Abstract
The southern part of the West African Craton includes the Baoulé-Mossi Domain, the world’s premier Paleoproterozoic gold province (~10,000 metric ton gold endowment). Structural, metamorphic, and geochronological data suggest gold mineralisation occurred during three episodes that span much of the Eoeburnean and Eburnean orogenic cycles. Eoeburnean orogenic and rare skarn-hosted gold deposits formed between ca. 2200 and 2135 Ma during repeated episodes of volcanism, plutonism, and shortening, which thickened the Paleoproterozoic crust. Early Eburnean orogenic and placer gold deposits formed between ca. 2110 and 2095 Ma during inversion, metamorphism, and subsequent oblique shortening of intra-orogenic basins filled after ca. 2135 Ma. This episode of mineralisation terminated when the Baoulé-Mossi Domain docked with the Archean Kénéma-Man Domain at ca. 2095 Ma. Late Eburnean orogenic and less common intrusion-related gold deposits formed between ca. 2095 and 2060 Ma during strike-slip to oblique-slip tectonics, post-collisional high-K plutonism and crustal reworking across the western and southern Baoulé-Mossi Domain. Eoeburnean gold deposits include ca. 10 % of the gold endowment of the Baoulé-Mossi Domain, whereas the Early Eburnean and Late Eburnean deposits include ca. 50–70% and 20–40%, respectively. Here, we highlight the favourable confluence of accretion-collision tectonics, involving juvenile crust formation as well as protracted magmatic, metamorphic, and deformation histories that resulted in diachronous gold events spread over at least 100 myr throughout the Baoulé-Mossi Domain.
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Acknowledgements
AMIRA International, the industry sponsors, and sponsors in kind are gratefully acknowledged for their support of the WAXI-3 project (P934B). This study was also partly supported by the Hammond and Nisbet fellowship at the University of Western Australia. This study is one of the key outcomes of collaborative research and we wish to recognise our WAXI-3 research colleagues from partner institutions worldwide. The authors also wish to acknowledge the excellent work undertaken by the Bureau de Recherches Géologiques et Minières (BRGM) more than 25 years ago (Milési et al. 1991, 1992), which provided a solid foundation for this study. Finally, the authors would like to thank Georges Beaudoin, Jochen Kolb, Richard Goldfarb, and two anonymous reviewers for their constructive feedback, which improved the quality of the manuscript.
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Masurel, Q., Eglinger, A., Thébaud, N. et al. Paleoproterozoic gold events in the southern West African Craton: review and synopsis. Miner Deposita 57, 513–537 (2022). https://doi.org/10.1007/s00126-021-01052-5
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DOI: https://doi.org/10.1007/s00126-021-01052-5