Petrogenesis of juvenile-type Birimian (Paleoproterozoic) granitoids in Central Côte-d'Ivoire, West Africa: geochemistry and geochronology

Doumbia, Siaka; Pouclet, André; Kouamelan, Alain Nicaise; Peucat, Jean-Jacques; Vidal, Max; Delor, Claude

doi:10.1016/s0301-9268(97)00201-5

Cited by 190 publications

(139 citation statements)

References 59 publications

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“…The area is 700 km northwest of Accra, the national capital. Underlying the area are metamorphosed lavas and pyroclastic rocks plus dolerites that are locally intruded by gabbro (Leube et al, 1990;Liegeois et al, 1991;Hirdes et al, 1992;Doumbia et al, 1998;Oberthur et al, 1998;Egal et al, 2002;Gasquet et al, 2003;Naba et al, 2004;Feybesse et al, 2006 However the Birimian rocks of southern Ghana have migmatite and granitic intrusions that have generally been classified into two broad categories (Leube et al, 1992). These are hornblende-rich varieties that are closely associated with the metavolcanic rocks and known as the 'Dixcove' or 'belt' type; and mica-rich varieties which tend to border the volcanic belt.…”

Section: Location and Geology Of The Study Areamentioning

confidence: 99%

Regolith mapping of deeply weathered terrain in savannah regions of the Birimian Lawra Greenstone Belt, Ghana

Arhin

Jenkin

Cunningham

et al. 2015

Journal of Geochemical Exploration

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ABSTRACT:A regolith map for the Lawra Belt has been developed by categorizing the regolithlandform units by processing and interpreting remote sensing data. Regolith landform units were extracted from Landsat band ratios 3/1 and 5/4 to map ferruginous saprolite and lags; band ratio 5/7 was used to identify residual regolith and band ratio 4/2 was employed to separate ferruginous units from non-ferruginous regolith.Additional regolith landform units' discrimination was provided by compiling and interpolating radiometric data particularly for Landsat TM poorly defined areas.SRTM images were used to mark out the extent of the alluvial plains. High topographical terrains were marked from DEM image to represent the residual areas.Regolith landform unit (RLU) map that showed residual (relict and erosional), ferruginous, and depositional domains of the Lawra Belt was developed by superimposing the extractions made from the remote sensed data. Interpretive map generated from the remote sensed image analysis was validated by first creating a non-genetic regolith map through ground truth survey. The non-genetic map based on A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 | P a g e spatial distributions of the different regolith mapping units were classified on genetic classes or regimes based on regolith-landform similarities to develop a genetic map.The interpretive and the genetic map were superimposed to develop the regolith map for the Lawra Belt. The inliers and outliers presenting compositional overlaps within broad regolith classes were rectified from the field mapping information. The combined approach of image analysis and the ground truth mapping grouped the regolith of Lawra Belt into ferruginous (F), relict (R), erosional (E) and depositional (D) regimes.

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Section: Location and Geology Of The Study Areamentioning

confidence: 99%

Regolith mapping of deeply weathered terrain in savannah regions of the Birimian Lawra Greenstone Belt, Ghana

Arhin

Jenkin

Cunningham

et al. 2015

Journal of Geochemical Exploration

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“…older (Abouchami et al, 1990), as sediments and volcanics in an extensive geosyncline. They were later folded, metamorphosed under mostly greenschist-facies conditions and invaded by and to a lesser degree, the granitoids (e.g., Leube et al, 1990;Doumbia et al, 1998;Loh and Hirdes, 1999). In comparison to the volcanic rocks, the Birimian sedimentary rocks have received very little attention in geochemical studies even though sedimentary rocks contain a wealth of information about provenance and crustal evolution (e.g., McLennan et al, 1990McLennan et al, , 1995.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Paleoproterozoic metasedimentary rocks from the Birim diamondiferous field, southern Ghana: Implications for provenance and crustal evolution at the Archean-Proterozoic boundary

Asiedu¹,

Dampare²,

Sakyi³

et al. 2004

Geochem. J.

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Metagraywackes and metapelites from the Paleoproterozoic Birimian Supergroup in the Birim diamondiferous field, southern Ghana, were analyzed for their major and trace element contents. Compared to early Proterozoic crust, the metasedimentary rocks are enriched in ferromagnesian elements but depleted in rare earth elements (REE), high field strength elements (HFSE) (with exception of Zr), and Th. They show REE patterns similar to their Archean counterparts. The chemical data indicate that the sediments were derived from a local source of mixed felsic-mafic composition, with the latter dominating. The source rocks were the basaltic to dacitic volcanic rocks and granitoids within the Birimian greenstone belts. The chemical data further suggest their deposition in a tectonic setting comparable to modern island arcs, and that minimal old upper crust (i.e., pre-Birimian sources) was involved in their formation. The analyzed metasedimentary rocks have Eu-anomalies and Gd N /Yb N , Sm/Nd, Th/Sc, Cr/Sc and Cr/Th ratios that closely resemble those of their Archean counterparts, and therefore inconsistent with models suggesting abrupt compositional changes in upper crust at the Archean-Proterozoic boundary.

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“…Les formations birimiennes ouest-africaine ont été structuré au cours du cycle orogénique éburnéen daté entre 2,5 et 1,6 Ga. (Arnould, 1945;Roques, 1948;Soule De Lafont, 1956;Arnould, 1961;Bonhomme, 1962;Marcelin, 1971;Tagini, 1971;Bard, 1974;Yacé, 1984;Doumbia et al, 1998;Feybesse et al, 1989;Milési et al, 1989;Abouchami, 1990;et Boher et al, 1992). (Houssou, 2013), les granodiorites à Bonikro (Ouattara, 2015) et Hiré (Sonnendrucker, 1969) et dans les granophyres à Dougbafla.…”

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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Petrogenesis of juvenile-type Birimian (Paleoproterozoic) granitoids in Central Côte-d'Ivoire, West Africa: geochemistry and geochronology

Cited by 190 publications

References 59 publications

Regolith mapping of deeply weathered terrain in savannah regions of the Birimian Lawra Greenstone Belt, Ghana

Regolith mapping of deeply weathered terrain in savannah regions of the Birimian Lawra Greenstone Belt, Ghana

Geochemistry of Paleoproterozoic metasedimentary rocks from the Birim diamondiferous field, southern Ghana: Implications for provenance and crustal evolution at the Archean-Proterozoic boundary

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

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