Browsing by Author "Nakashole, Albertina"

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    Geochemistry and petrogenesis of the Tsirub nephelinite-basanite intrusions, Aus, southern Namibia
    (2007) Nakashole, Albertina; Reid, Dave
    Nephelinite-basanite intrusions found on the Tsurib farm near Aus in southern Namibia are described for the first time. The petrography is very similar to each other wih texture ranging from porphyritic to microporphyritic where olivine is dominant, and sometimes the only, phenocryst/microphenochryst phase, and less commonly clinopyroxen; the groundmass consists of clinopyroxine, olivine, Fe-Ti oxides and secondary generation amphibole. Rare felsic xenoliths comprising alkali feldspar (orthoclase) and clinopyroxene (diopside and aegerine-augite) occur in the two major intrusive bodies.