WildSky's Projects in Nigeria. Nigeria is situated within the Pan-African Mobile Belt and sandwiched between the West African Craton to the west and the Saharan Metacraton to the north and to the southeast. The geology of Nigeria was divided into three major petrological components – Precambrian Basement Complex (≥ 600 Ma), Jurassic Younger ...
اقرأ أكثرA large proportion of the African Crust yields Pan-African radiometric ages (650-450 Ma). The Pan-African domains form a network of mobile belts surrounding cratons which remained relatively stable, cool and undeformed. The crust in the Pan-African domains had a similar previous history to that in the cratons. There is
اقرأ أكثرA large composite calc‐alkaline batholith, in the Iforas region, Mali, occurs close to the Pan‐African suture between the 2000 Ma old West African craton and the Trans‐Saharan mobile belt. Its locati...
اقرأ أكثرPan-African belts of the African mainland and the Arabian-Nubian Shield exhibit evolutionary features which are either compatible with intracontinental ensialic development or with plate margin and Wilson cycle tectonics. Some of these belts are discussed and, considered together, they appear to reflect variations in crustal mobility during a transitional tectonic regime from intraplate to ...
اقرأ أكثرThe 671 ± 12 Ma age of MSDZ015 and its geochemical features are similar to those of zircons grown in equilibrium with garnet, which shows that this syngenetic zircon was crystallized in a garnet-rich rock during Middle Neoproterozoic event, probably the Pan-African orogeny, which affected the …
اقرأ أكثرSeveral late-collision and intraplate features are not entirely integrated in the classical plate tectonic model. The Pan-African orogeny (730–550 Ma) in Saharan Africa provides some insight into the contrasting behaviour of cratons and mobile belts. Simple geophysical considerations and geological observations indicate that rigidity and persistence of cratons are linked to the presence of a ...
اقرأ أكثرThe surrounding Pan-African mobile belts, characterized by a much thinner mechanical boundary layer and more radioactive crust, were the locus of A-type granitoids, volcanism, tectonic reactivation and basin development during the Phanerozoic. During oceanic closures leading to the assembly of Gondwana, lithosphere behaviour was controlled by ...
اقرأ أكثرThe objective of this work is to study the influence of the pan African mobile belt and the oceanic plate on the functioning of the different units of the Congo Craton (Ntem, Ayina, Bas Nyong, [20]), located between the Pan-African chain and the ocean. Atlantic), based on magnetotelluric soundings and associated statistical processing [21], [22 ...
اقرأ أكثرThe Zambezi belt makes up part of the Late Proterozoic (Pan-African) network of orogenic belts in southern Africa. In Zambia, supracrustal rocks within the Zambezi belt are in contact with two extensive units of granitic augen gneiss, which have previously been …
اقرأ أكثرIn the Neoproterozoic, Ghana was affected by the Pan-African orogeny. Today, the Pan-African mobile belt terrane spans eastern and southeastern Ghana, with several different units. The Dahomeyan System comprises both mafic and felsic gneiss while the Togo Series includes quartzite, shale and small amounts of …
اقرأ أكثرPan-African Rokelide Belt (Williams & Culver, 1988). The Archean rocks of the Reguibat Shield include TTG-type migmatitic orthogneiss and metavolcanic and metasedimentary belts with ironstones, marbles, ultramafic rock, and amphibolite (e.g. Tasiast belt, Amsaga area in Mauritania), greywacke and pelite.
اقرأ أكثرHistory and terminology. The term Pan-African was coined by Kennedy 1964 for a tectono-thermal event at about 500 Ma when a series of mobile belts in Africa formed between much older African cratons.At the time, other terms were used for similar orogenic events on other continents, i.e. Brasiliano in South America; Adelaidean in Australia; and Beardmore in Antarctica.
اقرأ أكثرThe evolution of the Nigerian basement, which lies within the Pan-African mobile belt to the east of the West African Craton, is discussed in the light of the new data from some critical areas of the basement. The Nigerian basement can be divided into two provinces: (1) the Western Province, approximately west of latitude 8°E, is characterised ...
اقرأ أكثرThe Pan-African Mobile Zone. The Pan-African Dahomeyide Belt is located on the southeastern margin of the West-African Craton (Figures 1 and 2). It comprises different lithostructural units in the West (external structural units) or in the East (internal structural units), ...
اقرأ أكثرThe CAFB, also known as the Pan-African North Equatorial Fold Belt, is a major collisional belt that underlies the region from the West African Craton to East Africa (Ngnotué et al., 2000;Nzenti ...
اقرأ أكثرThe Pan-African orogeny was accompanied by intense metamorphism during which some of the old cratonic margins were remobilised. These Neo-Proterozoic mobile belts include the Tibisti, Trans-Saharan, Anti-Atlas and Mauritanide belts, and the Arabian-Nubian shield (Figure 2.4) . 9
اقرأ أكثرstage of deformation in mobile belt between the East- and West-Gondwana supra terrains. Furthermore, the relatively high magnetic anomalies of the LHC compared with surrounding terrains (Golynsky et al., 1996) indicate the LHC lies in one of the major sutures of the Pan-African mobile belt. These have been
اقرأ أكثرThe surrounding Pan-African mobile belts, characterized by a much thinner mechanical boundary layer and more radioactive crust, were the locus of A-type granitoids, volcanism, tectonic reactivation and basin development during the Phanerozoic. During oceanic closures
اقرأ أكثرThe Iwaraja area constitutes part of the Ilesha schist belts in southwestern part of the Nigerian Basement Complex, a part of the African crystalline shield. This particular schist belt has been recognized as a Pan -African ensialic mobile belt derived from an aulacogen, and is connected with the ocean [1] -[4] .
اقرأ أكثرU.S. Geological Survey and The National Academies; USGS OF-2007-1047, Extended Abstract 180 Deep seismic reflection imaging of the Pan-African mobile belt, the Lützow-Holm Complex, East Antarctica M. Kanao,1 A. Fujiwara,2 H. Miyamachi,3 K. Ito,4 and T. Ikawa2 1 National Institute of Polar Research, Research Organization of Information and Systems, 1-9-10 Kaga, Itabashi-ku, Tokyo, 173 …
اقرأ أكثرGeodynamic evolution of the Central Saharan Pan-African mobile belt: a new interpretation of the Hoggar shield (Algerian Sahara). Geologische Rundschau 67, 357 –88. CrossRef Google Scholar
اقرأ أكثرPan-African mobile belts. Despite superficial cover, which obscures deeper tectonic relationships, the Damara Belt appears to link up, in a northeast direction, with the Pan-African Katangan/Lufilian Arc system of Central Africa. The orogen can be divided into a number of distinct zones on the basis of stratigraphy, structure, metamorphic grade
اقرأ أكثرCratons, mobile belts, alkaline rocks and continental lithospheric ...
اقرأ أكثرNew petrological and metamorphic constraints from three Pan-African mobile belts across the main collisional suture zone that separates East and West Gondwana are presented. These include: (a) the Wadi Kariem area in Eastern Desert of Egypt, (b) the Wadi Taba-El-Kid in Sinai, Egypt and (c) Western Dronning Maud Land, East Antarctica. The metamorphic results from these three terrains are ...
اقرأ أكثرEvidence of Major Structural Features over the Pan-African Domain in the Bertoua-Mbangue Area (East Cameroon) from a Multiscale Approach of Modeling and Interpretation of ... channel between the Pan-African Mobile Belt (PAMB) of CentralAfricaandtheCongoCraton.u s,theNortheastern
اقرأ أكثرPan-African orogeny geology Britannica. In Africa: General considerations mobile-belt formation known as the Pan-African episode (about 950 to 550 million years ago), which generated long fold belts, such as the Mozambique belt along the east coast of Africa, the Damara and Katanga belts extending from Namibia into the Democratic ...
اقرأ أكثرdeep seismic reflection imaging pan-african mobile belt nmo correction crust-mantle boundary deep seismic survey tzow-holm complex pan-african terrain maud land ds data upper mantle several crustal reflection west gondwana super-terrains crustal structure east antarctica tectonic influence cdp stacking broad mobile belt seismic reflection last ...
اقرأ أكثرIntracrustal recycling and upper-crustal evolution: A case study from the Pan-African Damara mobile belt, central Namibia. Chemical Geology, 1990. Frank McDermott. C. Hawkesworth. Frank McDermott. C. Hawkesworth. Download PDF. Download Full …
اقرأ أكثرThe RTE map shows a contrast that is assimilated to a channel between the Pan-African Mobile Belt (PAMB) of Central Africa and the Congo Craton. Thus, the Northeastern part characterized by the positive anomaly values seems to correspond to the PAMB, while the Western part constituted by negative anomalies would mark the Craton Congo.
اقرأ أكثرwithin the Pan African mobile belt in between the West African and Congo cratons. The Geology of Nigeria is dominated by crystalline and sedimentary rocks both occurring approximately in equal proportions (Woakes et al 1987). The crystalline rocks are made up of Precambrian basement complex and the Phanerozoic rocks which occur in the eastern
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