Terrane assembly and geodynamic evolution of central–western Hoggar: a synthesis

Caby, Renaud

doi:10.1016/j.jafrearsci.2003.05.003

Cited by 241 publications

(170 citation statements)

References 60 publications

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“…1) is a linear belt that extended for more than 4,000 km from present-day northeast Africa to Central Brazil 22,23 . Modern and traditional views suggest that this orogen resulted from the consumption and closure of the Goiás-Pharusian Ocean [22][23][24] that culminated in a continent-continent collision involving mainly the conjoined Amazon and West African cratons against the São Francisco-Congo and Saharan cratons (Fig. 1a).…”

Section: Resultsmentioning

confidence: 99%

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

et al. 2014

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The deeply eroded West Gondwana Orogen is a major continental collision zone that exposes numerous occurrences of deeply subducted rocks, such as eclogites. The position of these eclogites marks the suture zone between colliding cratons, and the age of metamorphism constrains the transition from subduction-dominated tectonics to continental collision and mountain building. Here we investigate the metamorphic conditions and age of high-pressure and ultrahigh-pressure eclogites from Mali, Togo and NE-Brazil and demonstrate that continental subduction occurred within 20 million years over at least a 2,500-km-long section of the orogen during the Ediacaran. We consider this to be the earliest evidence of large-scale deep-continental subduction and consequent appearance of Himalayan-scale mountains in the geological record. The rise and subsequent erosion of such mountains in the Late Ediacaran is perfectly timed to deliver sediments and nutrients that are thought to have been necessary for the subsequent evolution of sustainable life on Earth.

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Section: Resultsmentioning

confidence: 99%

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

et al. 2014

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“…This area is part of the basement complex of Nigeria, which lies within the Pan-African Province of West Africa (Figure 1) between two cratons of Archaean to Lower Proterozoic ages: the West African craton to the west and the Congo craton to the southeast (Turner, 1983). The Nigerian basement represents the southern part of the TransSaharan mobile belt (Caby, 2003;Ferre et al, 2002). The Ilesha Schist Belt (ISB) is generally considered as to be relicts of a supracrustal cover which was infolded into the migmatite gneiss complex.…”

Section: Geologic Settingmentioning

confidence: 99%

Assessment of the distribution of potentially harmful trace elements in bedrocks and stream sediments of Okemesi-Ijero area, Southwestern, Nigeria

Samuel¹,

Asowata²,

Adeoti³

2018

J. Geol. Min. Res.

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“…In the central portion of Brazil, the lineament is represented by extensive shear zones and its ramifications, with dextral movement, consisting of mylonite affecting protoliths of different nature, origin and age, such as the Tocantins Shear Belt (Gorayeb 1996a, 1996b and the TSZ (Gorayeb 1996a, Dantas et al 2007. The TBL and its extension in West Africa were first recognized by Kroener & Cordani (2003), Caby (2003) and Cordani et al (2013).…”

Section: Introductionmentioning

confidence: 99%

“…The Kandi Lineament in Africa (Cordani et al 2013, Caby 2003, Kroener & Cordani 2003 is an extension of the SobralPedro II Lineament (Gama Junior et al 1988, Gorayeb and Abreu 1998, Cavalcante et al 2003, Gorayeb & Lima 2014). …”

Section: Introductionmentioning

confidence: 99%

Granulite-facies metamorphism at ca. 570-580 Ma in the Porangatu Granulite Complex, central Brazil: implications for the evolution of the Transbrasiliano Lineament

et al. 2017

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ABSTRACT:The Porangatu Granulite Complex is exposed in the central part of the Neoproterozoic Tocantins province in central Brazil, along the boundary between the Brasília Belt to the east and the Araguaia Belt to the west. This is part of the transcontinental Transbrasiliano-Kandi shear system. The complex includes garnet-rich enderbite and charnockite, high-grade gneisses as well as lenses of garnet-bearing mafic granulite or amphibolites, and in situ anatectic charnockite, elongated in the NNE-SSW direction along the Talismã Shear Zone (TSZ). These rocks represent suites of ortho-derived rocks of calc-alkaline affinity and small contributions of tholeiitic basalts and aluminous paragneisses. The structural framework records thrust components probably related to the early stages of an oblique collision during the evolution of Neoproterozoic Brasiliano orogens, and can be understood as involving a collisional system of two crustal blocks, initially with thrust components which in its final stage evolved to a transcurrent system with dextral movement. This led to intense imbrication, generation of mylonitic foliation, stretching lineation, tectonic banding and rotation of structures and minerals. The heterogeneous and progressive ductile deformation was accompanied by metamorphic re-equilibrium in late Neoproterozoic time. Granulite facies conditions reached a metamorphic maximum at temperature and pressure above 850°C and 10 kbar, in an almost anhydrous environment, with or without anatexis. Zircon U-Pb SHRIMP analyses for two selected rock samples indicated the combined age of 580 ± 7 Ma for a charnockite and 548 ± 48 Ma for a mafic granulite from which the charnockite is throught to have been derived. The mafic granulite contains zircon grains of ca. 2.1 Ga, indicating Paleoproterozoic igneous protoliths involved in Neoproterozoic high-grade metamorphism. In addition, older inherited zircon grains of ca.

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Terrane assembly and geodynamic evolution of central–western Hoggar: a synthesis

Cited by 241 publications

References 60 publications

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen

Assessment of the distribution of potentially harmful trace elements in bedrocks and stream sediments of Okemesi-Ijero area, Southwestern, Nigeria

Granulite-facies metamorphism at ca. 570-580 Ma in the Porangatu Granulite Complex, central Brazil: implications for the evolution of the Transbrasiliano Lineament

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