Transcurrent tectonics and polycyclic evolution in the lower proterozoic of Senegal-Mali

Ledru, Patrick; Pons, J.; Milési, Jean Pierre; Feybesse, Jean-Louis; Johan, V.

doi:10.1016/0301-9268(91)90028-9

Cited by 99 publications

(80 citation statements)

References 23 publications

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“…The D2 phase was interpreted as transcurrent deformation along a network of ductile shear zones (Milesi et al, [12], Ledru et al, [15]) and corresponds to transpression accommodating the emplacement of the Laminia Kaourou Plutonic complex (LKPC) (Gueye,[16]). It has been long postulated that the elongated shape of most of the intrusions was due to syntectonic emplacement in relation with the activity of the shear zones (Pons [17], Gueye et al [18]).…”

Section: The Kedougoukenieba Inlier (Kki)mentioning

confidence: 99%

Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Diène¹,

Gueye²,

Diallo³

et al. 2012

IJG

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The western part of the Kedougou Kenieba Inlier is located in the West African Craton. It consists of paleoproterozoic NE-trending elongate belts (subprovinces) of metavolcanic and granitic rocks that alternate with metasedimentary belts. Major linear fault such as the MTZ which also approximate a north-easterly trend form the eastern boundaries. The field observations and geophysics analyses were completed by a microscopic study. Based on these data we define across this region four lithostructural domains from east to west. The western domain is structurally complex. The rocks of this domain have been subjected to a complex history of polyphase deformation and metamorphism. The structural analyse allow us to distinguished three deformation events. The deformation results in the formation of D1 thrust tectonic and D2 and D3 transcurrent tectonic. The structural evolution of the Mako Belt is characterized by deformation dominated by the intrusion of large TTG batholiths (D1) followed by basins formation and transpression accommodating oblique convergence and collision (D2 and D3). The change from thrusting (D1 deformation to transcurrent motion (D2 and D3) is recorded in the marginal basin of the central domain and in Tinkoto pull apart basin. The timing of these basins indicates a diachronous evolution. Deformation styles within the basin are compatible with a dextral transpression which terminated at ca 2090 Ma. Small extensional basins formed over the rocks of the Mako Belt are filled with continental detrital sedimentary rocks that show weak foliation and active felsic volcanism. We suggest that the sinistral transpressive tectonic associated with oblique subduction may have generated the pull-apart basin and subaqueous volcanism. In part these features are now related to terrain accretion, thrusting and strike slip movement during oblique convergence. The inversion of the large scale structural evolution from thrusting to strike slip is common to modern orogenies.

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Section: The Kedougoukenieba Inlier (Kki)mentioning

confidence: 99%

Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Diène¹,

Gueye²,

Diallo³

et al. 2012

IJG

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show abstract

“…According to Junner (1940), Milési et al (1992), Ledru et al (1991), Feybesse and Milési (1994) and Ndiaye et al (1997), the metasedimentary series of the belts are from the Lower Birimian. On the other hand, Bassot (1966), Pouclet et al (1996) and Béziat et al (2000) propose that the bimodal volcanism underlay the metasediments.…”

Section: Introductionmentioning

confidence: 99%

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

Dioh

Béziat

Debat

et al. 2006

Journal of African Earth Sciences

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“…The presence of reworked pebbles of Birimian origin in the lowermost member of the Tarkwaian sequence (the Kawere conglomerate) is cited as evidence of this age gap (Kitson, 1928;Whitelaw, 1929;Asihene and Barning, 1975;Kesse, 1976). • The above classification conflicts with the one proposed by geologists in neighbouring French-speaking West African countries like La Côte d'Ivoire, Burkina Faso, Guinea and Mali where the trend is generally from a volcanic-dominated lower unit (B1) to a clastic-dominated upper sequence (B2) with the Tarkwaian as an integral part (the Molasse phase) of the Upper Birimian (Rouques, 1948;Tagini, 1971;Papon, 1973;Hottin and Ouedraogo, 1975;Ledru et al, 1991).…”

Section: Regional Birimian Settingmentioning

confidence: 81%

The mineralogy and petrography of the ferruginous manganese rocks at Mankwadzi, Ghana

Dzigbodi-Adjimah

2004

Journal of African Earth Sciences

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Transcurrent tectonics and polycyclic evolution in the lower proterozoic of Senegal-Mali

Cited by 99 publications

References 23 publications

Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)

Diversity of the Palaeoproterozoic granitoids of the Kédougou inlier (eastern Sénégal): Petrographical and geochemical constraints

The mineralogy and petrography of the ferruginous manganese rocks at Mankwadzi, Ghana

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