The Klokken Gabbro-Syenite Complex, South Greenland: Quantitative Interpretation of Mineral Chemistry

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Abstract
The layered syenite series in the Klokken stock formed by continuous in situ fractionation of a trachytic magma in a chamber lined by gabbro with ≲ 3000 m of cover rocks. The following minerals and reactions are assessed as geothermometers and barometers: two feldspars; hypersolvus ternary feldspars; ferrohedenbergite-β-wollastonite; clinopyroxene-olivine Fe-Mg exchange; Fe-Ti oxides; sanidine-magnetite-annite; ferroedenite stability. Estimates of silica activity are obtained from the silica-magnetite-fayalite assemblage.