However, in West Africa it has been shown that the geological evolution of the late Proterozoic Pan African mobile belt passed through a com- plete Wilson cycle, ending in a collision between a passive continental margin and an active one (Black, 1978; Black et ai-, 1979). In Central Africa, two conflicting models of geodynamic evolution have ...
The Pan-African Trans-Saharan belt, resulting from oceanic closure and oblique collision between the West-African Craton and the Tuareg-Nigerian shields around 600 Ma ago, displays in the Iforas a rapid switch from subduction and collision related calc-alkaline magmatism to typical A-type granitoids (560-540 Ma).
Pan-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
2.6.3 Location of the Pan-African Mobile Belt If the Anti-Atlas represents the northern boundary of the WAC metacratonized during the Pan-African orogeny, the true Pan-African mobile belt existed just to the north and west, consisting mostly of peri-Gondwanan terranes which drifted away later, during the Phanerozoic. ...
The Proterozoic Eastern Ghats Mobile Belt along the east coast of India shares a thrusted lower contact with the surrounding cratons. ... McWilliams, 198 1) . In Africa, the main tectonic belt of Pan-African age is the Mozambique Belt which probably resulted from the closure of a major Late Proterozoic ocean during the Pan-African orogeny ...
Pandyan Mobile Belt (PMB) is the name given by Ramakrishnan (1993, 1988) to the Southern Granulite Terrain (SGT) situated to the south of the E-W trending Palghat-Cauvery Shear Zone (PCSZ) (Fig. 8.1). ... Recently, Pan-African ages have been reported from the Madurai Block. Rb-Sr age of 550 ± 15 Ma is reported from Madurai gneisses (Hensen et ...
Generally, the West African craton is bounded to the east and southwest by Pan-African mobile belts. Outcrops of the Birimian terminate against the Liberian cratonic nucleus in western Ivory Coast. In southeast Ghana, the Pan-African orogeny has thrusted the Dahomeyan gneisses over the Birimian terrain. There are two schools of thoughts on the ...
The western part of the Pan-African Damara Orogen in Namibia is located at the intersection of two highly oblique mobile belts: the coastal NNW-trending Kaoko-Gariep belts and the inland NE-trending Damara Belt. The Namibfontein-Vergenoeg (NV) domes are two, basement-cored, migmatite domes exposed in this orogenic intersection.
The 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
DOI: 10.1016/0301-9268(77)90040-7 Corpus ID: 129436875; The intracratonic branch of the Damara Orogen in South West Africa II. Discussion of relationships with the Pan-African mobile belt system☆
The 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 ...
In this article, we report the first evidence for a significant Pan-African metamorphic event in the SCB. The results provide robust constraints on the location of the …
Pan-African mobile belt situated be tween the Archean-Paleoproteroz oic b locks of the West Afri can and Congo . cratons (Fig.1). The basement com plex is considered to.
A 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 …
The surrounding Pan-African mobile belts, characterized by a much thinner mechanical boundary layer and more radioactive crust, were the locus of A-type granitoids, ... values for the Pan-African belts (60-70mWm -2) compared to cratons (40mWm -2) can also be modelled in terms of litho- spheric thickness. ...
The Damara mobile belt in the south-western kaokovelt, South West Africa; Y. Hasui et al. The Ribeira folded belt. Rev. Bras. Geociencias ... The Upper Proterozoic Pan-African belts of Africa and Brasiliano belts of South America are assumed to have evolved from an elaborate system of continental rifts which formed on the West Gondwana ...
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 . 2. Geological Setting
The Nigerian Basement Complex is also a part of the Pan African mobile belt that lies between the West African Craton to the east and the Congo Craton to the southwest within the African continent ...
The other type of mobile belt generally contains polydeformed high-grade metamorphic assemblages, exposing middle to lower crustal levels, whose origin, environment of formation and structural evolution are more difficult to reconstruct. ..., followed by anatectic doming and wrench faulting. Pan-African Belt in Central Africa (Cameroon, Chad ...
The basement complex is one of the three major litho-petrological components that make up the geology of Nigeria (Fig. 1.1). The Nigerian basement complex forms a part of the Pan-African mobile belt and lies between the West African and Congo Cratons (Fig. 1.2) and south of the Tuareg Shield (Black, 1980).
U/Pb zircon geochronology of the southern part of the Nabitah mobile belt and Pan-African continental collision in the Saudi Arabian Shield January 1, 1985 View Document. No abstract available. Citation Information. Publication Year: 1985: Title:
2.6.3 Location of the Pan-African Mobile Belt If the Anti-Atlas represents the northern boundary of the WAC metacratonized during the Pan-African orogeny, the true Pan-African mobile …
They are contained within the Pan-African belt of the Arabian Shield, whose axial zone is represented by the Nabitah belt, described above. Uplift of the high-grade gneisses occurred by transpression before the deposition of the Bani Ghayy group, that is, before 620 Ma, and before or during the formation of the Murdama basins (670 to 630 Ma ...
Pan-African deformation in the Zambezi Belt appears to be dominated by the development of domes and periclines cored by gneiss, whose growth has swept aside the overlying meta-sediments and ...
The Pan-African Damara Mobile Belt has previously been described as ensialic, possibly resulting from a modified aulacogen. Three features of the Damara Mobile Belt are difficult to reconcile with ensialic models. Firstly, the complex asymmetrical structural pattern of linear zones, with up to 80% shortening across the belt. Secondly, the ...
Pan-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 …
These rocks, together with the basement, were caught up at ∼538 Ma in Pan-African thrusts, transcurrent shear zones and folds in an intracontinental environment. These new data allow a reassessment of the entire Mozambique Belt, until now regarded as a Pan-African mobile belt involving variably remobilized cratons.
In Namibia there is a junction between a Pan-African age (65050 m.y.) erogenic system which follows the western rim of Africa and an ENE-trending arm which branches off …
The heat flow density is low in the stable Archean nuclei (30–40 mW m−2) and increases to 50–60 mW m−2 in the surrounding mobile belts affected by the Pan-African orogeny (600 Ma).
'African Geology' refers to the geological composition of Africa, which is predominantly made up of Precambrian rocks with some Phanerozoic mountain belts. The continent is structurally divided into cratons and mobile belts, with significant tectonic events like the Pan-African orogeny shaping its geological history.
The great north--south extent of mobile belts of pan-African age in Africa and also in South America suggests some kind of global control and raises the question of how far the …