Lithostratigraphy of the early Proterozoic Toumodi Volcanic Group in central côte d'ivoire: implications for Birrimian stratigraphic models

Mortimer, J.

doi:10.1016/0899-5362(92)90057-j

Cited by 29 publications

(22 citation statements)

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“…Cette ceinture appartenant au domaine d'âge protérozoïque à la dorsale de Man (Figure 1 et 2) est constituée d'un assemblage de roches birimiennes volcaniques et sédimentaires métamorphisé dans le faciès des schistes verts (Yacé, 1984). Des granitoïdes post-tectoniques font intrusion dans les lithologies de cette ceinture (Yacé, 1984;Mortimer, 1992;Daouda, 1998).…”

Section: Contexte Geologiqueunclassified

Les Altérations Hydrothermales Associées À La Minéralisation Aurifère Du Gisement De Dougbafla (District d’Oumé-Hiré, Centre-Ouest De La Côte d’Ivoire)

Sidik

Yacouba

J-L.

2017

ESJ

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The Dougbafla gold deposit is located in the West-Central part of Côte d'Ivoire at about 240 km from Abidjan, on the Birimian greenstone belt of Fettèkro (West African craton). The lithologies of this deposit can be divided into three lithotectonic units which correspond to volcanic, sedimentary, and plutonic assemblages metamorphosed in the shale facies. Hydrothermalism, on the one hand, caused a pervasive alteration of the primary paragenesis marked by sericitic, silica, and carbonate alteration. On the other hand, it causes a vein alteration materialized by quartz veins. These hydrothermal alterations induced two types of gold mineralization in the Dougbafla deposit. These are: (i) disseminated gold and sulphide mineralization in the granophyre associated with sericite, silica and dolomite alteration in which no quartz vein has been reported; this type however is controlled by the intrusion of granophyre and (ii) a quartz vein mineralization controlled by deformation.Keywords: Dougbafla, Birimian, Hydrothermalism, sericitic, silica RésuméLe gisement aurifère de Dougbafla est situé à 240 km d'Abidjan au Centre-Ouest de la Côte d'Ivoire sur la ceinture de roches vertes birimiennes de Fettèkro (craton ouest Africain). Les lithologies de ce gisement peuvent être subdivisées en trois unités lithotectoniques correspondant à des assemblages volcaniques, sédimentaires et plutoniques métamorphisées dans European Scientific Journal October 2017 edition Vol.13, No.30 ISSN: 1857 -7881 (Print) e -ISSN 1857 109 le faciès des schistes verts. L'hydrothermalisme a provoqué d'une part, une altération pervasive de la paragenèse primaire des marquée par la séricitisation, la silicification et la carbonisation et d'autre part par une altération filonienne matérialisée par des veines de quartz. Ces altérations hydrothermales ont induit deux types de minéralisation aurifère dans le gisement de Dougbafla. Il s'agit : (i) d'une minéralisation disséminée à or et sulfures dans le granophyre altéré en séricite, en silice et en dolomite dans lequel aucun filon de quartz n'a été signalé; ce type est contrôlé par l'intrusion de granophyre et (ii) d'une minéralisation filonienne liée à des veines de quartz, contrôlée par la déformation.

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Section: Contexte Geologiqueunclassified

Les Altérations Hydrothermales Associées À La Minéralisation Aurifère Du Gisement De Dougbafla (District d’Oumé-Hiré, Centre-Ouest De La Côte d’Ivoire)

Sidik

Yacouba

J-L.

2017

ESJ

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“…La géologie du sillon de ToumodiFètêkro, où se localise notre zone d'étude est connue grâce aux travaux de Yacé (1982), Lemoine (1985Lemoine ( , 1988, Mortimer (1990Mortimer ( , 1992Mortimer ( , 2016, Leake (1992), Daouda (1998), Houssou (2013), Gnanzou (2014), Ouattara (2015), etc. Il est constitué de roches variées, peu ou moyennement métamorphisées (quartzites, micaschistes, para-amphibolites et schistes amphiboliques).…”

Section: Zone Figureunclassified

Petrographie Des Volcanites Et Plutonites De La Partie Sud Du Sillon Volcano-Sedimentaire De Toumodi-Fetekro (Cote D’ivoire)

Inza

Nicaise

Chérubin

et al. 2017

ESJ

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The southern part of Toumodi-Fètêkro greenstone belt is located in the Center -Southeast of Ivory Coast. Petrographic study of volcanic and plutonic rocks shows three units. The first unit is composed of basaltic to rhyolitic lavas which imply effusive character. Then we have volcanosedimentary unit composed of pyroclastic formations (lapilli tuff, breccia, ash deposit and ignimbrites) and the pillow-lavas. Indeed, the presence of this last shows clearly that an explosive volcanism and a submarine effusive volcanism have occurred during during the setting of Toumodi-Fètêkro belt. Plutonic unit is constituted of gabbroic to granitic rocks. Sericite, chlorite, epidote observed in these rocks are consistent with the impacts of greenschist facies metamorphism. The rocks of the southern part of the Toumodi-Fètêkro greenstone belt are formed in a subduction context rather than in oceanic plateaus context because of the old inheritance, sometimes of Archean age, found somewhere in theBirimiandomain. The lithologies of the southern part of Toumodi-Fètêkro meet elsewhere in the other Birimian greenstone belts. Also, these lithologies are affected by a hydrothermal alteration due to the abundant veins of quartz, carbonates, sericite, chlorite, epidote, sulphides and oxides. However, volcanic show in some places amphibolit facies metamorphism. Keywords

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“…The genetic processes of the Paleoproterozoic Birimian rocks of the WAC have long been the subject of debate. One school of thought is of the view that the Paleoproterozoic Birimian rocks were generated from plume‐related magmatism (e.g., Abouchami et al, ; Boher et al, ; Pouclet, Vidal, Delor, Simeon, & Alric, ), but another has proposed that the entire Birimian rocks formed in an island arc environment (Mortimer, ; Sylvester & Attoh, ; Ama Salah, Liégeois, & Pouclet, ; Dia, Van Schmus, & Kröner, ; Béziat et al, ; Asiedu et al, ; Dampare, Shibata, Asiedu, & Osae, ; Attoh, Evans, & Bickford, ; Dampare, Shibata, Asiedu, Osae, & Banoeng‐Yakubo, ). In Ghana, studies carried out on the Paleoproterozoic Birimian rocks have concentrated mostly on the Ashanti and the Sefwi Greenstone Belts, whereas the Kibi‐Winneba Greenstone Belt, occupying the southeastern part of the WAC, has received little attention.…”

Section: Introductionmentioning

confidence: 99%

Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

Sakyi

Anum

et al. 2017

Geological Journal

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Metavolcanics and mafic intrusive rocks of the Paleoproterozoic Birimian terrane in the southeastern part of the West African Craton, Ghana, were analyzed for major and trace elements and Nd and Sr isotopic data to constrain the geodynamic evolution of the Birimian Supergroup. The metavolcanic rocks consist of metabasalts, meta‐andesites, and amphibolites, whereas the mafic intrusions are mainly gabbros, hornblendites, and dolerites. The rocks are tholeiitic in composition and show the classic features of arc magmatism. The metavolcanics display significant enrichments in large ion lithophile elements (LILE) and light rare earth elements, relative to high field strength elements (HFSE) and heavy rare earth elements. The multielement patterns of the rocks also show positive Pb, Ba, Th, and Sr and negative Nb, Ta, and Ce anomalies that are typical characteristics of subduction‐related magmas. They also have La/Nb ratios <3 and La/Ta ratios <43 that are similar to other Archean and Birimian greenstone belts in West Africa. The rocks have εNd (2.1 Ga) values of −0.96 to +2.60, and Nd model ages of 2.24–2.51 Ga (TDM1) and 2.16–2.45 Ga (TDM2), indicating their juvenile character with possible contributions from pre‐Birimian crustal materials in their sources. The εNd values suggest a depleted source and further indicate that they were probably produced in an almost entirely oceanic environment with minor influence from the continental crust. The Nd isotopic results are consistent with the island arc model, which views Paleoproterozoic terranes of the West African Craton in the context of subduction–accretion processes. Accordingly, these processes may have played a role in the formation of the Columbia supercontinent during the Paleoproterozoic (2.1–1.8 Ga) orogenic events.

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Lithostratigraphy of the early Proterozoic Toumodi Volcanic Group in central côte d'ivoire: implications for Birrimian stratigraphic models

Cited by 29 publications

References 6 publications

Les Altérations Hydrothermales Associées À La Minéralisation Aurifère Du Gisement De Dougbafla (District d’Oumé-Hiré, Centre-Ouest De La Côte d’Ivoire)

Les Altérations Hydrothermales Associées À La Minéralisation Aurifère Du Gisement De Dougbafla (District d’Oumé-Hiré, Centre-Ouest De La Côte d’Ivoire)

Petrographie Des Volcanites Et Plutonites De La Partie Sud Du Sillon Volcano-Sedimentaire De Toumodi-Fetekro (Cote D’ivoire)

Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

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