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• W4387651851 abstract "In this study, field descriptions of the dolerite dykes cross‐cutting the Pan‐African basement (DPB) and the dolerite and gabbroic dykes cross‐cutting the Cretaceous sedimentary basin (DGCSB) are used together with petrographic, bulk‐rock geochemistry, as well as Sr – Nd – Pb isotopic data to constrain the geodynamic setting and origin of these mafic (basanite, basalt and basaltic andesite in composition) rocks that outcrop in the Figuil–Léré area. The DPB dykes are alkaline with SiO 2 of 46.63–49.03 wt% and MgO of 3.93–7.11 wt%. In contrast, the DGCSB dykes are subalkaline with SiO 2 ranging between 50.24 and 53.16 wt% and MgO fluctuating between 5.22 and 7.90 wt%, comparable to dykes described in other regions of the Cameroon Line (CL). The rocks studied belong to the tholeiitic series and were emplaced in within‐plate basalts (WPB) and mid‐ocean ridge basalts (MORBs) setting. The variations in major and trace elements from the basanite to basaltic andesite compositions are dependable with fractional crystallization (FC) of different mineral phases such as opaque minerals, olivine, clinopyroxene, amphibole and alkali feldspar. Most samples exhibit negative Nb–Ta and positive Sr anomalies, which together with the negative correlation between MgO and 87 Sr/ 86 Sr, and isotopic ratio of 206 Pb/ 204 Pb <19.5 (18.27–19.49) suggests interactions of crustal components. Nevertheless, this contamination seems limited because there is a positive correlation between SiO 2 and 143 Nd/ 144 Nd plot and low Ba contents (72–210 ppm) of the samples compared to the mid‐continental crust (259–628 ppm). Trace element modelling proposes a derivation of the Figuil–Léré dykes from parental melts generated by 4%–15% partial melting of a source containing garnet peridotite in the mixed lithospheric–asthenospheric mantle. The isotopic data of the dykes studied with hybrid magma composition are characterized by more radiogenic 87 Sr/ 86 Sr, 143 Nd/ 144 Nd and 206 Pb/ 204 Pb isotopic ratios with a dominant mixing of depleted MORB mantle (DMM)–enriched mantle 1 (EM1)–enriched mantle 2 (EM2), like those of other mafic dykes of the CL." @default.
• W4387651851 created "2023-10-16" @default.
• W4387651851 creator A5035443826 @default.
• W4387651851 creator A5060538322 @default.
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• W4387651851 creator A5085513780 @default.
• W4387651851 creator A5087866115 @default.
• W4387651851 creator A5092906920 @default.
• W4387651851 date "2023-10-15" @default.
• W4387651851 modified "2023-10-16" @default.
• W4387651851 title "Major, trace elements and <scp>Sr–Nd–Pb</scp> isotopes systematics of mafic dykes from the Figuil (northern Cameroon) and Léré (southwestern Chad) areas" @default.
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