Lithostratigraphic evolution of the Bandamian Volcanic Cycle in central Côte d’Ivoire: Insights into the late Eburnean magmatic resurgence and its geodynamic implications

Mériaud, Nicolas; Thébaud, Nicolas; Masurel, Quentin; Hayman, Patrick; Jessell, Mark; Kemp, Anthony I.S.; Evans, Noreen J.; Fisher, C. M.; Scott, Pete

doi:10.1016/j.precamres.2020.105847

Cited by 12 publications

(14 citation statements)

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“…Inversion of the Bagoé, Siguiri, Kofi, and Dialé-Daléma basins in the northwest part of the Baoulé-Mossi Domain occurred before docking of the Baoulé-Mossi and Archean Kénéma-Man domains at ca. 2095 Ma (Lahondère et al 2002;Eglinger et al 2017;Thébaud et al 2020;Mériaud et al 2020). Field structural relationships imply docking of the Archean and Paleoproterozoic domains was associated with region-wide dextral reactivation of major shear zones such as the Sassandra fault, Banifing shear zone, and Seikorole shear zone (Fig.…”

Section: Deformation and Metamorphism Of The Deep Water Sedimentary Series During The Onset Of The Eburnean Orogeny (Ca 2110-2095 Ma)mentioning

confidence: 99%

“…Although the internal stratigraphy of each series differs somewhat, several have been associated with a predominantly deep water depositional setting (Davis et al 2015;Grenhölm et al 2019). Carbonate and evaporitic sedimentary rocks deposited in shallower water settings appear confined to the western-most Siguri, Kofi, and Dialé-Daléma series in Mali and Guinea (Milési et al 1989;Ledru et al 1991;Lebrun et al 2016;Lambert-Smith et al 2016).…”

Section: Siguirimentioning

confidence: 99%

“…Inversion of the Siguiri basin had occurred by ca. 2095 Ma when deformed sedimentary rock sequences were unconformably overlain by volcanic rocks of the Bandamian series (Allibone et al 2020;Mériaud et al 2020).…”

Section: Deformation and Metamorphism Of The Deep Water Sedimentary Series During The Onset Of The Eburnean Orogeny (Ca 2110-2095 Ma)mentioning

confidence: 99%

“…Volcanic, volcano-sedimentary, and plutonic rocks of the Baoulé-Mossi Domain were deposited and emplaced during several major episodes of Paleoproterozoic crustal growth between ca. 2300 and 2060 Ma (Abouchami et al 1990;Boher et al 1992;Sylvester and Attoh 1992;Baratoux et al 2011;Grenhölm et al 2019;Mériaud et al 2020), including the ca. 2200-2135 Ma Eoeburnean phase and the ca.…”

Section: Introductionmentioning

confidence: 99%

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Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Masurel

Eglinger²,

Thébaud³

et al. 2021

Miner Deposita

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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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Section: Deformation and Metamorphism Of The Deep Water Sedimentary Series During The Onset Of The Eburnean Orogeny (Ca 2110-2095 Ma)mentioning

confidence: 99%

Section: Siguirimentioning

confidence: 99%

Section: Deformation and Metamorphism Of The Deep Water Sedimentary Series During The Onset Of The Eburnean Orogeny (Ca 2110-2095 Ma)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Masurel

Eglinger²,

Thébaud³

et al. 2021

Miner Deposita

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“…The ME2 period is also characterized by emplacement of volcanic rocks (basalt, andesite, dacite, rhyolite, épiclastite) defined as the Bandamian cycle only described to the west of the OFSZ (Fig. 1) and dated between 2120 and 2080 Ma (Gasquet et al, 2003;Grenholm et al, 2019b;Hirdes et al, 1996;Mériaud et al, 2020). The post-ME2 magmatic period is represented by undeformed plutons of potassic and biotite granites that crystallized between 2110 Ma and 2070 Ma (Baratoux et al, 2011;Metelka et al, 2011;Parra-Avila et al, 2017.…”

Section: Geological Context Of the Mangodara District Within The West African Cratonmentioning

confidence: 99%

Petrogenetic links between rare metal-bearing pegmatites and TTG gneisses in the West African Craton: The Mangodara district of SW Burkina Faso

Bonzi

Vanderhaeghe

Lichtervelde

et al. 2021

Precambrian Research

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We describe the geological context of rare metal-bearing pegmatites from the Mangodara district (South-West Burkina Faso, Paleoproterozoic West African Craton) and discuss their petrogenesis and links with the host rocks. The Mangodara district exposes a gneiss-granitoid complex structured in a regional-scale dome, mantled by granodioritic gneiss enclosing rafts of amphibolite, micaschist and paragneiss, and cored by tonalitic to trondhjemitic gneisses. These gneisses enclose granitoid plutons, and four populations of rare metal-bearing pegmatites: titanite-allanite-, apatite-zircon-, garnetcolumbite (Li, Nb) and garnet-REE (Ti, Y, HREE)-bearing varieties.2 Rafts of migmatitic amphibolite, micaschist and paragneiss are chemically equivalent to nearby Birimian greenstone belts. An origin of the gneiss-granitoid complex by partial melting is suggested by diffuse contacts of rafts with the gneisses as well as the presence of garnet-bearing or hornblendebearing leucosome in paragneiss and in amphibolites, respectively. Textural continuity between pegmatites and granitic veins concordant to the foliation of the gneisses point to syntectonic segregation of the pegmatite-forming magmas.The compositions of gneisses and plutonic rocks spread between a Na-rich pole and a K-rich pole.Granodioritic gneiss, hornblende-biotite granodiorite and potassic biotite granitoids define a K-rich series attributed to relatively low-pressure high-degree partial melting of dominantly paragneiss, which accounts for low to absent LILE and HFSE fractionation compared to the paragneiss. Tonalitictrondhjemitic gneiss, a trondhjemite and a peraluminous two-mica tonalite belong to a Na-rich series characterized by low K content and strong depletion in REE and HFSE, which might reflect plagioclase clustering after partial melting at a relatively high pressure of amphibolite, and fractionation of HFSE-REE-bearing minerals.U-Pb dating of zircon from a titanite-allanite-bearing pegmatite at 2094.3 ± 8.8 Ma and of apatite from tonalitic-trondhjemitic gneiss, apatite-zircon-bearing pegmatite and granodioritic gneiss at 2094 ± 21 Ma, 2055 ± 20 Ma, and 2041 ± 33 Ma respectively, confirm that partial melting, melt segregation and crystallization-cooling occurred during the Eburnean orogeny.Based on these data, we propose that (i) titanite-allanite-and apatite-zircon-bearing pegmatites result from syntectonic segregation of residual melt during crystallization of the tonalitic-trondhjemitic gneiss, (ii) garnet-columbite-bearing pegmatites originate from syntectonic melt segregation from the migmatitic paragneiss, and (iii) garnet-REE-bearing pegmatites derive from segregation of a residual melt within the granodioritic gneiss.

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West African Leo‐Man Shield Metallogenic Province

EGLINGER,

ANDRÉ‐MAYER,

THÉBAUD

et al. 2023

Metallic Resources 2

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Lithostratigraphic evolution of the Bandamian Volcanic Cycle in central Côte d’Ivoire: Insights into the late Eburnean magmatic resurgence and its geodynamic implications

Cited by 12 publications

References 99 publications

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Paleoproterozoic gold events in the southern West African Craton: review and synopsis

Petrogenetic links between rare metal-bearing pegmatites and TTG gneisses in the West African Craton: The Mangodara district of SW Burkina Faso

West African Leo‐Man Shield Metallogenic Province

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