The Logoualé Band: A large Archean crustal block in the Kenema-Man domain (Man-Leo rise, West African Craton) remobilized during Eburnean orogeny (2.05 Ga)

Kouamelan, Alain Nicaise; Kra, Kouassi Serge Auguste; Djro, Sagbrou Chérubin; Paquette, Jean‐Louis; Peucat, Jean-Jacques

doi:10.1016/j.jafrearsci.2017.09.004

Cited by 12 publications

(6 citation statements)

References 39 publications

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“…In the Kouibli zone of the Kenema-Man domain (Fig. 2), this P-T path is associated with similar ages of 2030-2050 Ma (Sm-Nd garnet, U-Pb monazite; Kouamelan et al, 1997Kouamelan et al, , 2018Cocherie et al, 1998). Similar ages (2041 ± 19 Ma and 2037 ± 14 Ma, U-Pb zircon) were also reported from southeastern Guinea and interpreted as a late high-temperature metamorphic event (Thiéblemont et al, 2004).…”

Section: Regional Correlationssupporting

confidence: 73%

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

Koffi,

Baratoux,

Pitra

et al. 2023

BSGF - Earth Sci. Bull.

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The Sassandra-Cavally (SASCA) domain (SW Côte d’Ivoire) marks the transition between the Archaean Kenema-Man craton and the Palaeoproterozoic (Rhyacian) Baoule-Mossi terranes. It is characterized by the tectonic juxtaposition of granulite-facies and amphibolite-facies rocks. Migmatitic grey gneisses, garnet-cordierite-sillimanite migmatitic paragneisses and garnet-staurolite-bearing micaschists reached peak pressure conditions ranging from ~6.6 kbar at 620°C to ~10 kbar at 820°C. These conditions are associated with the first recorded deformation D1 and correspond to a Barrovian geothermal gradient of ~25°C/km. Subsequent exhumation, associated with a second deformation D2, was marked by decompression followed by cooling along apparent geothermal gradients of ~40°C/km. A D3 deformation phase is marked by folding and local transposition of the regional S1/S2 foliation by E-W trending shear zones. LA-ICP-MS U-Pb dating of monazite, which displays complex internal structures, reveals four age groups as a function of their textural position: 1) Rare relictual zones yield dates at the Archaean-Palaeoproterozoic transition (c. 2400–2600 Ma); 2) a cluster of dates centered at c. 2037 Ma. This cluster includes dates from crystals located in the S2 foliation of the migmatitic grey gneiss, which suggests that this is the age for the D2 exhumation; 3) a cluster of dates centered at c. 2000 Ma, and 4) dates spreading from c. 1978 to 1913 Ma, documented for the first time in the West African Craton monazites. The ages of the latter two groups are similar to the ones identified in the Guiana Shield, and could be attributed to a disturbance by fluids, to a periodic opening of U-Pb system or to an episodic crystallization of monazite during slow cooling lasting several tens of Myrs. These data bring new petro-tectonic and geochronological constraints on the contact between the Rhyacian Baoule-Mossi terrains and the Archaean Kenema-Man nucleus, and confirm the collisional character of the polyphase tectono-metamorphic evolution of the SASCA domain during the Eburnean orogeny. They suggest a transitional regime between the predominance of gravitational instabilities and modern plate tectonics. The exhumation of the granulite- and amphibolite-facies rocks results from a combination of crustal-scale folding associated with lateral flow and regional transcurrent shear zones, which would explain the juxtaposition of rocks that reached significantly different P–T conditions.

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Section: Regional Correlationssupporting

confidence: 73%

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

Koffi,

Baratoux,

Pitra

et al. 2023

BSGF - Earth Sci. Bull.

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“…The hybrid province (Fig. 7b) has undergone mostly Eburnean high-grade metamorphism (Pitra et al, 2010) and consists of reworked Archean crust and hybrid Archean-Birimian crust (Kouamelan et al, 1997(Kouamelan et al, , 2018. It is affected by ENE-trending shear lenses pinched south of the Archean province against the Ivorian province (Fig.…”

Section: Fabric and Shear Zone Patternsmentioning

confidence: 99%

Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

Chardon

Bamba

Traoré

2020

BSGF - Earth Sci. Bull.

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Shear zones of the Paleoproterozoic Eburnean accretionary Orogen (West African craton) are investigated by means of large-scale structural mapping. Regional scale (10-100 km) mapping was based on the aeromagnetic survey of Burkina Faso and craton-scale (1000 km) mapping on a compilation of fabric data. At both scales, shear zones are arranged as an anastomosed transpressional network that accommodated distributed shortening and lateral flow of the orogenic lithosphere between the converging Kénéma-Man and Congo Archean provinces. Structural interference patterns at both scales were due to three-dimensional partitioning of progressive transpressional deformation and interactions among shear zones that absorbed heterogeneities in the regional flow patterns while maintaining the connectivity of the shear zone network. Such orogen-scale kinematic patterns call for caution in using the deformation phase approach without considering the “bigger structural picture” and interpreting displacement history of individual shear zones in terms of plate kinematics. The West African shear zone pattern is linked to that of the Guiana shield through a new transatlantic correlation to produce an integrated kinematic model of the Eburnean-Transamazonian orogen.

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“…The Man domain, in the narrowest sense, could be limited to the area between parallels 6°N and 8°N and is divided into two domains by the Man-Danané fault. The northern domain is mainly composed of tonalitic grey gneiss, while the southern domain can be subdivided into three sub-domains (Kouamelan et al, 1997a;Kouamelan et al, 2018). These are composed of:…”

Section: Geological Settingmentioning

confidence: 99%

Re-evaluation of Leonian and Liberian events in the geodynamical evolution of the Man-Leo Shield (West African Craton)

Koffi

Kouamelan

Allialy

et al. 2020

Precambrian Research

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The Logoualé Band: A large Archean crustal block in the Kenema-Man domain (Man-Leo rise, West African Craton) remobilized during Eburnean orogeny (2.05 Ga)

Cited by 12 publications

References 39 publications

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton

Re-evaluation of Leonian and Liberian events in the geodynamical evolution of the Man-Leo Shield (West African Craton)

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