Abstract
The Mayo-Kebbi massif (Chad) exposes a Neoproterozoic juvenile crustal segment that has been tectonically accreted in the Central African Orogenic Belt and reworked during the Pan-African orogeny. It comprises a syntectonic high-K magmatic suite including the Zabili A-type granitic pluton. The Zabili pluton is made of a highly differentiated granite generated by fractional crystallization of a magma formed by partial melting of a Neoproterozoic juvenile protolith. Syn- to post-magmatic ductile to brittle deformation of the Zabili pluton is associated with metasomatism and deposition of uranium. Primary magmatic U-bearing minerals are zircon, monazite, and uranothorite. Late-magmatic deformation and Na-metasomatism are marked by the development of R’ antithetic shear zones with high-temperature dynamic recrystallization of K-feldspar and Ca-plagioclase phenocrysts coeval with crystallization of albite along deformation bands and grain boundaries, and crystallization of interstitial amphibole, calcite epidote and albite also affected by intracrystalline deformation. At this stage, U-bearing minerals are monazite, uraninite, brannerite (pseudomorphosed in ekanite). This late-magmatic event is dated by U–Th–Pb on monazite at 599 ± 4 Ma. Brittle deformation and Ca-metasomatism are marked by cataclastic zones and veins containing albite, epidote, calcite, chlorite, apatite, metamict zircon, pitchblende, U-silicates, and iron oxides. U-bearing minerals are altered and/or remobilized in ekanite, kasolite, and uranophane. These data suggest that the uranium mineralization hosted by the Zabili pluton records a superposition of processes and traces extreme crustal differentiation of a Neoproterozoic juvenile crustal segment reworked during the Pan-African orogeny.
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Acknowledgments
The present version of this paper has been significantly improved following the comments of Nelson Eby, Philippe Boulvais, Justine Jaguin, Andrew Putnis, and an anonymous reviewer on different versions of the manuscript. Georges Beaudoin and Mostafa Fayek are thanked for thorough editorial handling. The authors are grateful to the N’Djamena University for scientific work exchanges and field trip assistance. The authors greatly thank SCMEM facilities (GeoRessources S. Mathieu, L. Mouton and O. Rouer), as well as the GeoRessources thin section laboratory (C. Demeurie and A. Flammang) for the quality of sample preparation and the SARM (CRPG) for providing whole rock analyzes. Geochemical and geochronological analyses as well as specifications regarding electron probe microanalysis are reported in Electronic supplementary materials (ESM) 1, 2, 3, and 4.
Funding
This work is part of the PhD work of Diondoh Mbaguedje who benefited from a scholarship attributed by the French scientific cooperation in Chad, which also provided part of the funding for analytical work. Pascal Villecroix, Attaché Culturel at the French embassy in N’Djamena is warmly thanked for his indefectible support. This work is also part of the URCO project supported by CNRS (Centre National de la Recherche Scientifique) scientific national program NEEDS co-funded by CEA and AREVA.
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Olivier, V., André-Mayer, AS., Diondoh, M. et al. Uranium mineralization associated with late magmatic ductile to brittle deformation and Na–Ca metasomatism of the Pan-African A-type Zabili syntectonic pluton (Mayo-Kebbi massif, SW Chad). Miner Deposita 56, 1297–1319 (2021). https://doi.org/10.1007/s00126-020-00999-1
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DOI: https://doi.org/10.1007/s00126-020-00999-1