Juvenile Paleoproterozoic crust evolution during the Eburnean orogeny (∼2.2–2.0Ga), western Burkina Faso

Baratoux, Lenka; Metelka, Václav; Naba, Séta; Jessell, Mark; Grégoire, Marilaure; Ganne, Jérôme

doi:10.1016/j.precamres.2011.08.010

Cited by 235 publications

(256 citation statements)

References 90 publications

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“…Moreover, comprehensive and integrated research studies by WAXI (2013) have convincingly demonstrated that the deposition of the lower Birimian Supergroup in an oceanic arc to back arc setting was followed by local micro-plate accretion during the Tangaean/Eoeburnean/Eburnean I at approximately 2.20-2.15 Ga (Tshibubudze et al, 2009;Hein, 2010;Baratoux et al, 2011;Metelka et al, 2011;. This was followed by polycyclic deformation in the Eburnean Orogeny (Eburnean II) at approximately 2.14-2.08 Ga (Milési et al, , 1992Boher et al, 1992;Taylor et al, 1992).…”

Section: Regional Settingmentioning

confidence: 99%

The relative and absolute chronology of strato-tectonic events in the Gorom-Gorom granitoid terrane and Oudalan-Gorouol belt, northeast Burkina Faso

Tshibubudze

Hein

McCuaig

2015

Journal of African Earth Sciences

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Section: Regional Settingmentioning

confidence: 99%

The relative and absolute chronology of strato-tectonic events in the Gorom-Gorom granitoid terrane and Oudalan-Gorouol belt, northeast Burkina Faso

Tshibubudze

Hein

McCuaig

2015

Journal of African Earth Sciences

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“…The intruded granitoids in the BM domain locally yield ages between 2195 and 2172Ma (Hirdes et al, 1992;Baratoux et al, 2011;Sakyi et al, 2014). Several generations of main magmatic pulses took place later, ranging between 2153 and 2068 Ma (Hirdes et al, 1996;Egal et al, 2002;Gasquet et al, 2003;Baratoux et al, 2011;Block et al, 2015). 10…”

Section: Geological Settingmentioning

confidence: 99%

3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

Feng

Wang

Ganne

et al. 2018

Preprint

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Abstract. High-grade tectono-metamorphic domains in the Sefwi terrane of Ghana are separated from adjacent low-grade greenstone belts by two main shear zones. The high-grade rocks are thought to have been exhumed along sinistral shear zones during the D2 ENE-WSW transtension. To better understand the role boundary conditions and the spatial relationship of faults play in the re-distribution of partially molten lower crust, ten 3D thermo-mechanical models have been constructed.The results show that the normal component of velocity boundary conditions mainly controls the exhumation of the lower 15 crust which occurred along pre-existing faults, while the exhumation in the relay zones between faults is controlled by the ratio of extension rate to shear rate applied at the boundaries. The strike of the exhumation belt made of partially molten lower crust rocks in the relay zone is sub-orthogonal to the transtension direction. The isostatic compensation from lowdensity upper mantle to overlying crust (thinning) is higher under transtension than under extension. 20The lower crust exhumation influenced by inherited shear zones can be used to better understand the loci of the high-grade rocks in the Sefwi terrane. We suggest that the Kukuom-Juaboso domain composed of up to amphibolite-migmatite facies probably resulted from the concentration of partially molten rocks in the relay zone between the Ketesso and Kenyase shear zones during the D2 ENE-WSW transtension. The two shear zones probably underwent two main stages for growth and maturation from the D1 to D2 deformation phases. The regional exhumation of the high-grade rocks in the Sefwi terrane 25 probably occurred within a duration of less than 5Ma.

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“…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. The Birimian volcano-sedimentary belts have been dated between c. 2250 and 2100 Ma (Feybesse et al, 2006;Parra-Avila et al, 2016), and the granitoids were emplaced between c. 2200 and 2070 Ma (Baratoux et al, 2011;Tapsoba et al, 2013;Eglinger et al, 2017). These granitoids have widely variable isotopic compositions, reflecting varied crust and mantle sources (Eglinger et al, 2017).…”

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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Juvenile Paleoproterozoic crust evolution during the Eburnean orogeny (∼2.2–2.0Ga), western Burkina Faso

Cited by 235 publications

References 90 publications

The relative and absolute chronology of strato-tectonic events in the Gorom-Gorom granitoid terrane and Oudalan-Gorouol belt, northeast Burkina Faso

The relative and absolute chronology of strato-tectonic events in the Gorom-Gorom granitoid terrane and Oudalan-Gorouol belt, northeast Burkina Faso

3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

A review of the mineral potential of Liberia

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