Supplementary document for the paper: Petrogenesis of the peralkaline Dutsen Wai and Ropp complexes in the Nigerian Younger Granites: Implications for crucial metal enrichments. Amuda et al., 2020. Local geology and sampling Dutsen Wai plutonsThe complex consists of alkaline epizonal plutons, discordantly intruded into migmatite and granite gneiss basement. It comprises of two main phases; volcanic and plutonic rock units peculiar to the NYG province. Most of the intrusive plutons (over 90%) are made up of biotite granites, granite porphyry and albite riebeckite-arfvedsonite-aegerine granites.Structurally, the entire massifs trend nearly north-south (Supp Figure 1a). Remnants of volcanic breccias that strike almost east-west (050º ESE) border the extreme south of the complex (Supp Figure 1b).The most prominent structure is the series of NW-SE to nearly NS trending joint systems (Fig. 2a).Two peralkaline plutons (about 10 -15% by volume) are poorly exposed and covers an area of approximately 1.9km 2 , flanks the northeast and eastern margin of the main biotite granite (about 75% by volume) of the complex (Fig. 2a). A low-lying sheet like pink coloured medium to coarse-grained granite intrusion ('reddened' granite) straddled between the two peralkaline plutons (Supp Figure 1c). The roof zones of the granite outcrops appear compositionally homogenous. 15 samples (Dt's, DyL and Db's) were collected in a network at about 45 by 45m 2 systematic random grid pattern.

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