Petrogenesis and 40Ar/39Ar Geochronology of the Brandberg Complex, Namibia: Evidence for a Major Mantle Contribution in Metaluminous and Peralkaline Granites
作者： A. K. SCHMITT , R. EMMERMANN , R. B. TRUMBULL , B. BÜHN , F. HENJES-KUNST
DOI: 10.1093/PETROLOGY/41.8.1207
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摘要: Anorogenic granites of the Brandberg igneous complex in NW peralkaline formed from highly evolved melts (Eu/Eu <0·1) and melt inclusion analysis arfvedsonite pegmatite Namibia during early Cretaceous rifting continental break-up Gondwana. A metaluminous series [SiO2 = 62–77 indicate that enhanced solubilities an F-rich residual wt %, molar (Na + K)/Al 0·8–0·95] includes could account for observed enrichments high-field strength monzonite body, major biotite–hornblende granite, late biotite granite elements. Compositional variations within group segregations peripheral dykes trachydacite. Volumetrically reflect at least part late-magmatic mineral segregation minor Amis 72–77 hydrothermal overgrowth. 1·0–1·5] intrude main adjacent country rocks. Compared with these are enriched Zr, Nb, Y, U Th.
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