Abstract
The circa 2.06 Ga Mt Weld carbonatite complex of Western Australia intrudes an Archean greenstone sequence dominated by basic and ultrabasic metamorphosed igneous rocks. Carbonatites form the core of the complex and are surrounded by glimmerites. The dominant carbonatite is sovite and is intruded by rauhaugites and carbonate-rich veins. The present investigation examines the mineral chemistry and petrology of the layered rauhaugites. They are essentially composed of ferroan dolomite, mica, magnetite and apatite, with accessory amounts of pyrochlore, ilmenite, sphalerite, baddeleyite, pyrite, galena and minerals enriched in the REE. The micas consist of titan-phlogopite, low-Ti phlogopite and “tetraferriphlogopite”. It is proposed that the parental magma of the Mt Weld complex was a potassic, aillikitic lamprophyre.
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