceleration, and Poisson's ratio. Additionally, paleo-stress analysis was conducted to reconstruct the prevailing tectonic conditions. The findings suggest that these dykes originated from a deep-seated magma reservoir, likely near the Moho discontinuity. Paleo-stress reconstruction indicates that their emplacement occurred under a transtensive tectonic regime linked to the WACadomian orogeny. Keywords: Morocco, Eastern Anti-Atlas, Saghro Massif, dyke swarm, magma overpressure, magma chamber depth, transtensive regime.