A new metamorphic constraint for the Eburnean orogeny from Paleoproterozoic formations of the Man shield (Aribinda and Tampelga countries, Burkina Faso)

Debat, Pierre; Nikiéma, Serge; Mercier, Alain; Lompo, Martin; Béziat, Didier; Bourges, François; Roddaz, Martín; Salvi, Stefano; Tollon, Francis; Wenmenga, Urbain

doi:10.1016/s0301-9268(03)00046-9

Cited by 58 publications

(46 citation statements)

References 46 publications

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“…b magnetic foliation poles or Ouargaye (2135 ± 11 Ma). Note that such a re-heating of the host rocks during emplacement of the younger granites has already been observed by Pons et al (1995), Debat et al (2003) and Castaing et al (2003).…”

Section: Emplacement Of Kouare and Shear Folding Of The Country Rockssupporting

confidence: 68%

Structure and emplacement of granite plutons in the Paleoproterozoic crust of Eastern Burkina Faso: rheological implications

Vegas¹,

Naba²,

Bouchez³

et al. 2007

Int J Earth Sci (Geol Rundsch)

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International audienceThe 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 as forming a single body with the pluton of Satenga to the west, a pluton which likely belongs to the ?20 Ma more recent Tenkodogo-Yamba batholith. Magnetic fabric measurements have been combined with microstructural observations and the analysis of field and aeromagnetic data. The granite encloses angular enclaves of the host tonalites. Magmatic microstructures are preserved inside the pluton and solid-state, high-temperature deformation features are ubiquitous at its periphery. The presence of steeply plunging lineations in the pluton of Kouare and its adjacent host-rocks suggests that large volumes of granitic magmas became crystallized while they were ascending through the crust that was softened and steepened close to the contact. Around Kouare, the foliation in the host tonalites conforms with a map-scale, Z-shaped fold in between NNE-trending shear zones, implying a bulk clockwise rotation of the material contained in-between the shear zones, including the emplacing pluton. Regionally, the Fada N?Gourma area is concluded to result from NW-shortening associated with transcurrent shearing and vertical transfer of granitic magmas. This study concludes that the ?2200 Myears old juvenile crust of Burkina Faso was brittle before the intrusion of the biotite-granites, became softened close to them and that gravity-driven and regional scale wrench tectonics were active together

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Section: Emplacement Of Kouare and Shear Folding Of The Country Rockssupporting

confidence: 68%

Structure and emplacement of granite plutons in the Paleoproterozoic crust of Eastern Burkina Faso: rheological implications

Vegas¹,

Naba²,

Bouchez³

et al. 2007

Int J Earth Sci (Geol Rundsch)

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“…The successive accretion of granitoid groups more and more enriched in K 2 O has been already evidenced in Central Ivory Coast (Hirdes et al, 1996;Doumbia et al, 1998) with however some differences: (1) in the Kédougou Inlier the oldest emplaced granitoids are the sodic calcalkaline group of the LPC whereas in the Central Ivory Coast they are amphibole-bearing TTG granitoids; (2) in the Kédougou Inlier the amphibole-bearing TTG plutons cross-cut both the metavolcanites of the belts and the basin metasediments with development of contact metamorphism whereas in Central Ivory Coast they were emplaced before the deposition of the basin metasediments; (3) in the Kédougou Inlier the thermal aureole around the granitoid plutons is evidenced by the andalusite-staurolite association (Ndiaye et al, 1989 and this study) whereas in Ivory Coast some metamorphic aureoles are characterized by the kyanite-staurolite association (Debat et al, 2003).…”

Section: Resultsmentioning

confidence: 73%

“…According to Abouchami et al (1990), Boher et al (1992) and Pouclet et al (1996), the tholeiitic lavas are related to an oceanic plateau environment, according to Sylvester and Attoh (1992) and Ama Salah et al (1996) they are related to a back-arc environment (Sylvester and Attoh, 1992;Ama Salah et al, 1996) and finally Dia et al (1997) and Béziat et al (2000) link them to an immature arc environment. The overall tectonic regime is ascribed either to modern-like plate tectonic conditions, with dominant collision and thrusting (Ledru et al, 1994;Feybesse and Milési, 1994) or to Archean-like tectonics, with dominant transcurrent shearing and diapirism (Pons et al, , 1992(Pons et al, , 1995Vidal et al, 1996;Doumbia et al, 1998;Caby et al, 2000;Debat et al, 2003;Gasquet et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Dioh

Béziat

Debat

et al. 2006

Journal of African Earth Sciences

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“…The Baoulé-Mossi domain comprises large sedimentary basins and volcanic belts, together referred to as the Birimian, that were affected by the Eburnean orogeny (2150-1800 Ma) giving rise to regional greenschist facies metamorphism (John et al, 1999;Debat et al, 2003). These were subsequently intruded by several generations of voluminous Eburnean granitoids, which evolved over time from more calc-alkaline to potassic post-collisional types, and which occupy as much as 70 per cent of the Birimian terrane.…”

Section: Regional Geology Of West Africamentioning

confidence: 99%

A review of the mineral potential of Liberia

Gunn

Dorbor

Mankelow

et al. 2018

Ore Geology Reviews

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The Republic of Liberia in West Africa is underlain mostly by Precambrian rocks of Archaean (Liberian) age in the west and of Proterozoic (Eburnean) age in the east. By analogy with similar terranes elsewhere in the world, and in West Africa in particular, the geology of Liberia is favourable for the occurrence of deposits of a wide range of metals and industrial minerals, including gold, iron ore, diamonds, base metals, bauxite, manganese, fluorspar, kyanite and phosphate.Known gold deposits, mostly orogenic in style, occur widely and are commonly associated with north-easttrending regional shear zones. Gold mining commenced at the New Liberty deposit in western Liberia in 2015, while significant gold resources have also been identified at several other sites in both Archaean and Proterozoic terranes. Liberia has large resources of itabirite-type iron ores, most of which are located in the Liberian terrane, and was the largest producer in Africa prior to the onset of civil war in 1989. Production of iron ore is currently restricted to a single mine, Yekepa, in the Nimba Range. Other important deposits, some of them previously mined, include Bong, the Western Cluster, Putu and Goe Fantro. There is a long history of alluvial diamond production in western and central Liberia, together with more than 160 known occurrences of kimberlite. Most of the known kimberlites occur in three clusters of small pipes and abundant dykes, located at Kumgbor, Mano Godua and Weasua, close to the border with Sierra Leone. Many of these are considered to be part of a single province that includes Jurassic age diamondiferous kimberlites in Sierra Leone and Guinea.Deposits and occurrences of a wide range of other metals and industrial minerals are also known. Several of these have been worked on a small scale in the past, mainly by artisanal miners, but most are poorly known in detail with sub-surface information available at only a few localities. By comparison with most other countries in West Africa, the geology of Liberia is poorly known and there has been very little systematic exploration carried out for most commodities other than gold, iron ore and diamonds since the 1960s and 1970s. Further detailed field and laboratory investigations using modern techniques are required to properly evaluate the potential for the occurrence of economic deposits of many minerals and metals in a variety of geological settings. Digital geological, geochemical, geophysical and mineral occurrence datasets, including new national airborne geophysical survey data, provide a sound basis for the identification of new exploration targets, but in almost every part of the country there is a need for new and more detailed geological surveys to underpin mineral exploration.

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A new metamorphic constraint for the Eburnean orogeny from Paleoproterozoic formations of the Man shield (Aribinda and Tampelga countries, Burkina Faso)

Cited by 58 publications

References 46 publications

Structure and emplacement of granite plutons in the Paleoproterozoic crust of Eastern Burkina Faso: rheological implications

Structure and emplacement of granite plutons in the Paleoproterozoic crust of Eastern Burkina Faso: rheological implications

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

A review of the mineral potential of Liberia

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