Crustal to Microscale Strain Partitioning during Transpression and Control on Ore Formation: Insights from the Paleoproterozoic Séguéla Shear Zone, Southern West African Craton

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Published: Oct 20, 2025
DOI: https://doi.org/10.55575/tektonika2025.3.2.108
Keywords:
Transpression Strain partitioning Multi-scale approach Structural control on mineralisation

Main Article Content

Julien Perret
Centre for Exploration Targeting, School of Earth and Oceans, University of Western Australia, Crawley, WA 6009, Australia
https://orcid.org/0000-0003-0579-1449
Nicolas Thébaud
Centre for Exploration Targeting, School of Earth and Oceans, University of Western Australia, Crawley, WA 6009, Australia
https://orcid.org/0000-0003-2167-7398
Denis Fougerouse
School of Earth and Planetary Sciences, Curtin University, Bentley, WA 6102, Australia
https://orcid.org/0000-0003-3346-1121
Crystal Brochard
Brunswick Exploration, Montreal, Quebec H3B 2S2, Canada
https://orcid.org/0000-0002-7047-2826
Patrick C. Hayman
School of Earth and Atmospheric Sciences, Queensland University of Technology, Brisbane, QLD 4000, Australia
https://orcid.org/0000-0001-7682-9868
Mark W. Jessell
Centre for Exploration Targeting, School of Earth and Oceans, University of Western Australia, Crawley, WA 6009, Australia
https://orcid.org/0000-0002-0375-7311

Abstract

Crustal-scale transpressional shear zones provide critical insights into regional tectonics during oblique convergence and frequently host significant ore deposits. However, deciphering their evolution remains challenging due to complex interactions between orientation relative to the finite shortening, structural inheritance and strain partitioning, that influence their localisation, geometry, and kinematics. Following an integrated field-to-laboratory approach, this study investigates the record of transpressional tectonics and controls on mineralisation in the gold-endowed, north-striking Séguéla shear zone located in north-western Côte d’Ivoire, within the Paleoproterozoic Baoulé-Mossi domain, southern West African craton. The Séguéla shear zone evolved during a progressive D1Seg-D2Seg deformation phase associated with northwest-trending oblique convergence. D1Seg likely records the Eburnean Tectonic Event (ca. 2135 to 2020-2095 Ma) culminating in craton assembly, whereas the main D2Seg stage reflects late Eburnean (ca. 2095-2060 Ma) transcurrent tectonics.  D1Seg eastward-directed thrusting remnants persist in low-strain domains but were overprinted by high-strain, first-order north-striking shears and second-order northeast-striking structures formed during pure shear-dominated D2Seg transpression. Pre-existing northeast-striking fabrics likely facilitated strain localisation, although their timing and exact role in the docking of the craton remain uncertain. Quartz microtextures indicate elevated strain intensity and/or longer-lived deformation within mineralised veins formed along first-order shear structures, contrasting with transient, possibly weaker deformation and enhanced thermal or strain relaxation recorded in second-order structures. Finally, strain partitioning across the Séguéla shear zone controls the distribution, tonnage and grade of gold deposits along first- and second-order structures, as well as ore-shoot orientation. This case study therefore highlights how integrating multiscale evidence unravels strain partitioning in transpressional systems, improving our understanding of deformation processes and their control on mineralisation.

Article Details

How to Cite
Perret, J., Thébaud, N., Fougerouse, D., Brochard, C., Hayman, P. C., & Jessell, M. W. (2025). Crustal to Microscale Strain Partitioning during Transpression and Control on Ore Formation: Insights from the Paleoproterozoic Séguéla Shear Zone, Southern West African Craton. τeκτoniκa, 3(2), 127–154. https://doi.org/10.55575/tektonika2025.3.2.108
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Vol. 3 No. 2 (2025)
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Articles
Author Biography

Julien Perret, Centre for Exploration Targeting, School of Earth and Oceans, University of Western Australia, Crawley, WA 6009, Australia

I am currently a Research Associate at the Centre for Exploration Targeting, University of Western Australia, Perth, within the framework of the West African eXploration Initiative - stage 4. The programme aims to further the accomplishments of earlier stages related to deciphering the formation of mineral systems, not only in the Paleoproterozoic domain but also in the neighbouring Archean domain of the West African craton. My primary focus is on characterising crustal- to deposit-scale tectonics favourable to gold mineralisation through GIS-assisted field mapping, core logging, and GIS-based terrane analysis. Upper-scale integration relies on the analysis of microscopic petrographic-structural-textural relationships and in situ geochemical and geochronological analyses of ore and ore-related accessory minerals using pioneering laboratory techniques. Previously, I was an engineer geologist at MICA Environnement, working in the fields of natural hazard monitoring, earthworks, quarrying, and mining. Prior to that, I worked as a junior geologist at Arethuse Geology (May 2018 - September 2021) and completed a PhD in June 2021, in collaboration with the GeoRessources research centre, University of Lorraine, Nancy, France. My PhD project addressed the spatial and temporal distribution of the Pan-African gold mineral system in the Arabian Nubian Shield by conducting a multi-scale study along the Keraf Suture, NE Sudan. It was co-supervised by Anne-Sylvie André-Mayer (GeoRessources, University of Lorraine), Aurélien Eglinger (GeoRessources, University of Lorraine), and Julien Feneyrol (Arethuse Geology).
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