Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West ... more Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West Africa and one in South America were dated using the high precision U–Pb TIMS method on baddeleyite. Some of the individual dykes reach over 300 km in length and they are considered parts of much larger systems of mafic dyke swarms representing the plumbing systems for large igneous provinces (LIPs). The new U–Pb ages obtained for the investigated swarms in the southern West African Craton (WAC) are the following (oldest to youngest): 1791 ± 3 Ma for the N010° Libiri swarm, 1764 ± 4 Ma for the N035° Kedougou swarm, 1575 ± 5 for the N100° Korsimoro swarm, ~1525–1529 Ma for the N130° Essakane swarm, 1521 ± 3 Ma for the N90° Sambarabougou swarm, 915 ± 7 Ma for the N070° Oda swarm, 867 ± 16 Ma for the N355° Manso swarm, 202 ± 5 Ma and 198 ± 16 Ma for the N040° Hounde swarm, and 200 ± 3 Ma for the sills in the Taoudeni basin. The last ones are related to the Central Atlantic Magmatic Province (CAMP) event. The Hounde swarm is oblique to the dominant radiating CAMP swarm and may be linked with the similar-trending elongate Kakoulima intrusion in Guinea. In addition, the N150° Kayser swarm (Amazonian craton, South America) is dated at 1528 ± 2 Ma, providing a robust match with the Essakane swarm in a standard Amazonia-West African craton reconstruction, and resulting in a combined linear swarm >1500 km by >1500 km in extent. The Precambrian LIP barcode ages of c. 1790, 1765–1750, 1575, 1520, 915. 870 Ma for the WAC are compared with the global LIP record to identify possible matches on other crustal blocks, with reconstruction implications. These results contribute to the refinement of the magmatic ‘barcode’ for the West African and Amazonian cratons, representing the first steps towards plausible global paleogeographic reconstructions involving the West African and Amazonian cratons.
The Fodjomekwet-Fotouni shear zone (FFSZ) belongs to the western part of the Central Cameroon She... more The Fodjomekwet-Fotouni shear zone (FFSZ) belongs to the western part of the Central Cameroon Shear Zone (CCSZ). From the border to the core, the FFSZ is made of: (i) protomylonites, (ii) garnet-sillimanite mylonites and (iii) garnet-sillimanite ultramylonites. Structural data indicate (1) a N40E mylonitic foliation trend (strongly dipping toward NE or SW) with strike varying between N34E–78NW at Fotouni and N52E–61SE at Fodjomekwet; (2) a stretching lineation (plunging toward NE or SW) with best line varying between 224/4 at Fotouni and 232/10 at Fodjomekwet; (3) sinistral (N–S) and dextral (NE–SW) kinematic markers, respectively correlated to the D2 and D3 of the CCSZ deformation phases. The presence of relic sinistral shear markers wrapped by dominant dextral shear markers rendered difficult the understanding of the FFSZ evolution. Anisotropy of magnetic susceptibility in the FFSZ shows that magnetic fabrics are characterized by dominant NE–SW and locally N–S to NNE–SSW tren...
The Fada N′Gourma area in Burkina Faso is underlain by Paleoproterozoic rocks that make the north... more The Fada N′Gourma area in Burkina Faso is underlain by Paleoproterozoic rocks that make the northeastern West-African Craton. This region is composed of NE-trending volcano-sedimentary belts and foliated tonalites, affected by several shear zones. A generation of younger, ∼2100 Ma-old, non-foliated biotite-bearing granites intrudes the former rock units. We have investigated the younger granite pluton of Kouare that was previously considered
Abstract Three different generations of doleritic dykes crosscutting Paleoproterozoic basement we... more Abstract Three different generations of doleritic dykes crosscutting Paleoproterozoic basement were distinguished using interpretation of regional magnetic airborne data of Burkina Faso. Some of the dykes reach up to 300km in length and the bulk orientations of ...
... Luc; Jessell, Mark. Affiliation: AA(Département de Géologie, Université de Ouagadougou, Burki... more ... Luc; Jessell, Mark. Affiliation: AA(Département de Géologie, Université de Ouagadougou, Burkina Faso, ), AB(Département de Géologie, Université de Ouagadougou, Burkina Faso, ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Un... more ... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse, France ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Un... more ... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse, France ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
Abstract Amphibole is a common constituent mineral of mafic rocks, yet it's complex mine... more Abstract Amphibole is a common constituent mineral of mafic rocks, yet it's complex mineral structure often makes it difficult to distinguish unambiguously if it is of magmatic, metamorphic, hydrothermal or metasomatic origin. Besides primary magmatic amphibole, ...
Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West ... more Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West Africa and one in South America were dated using the high precision U–Pb TIMS method on baddeleyite. Some of the individual dykes reach over 300 km in length and they are considered parts of much larger systems of mafic dyke swarms representing the plumbing systems for large igneous provinces (LIPs). The new U–Pb ages obtained for the investigated swarms in the southern West African Craton (WAC) are the following (oldest to youngest): 1791 ± 3 Ma for the N010° Libiri swarm, 1764 ± 4 Ma for the N035° Kedougou swarm, 1575 ± 5 for the N100° Korsimoro swarm, ~1525–1529 Ma for the N130° Essakane swarm, 1521 ± 3 Ma for the N90° Sambarabougou swarm, 915 ± 7 Ma for the N070° Oda swarm, 867 ± 16 Ma for the N355° Manso swarm, 202 ± 5 Ma and 198 ± 16 Ma for the N040° Hounde swarm, and 200 ± 3 Ma for the sills in the Taoudeni basin. The last ones are related to the Central Atlantic Magmatic Province (CAMP) event. The Hounde swarm is oblique to the dominant radiating CAMP swarm and may be linked with the similar-trending elongate Kakoulima intrusion in Guinea. In addition, the N150° Kayser swarm (Amazonian craton, South America) is dated at 1528 ± 2 Ma, providing a robust match with the Essakane swarm in a standard Amazonia-West African craton reconstruction, and resulting in a combined linear swarm >1500 km by >1500 km in extent. The Precambrian LIP barcode ages of c. 1790, 1765–1750, 1575, 1520, 915. 870 Ma for the WAC are compared with the global LIP record to identify possible matches on other crustal blocks, with reconstruction implications. These results contribute to the refinement of the magmatic ‘barcode’ for the West African and Amazonian cratons, representing the first steps towards plausible global paleogeographic reconstructions involving the West African and Amazonian cratons.
The Fodjomekwet-Fotouni shear zone (FFSZ) belongs to the western part of the Central Cameroon She... more The Fodjomekwet-Fotouni shear zone (FFSZ) belongs to the western part of the Central Cameroon Shear Zone (CCSZ). From the border to the core, the FFSZ is made of: (i) protomylonites, (ii) garnet-sillimanite mylonites and (iii) garnet-sillimanite ultramylonites. Structural data indicate (1) a N40E mylonitic foliation trend (strongly dipping toward NE or SW) with strike varying between N34E–78NW at Fotouni and N52E–61SE at Fodjomekwet; (2) a stretching lineation (plunging toward NE or SW) with best line varying between 224/4 at Fotouni and 232/10 at Fodjomekwet; (3) sinistral (N–S) and dextral (NE–SW) kinematic markers, respectively correlated to the D2 and D3 of the CCSZ deformation phases. The presence of relic sinistral shear markers wrapped by dominant dextral shear markers rendered difficult the understanding of the FFSZ evolution. Anisotropy of magnetic susceptibility in the FFSZ shows that magnetic fabrics are characterized by dominant NE–SW and locally N–S to NNE–SSW tren...
The Fada N′Gourma area in Burkina Faso is underlain by Paleoproterozoic rocks that make the north... more The Fada N′Gourma area in Burkina Faso is underlain by Paleoproterozoic rocks that make the northeastern West-African Craton. This region is composed of NE-trending volcano-sedimentary belts and foliated tonalites, affected by several shear zones. A generation of younger, ∼2100 Ma-old, non-foliated biotite-bearing granites intrudes the former rock units. We have investigated the younger granite pluton of Kouare that was previously considered
Abstract Three different generations of doleritic dykes crosscutting Paleoproterozoic basement we... more Abstract Three different generations of doleritic dykes crosscutting Paleoproterozoic basement were distinguished using interpretation of regional magnetic airborne data of Burkina Faso. Some of the dykes reach up to 300km in length and the bulk orientations of ...
... Luc; Jessell, Mark. Affiliation: AA(Département de Géologie, Université de Ouagadougou, Burki... more ... Luc; Jessell, Mark. Affiliation: AA(Département de Géologie, Université de Ouagadougou, Burkina Faso, ), AB(Département de Géologie, Université de Ouagadougou, Burkina Faso, ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Un... more ... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse, France ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Un... more ... Authors: Metelka, Vaclav; Baratoux, Lenka; Jessell, Mark; Naba, Seta. Affiliation: AB(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse, France ), AC(IRD, Université Toulouse III, UMR 5563, UR 154, LMTG, 14 av E. Belin, 31400, Toulouse ...
Abstract Amphibole is a common constituent mineral of mafic rocks, yet it's complex mine... more Abstract Amphibole is a common constituent mineral of mafic rocks, yet it's complex mineral structure often makes it difficult to distinguish unambiguously if it is of magmatic, metamorphic, hydrothermal or metasomatic origin. Besides primary magmatic amphibole, ...
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