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Birimian
The Birimian rocks are major sources of gold and diamonds that extend through Ghana, Côte d'Ivoire, Guinea, Mali and Burkina Faso. They are named after the Birim River, one of the main tributaries of the Pra River in Ghana and the country's most important diamond-producing area. Ghana and Mali are the second and third largest producers of gold in Africa, respectively. The Birimian terranes in the southern part of the West African craton are a mix of metamorphosed volcanic, sedimentary, and plutonic rocks and low-grade metavolcanics and metasediments. Almost half of the terranes consist of alkaline granites. The rocks formed over a period of about 50 million years between 2.200 Ga and 2.100 Ga years ago. Location The Birimian rocks stretch across the countries to the north of the Gulf of Guinea, forming parallel belts that generally trend northeasterly and are wide and about apart. They consist of interlayered sedimentary and volcanic flow rocks metamorphosed to l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West African Craton
The West African Craton (WAC) is one of the five cratons of the Precambrian basement rock of Africa that make up the African Plate, the others being the Kalahari craton, Congo craton, Saharan Metacraton and Tanzania Craton.Jessell M.W., Liégeois J-P. (2015). "100 years of research on the West African Craton". ''Journal of African Earth Sciences''. 112(B): 377– 381. Cratons themselves are tectonically inactive, but can occur near active margins,Ennih N. & Liégeois J-P. (2008). ''The Boundaries of the West African Craton''. Geological Society, London, Special Publications. 297: 1–17. with the WAC extending across 14 countries in Western Africa, coming together in the late Precambrian and early Palaeozoic eras to form the African continent. It consists of two Archean centers juxtaposed against multiple Paleoproterozoic domains made of greenstone belts, sedimentary basins, regional granitoid- tonalite-trondhjemite-granodiorite (TTG) plutons, and large shear zones. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Man Shield
The Man Shield (Leo-Man Shield or Leo-Man Craton) is a geological shield or craton in the southeast portion of the West African Craton. The shield is in part overlaid by gold-bearing Birimian formations. Geography and Geology The shield covers the countries Ivory Coast, Mali, Burkina Faso, Ghana, Sierra Leone, Liberia, and Guinea.Jessell M.W., Liégeois J-P. (2015). "100 years of research on the West African Craton". ''Journal of African Earth Sciences''. 112(B): 377– 381. this shield, a large portion of the WAC consists of Paleoproterozoic Birimian continent margins.Ennih N. & Liégeois J-P. (2008). ''The Boundaries of the West African Craton''. Geological Society, London, Special Publications. 297: 1–17. The Birimian units were initially produced in an immature volcanic arc setting, which was later metamorphosed during the Eburnean orogeny. The poor ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tarkwa, Ghana
Tarkwa is a town and is the capital of Tarkwa-Nsuaem Municipal district, a district in the Western Region southwest of South Ghana. Frequently dubbed as the "Golden City" by its indigenous populace, the region is characterized by a rich tapestry of Fante communities, among which include Efuanta, Tamso, Aboso, Akoon, Nzemaline, and Kwabedu. Tarkwa has a population of 218,664 people according to 2021 settlement. Economy Mining Tarkwa is noted as a centre of gold mining and manganese mining. Tarkwa Mine, which is a large open-cast gold mine, is situated to the northwest of the town, and Nsuta manganese mine is situated to the east of the town. Tarkwa Mine mines several low-grade conglomeratic "reefs" of Tarkwaian type. These reefs are of mid-Proterozoic age. A number of mining companies cluster between the villages of Aboso and Tamso in the late 19th century. Tarkwa Mine has the distinction of being one of the largest gold mines in South Ghana. Approximately 24 tons of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granites
Granite ( ) is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or '' granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. Granite is nearly alw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craton
A craton ( , , or ; from "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates; the exceptions occur where geologically recent rifting events have separated cratons and created passive margins along their edges. Cratons are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots extending several hundred kilometres into Earth's mantle. Terminology The term ''craton'' is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons are composed of two layers: a continental '' shield'', in which the basement rock crops out at the surface, and a '' platform'' which o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archean
The Archean ( , also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history of Earth, history, preceded by the Hadean Eon and followed by the Proterozoic and the Phanerozoic. The Archean represents the time period from (million years ago). The Late Heavy Bombardment is hypothesized to overlap with the beginning of the Archean. The Huronian glaciation occurred at the end of the eon. The Earth during the Archean was mostly a ocean world, water world: there was continental crust, but much of it was under an ocean deeper than today's oceans. Except for some rare Relict (geology), relict crystals, today's oldest continental crust dates back to the Archean. Much of the geological detail of the Archean has been destroyed by subsequent activity. The Earth's atmosphere was also vastly different in atmospheric chemistry, composition from today's: the prebiotic atmosphere was a reducing atmosphere rich in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaya, Burkina Faso
Kaya is the fifth largest city in Burkina Faso, lying northeast of Ouagadougou, to which it is connected by railway. It is a centre for weaving and tanning. Kaya is the capital of Sanmatenga Province. It is located from Ouagadougou, the capital of Burkina Faso. Demographics Kaya has a population of 121,970 (2019 census). Population growth: Infrastructure Kaya Airport is a public airport in Kaya. As of 2014 it did not have any scheduled commercial flights. In 1988 Kaya was connected by railway to OuagadougouHistorical Dictionary of Burkina Faso, by Lawrence Rupley, Lamissa Bangali, Boureima Diamitani, 2013, third edition, Scarecrow Press, Inc. but, as of 2014, there were no passenger services available. Kaya is a road junction for the N3 and N15 national highways that link the city with Dori, Ouagadougou and Pouytenga, Boulsa, Kongoussi and Ouahigouya, respectively. Education *technical college for girls *secondary school Climate Köppen-Geiger climate class ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ouahigouya
Ouahigouya () is a city in northern Burkina Faso, situated 182 kilometres northwest of Ouagadougou. It is the capital of the Yatenga Province and one of its subdivisions the Ouahigouya Department. It is also the biggest town in the Nord Region (Burkina Faso), Nord Region and the fourth largest city in the country with a population of 124,587 (2019) The city itself has a stadium, a private non-profit Paediatric Hospital with 36 beds for giving birth and 24 beds for children suffering of severe malnutrition, a post office with internet access and at least one Ecobank bank branch. History The city was founded in 1757 as the capital of Yatenga one of a number of Mossi Kingdoms. The city still bears testimony to its role as capital of the Yatenga Kingdom in its name, the meaning of which is ''come and prostrate yourselves''. In the Christmas War of 1985, the city's marketplace was bombed by Malian forces, almost 100 people being killed. Economy Mainly of an agriculturally based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boromo
Boromo is a town in the Boromo Department of Balé Province in Burkina Faso. It is the capital of both the department and the province, and it has a population of 20,193 (2019). Boromo is located directly between the two major cities of Burkina Faso, Ouagadougou and Bobo-Dioulasso. It is a city with many natural resources, including gold and fish. The major activity in this zone is agriculture. Boromo is a "melting pot" where you will find many ethnic groups, including Mossi, Dioula, Dafing, Bobo Bobo may refer to: Arts, entertainment and media Comic strips * ''Bobo'' (Belgian comics) * ''Bobo'' (Italian comics) * ''Bobo'' (Swedish comics) Fictional characters * Bobo the Bear, in ''The Muppets'' series * Professor Bobo, from ''My ... and Winiens (or Kos). Climate See also * 2008 Burkina Faso bus crash * Railway stations in Burkina Faso References External links Satellite map at Maplandia.comBBC article about the 2008 road crash Populated places in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poura
Poura is a town in the Poura Department of Balé Province in southern Burkina Faso Burkina Faso is a landlocked country in West Africa, bordered by Mali to the northwest, Niger to the northeast, Benin to the southeast, Togo and Ghana to the south, and Ivory Coast to the southwest. It covers an area of 274,223 km2 (105,87 .... The town has a population of 6,266 and is the capital of Poura Department. References External links Satellite map at Maplandia.com Popul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Houndé
Houndé is a city located in the Provinces of Burkina Faso, province of Tuy Province, Tuy (of which it is the capital) in the Hauts-Bassins Region of Burkina Faso. It is situated about east by northeast of Bobo-Dioulasso along the trunk road Route Nationale N1 to Ouagadougou. Houndé is the site of Houndé Mine, a major Gold mining, gold mine that is mostly owned by Endeavour Mining. References Populated places in the Hauts-Bassins Region {{Tuy-geo-stub Tuy Province ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenstone Belt
Greenstone belts are zones of variably metamorphosed mafic to ultramafic volcanic sequences with associated sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies. The name comes from the green hue imparted by the colour of the metamorphic minerals within the mafic rocks: The typical green minerals are chlorite, actinolite, and other green amphiboles. Greenstone belts also often contain ore deposits of gold, silver, copper, zinc, and lead. A greenstone belt is typically several dozens to several thousand kilometres long. Typically, a greenstone belt within the greater volume of otherwise homogeneous granite-gneiss within a craton contains a significantly larger degree of heterogeneity and complications and forms a tectonic marker far more distinct than the much more voluminous and homogeneous granites. Additionally, a greenstone belt contains far more information on tectonic and metamorphic events, deformations, and paleogeologi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
