Palaeotectonic setting of the south-eastern Kédougou-Kéniéba Inlier, West Africa: New insights from igneous trace element geochemistry and U-Pb zircon ages

Abstract

Please cite this article as: Lambert-Smith, J.S., Lawrence, D.M., Müller, W., Treloar, P.J.,Palaeotectonic setting of the south-eastern Kédougou-Kéniéba Inlier, West Africa: new insights from igneous trace element geochemistry and U-Pb zircon ages, Precambrian Research (2015), http://dx.doi.org/10. 1016/j.precamres.2015.10.013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

New U–Pb zircon ages of Nyong Complex meta‐plutonites: Implications for the Eburnean/Trans‐Amazonian Orogeny in southwestern Cameroon (Central Africa)

“…As implicit in its name, this orogeny spans, like the Pan‐African/Brasiliano orogen, the Atlantic Ocean (e.g., Feybesse et al, 1998; Ledru, Johan, Milési, & Tegyey, 1994; Lerouge et al, 2006; Trompette, 1994). It encompasses the whole WCAFB (e.g., Feybesse et al, 1998; Lerouge et al, 2006; Loose & Schenk, 2018; Toteu et al, 1994), its South American equivalents, such as the Eastern Bahia and Mineiro belts (e.g., Aguilar et al, 2017; Alkmim & Wilson, 2017; Barbosa & Barbosa, 2017; Carvalho, Janasi, & Sayer, 2017), and its West African counterparts, the Ashanti‐Kumasi, Houndé, Lawra, Kédougou, Ouago‐Fitini, and Reguibat belts (e.g., Kouamelan et al, 1997; Lambert‐Smith et al, 2015; Parra‐Avila et al, 2017; Peucat et al, 2005).…”

“…Similarly, the gneissic basement of the Palaeoproterozoic West African belts is older than ∼2,700 Ma (U–Pb zircon; Kouamelan et al, 1997; Peucat et al, 2005). Lambert‐Smith et al (2015) described monzodiorites with Palaeo‐ to Mesoarchean U–Pb zircon crystallization ages (3,380–3,000 Ma), among the oldest crustal pieces recognized so far in West Africa.…”

“…Lambert- Smith et al (2015) described monzodiorites with Palaeo-to Mesoarchean U-Pb zircon crystallization ages (3,380-3,000 Ma), among the oldest crustal pieces recognized so far in West Africa.…”

“…It stretches across Cameroon, the Central African Republic, Equatorial Guinea, and Gabon, forming the West Central African Fold Belt (WCAFB; Boniface, Schenk, & Appel, 2012; Houketchang Bouyo, Pénaye, Mouri, & Toteu, 2019; Feybesse et al, 1998; Loose & Schenk, 2018; Nga Essomba et al, 2019; Thiéblemont, Callec, Fernandez‐Alonso, & Chène, 2018). Units equivalent to the Nyong Complex were mapped around the West African Shield, notably the Ashanti‐Kumasi, Houndé, Lawra, Kédougou, Ouago‐Fitini, and Reguibat belts (Kouamelan, Delor, & Peucat, 1997; Lambert‐Smith, Lawrence, Müller, & Treloar, 2015; Parra‐Avila et al, 2017; Peucat, Capdevila, Drareni, Mahdjoub, & Kahoui, 2005), and around the São Francisco Shield in Brazil, comprising the Eastern Bahia and Mineiro belts (Figure 1a; e.g., Aguilar et al, 2017; Alkmim & Wilson, 2017; Barbosa & Barbosa, 2017; Lopez, Cameron, & Jones, 2001; Neves et al, 2006).…”

Source and deposition age of the Dialé-Daléma metasedimentary series (Kédougou-Kéniéba Inlier, Senegal) constrained by U–Pb geochronology on detrital zircon grains

“…Calc-alkaline volcanic-plutonic rocks, referred to as the Falémé metavolcanic belt, crop out east of the Dialé-Daléma series (Hirdes and Davis 2002, Lawrence et al 2013, Lambert-Smith et al, 2016, Masurel et al, 2017 and are considered as corresponding to a paleogeographic domain different from the Dialé-Daléma series. The geology of the Falémé metavolcanic belt consists of syntectonic granitoids such as Balangouma and Boboti pluton (Ndiaye et al, 1997, Hirdes andDavis, 2002) dated at 2112 ± 13 Ma and ± 9 Ma, respectively (Lambert-Smith et al, 2016). Inherited zircons in the Boboti pluton indicate that the early magmatic activity in the Falémé belt occurred at 2218 ± 83 Ma synchronous with the oldest dated units in the Mako belt to the west.…”