The Entire anorthositic gneiss, eastern Arunta Inlier, Central Australia: Geochemistry and petrogenesis

A cumulus igneous origin is proposed for anorthositic gneisses, anorthositic metagabbros and meta‐ultramafic rocks comprising the Entire anorthositic gneiss member of the Early Proterozoic Harts Range meta‐igneous complex (HRMC), eastern Arunta Inlier. The ultramafic and anorthositic gneisses possess distinctive whole‐rock chemistries which are the result of cumulus components with widely different proportions of variably evolved intercumulus liquid. A comagmatic relationship between these rocks and their host HRMC amphibolites is supported by a strong similarity between the observed trace element chemistry of the amphibolites and the trace element compositions of calculated equilibrium liquids from which the cumulates crystallized. In addition, some garnet‐bearing anorthositic metagabbros have absolute trace element abundances similar to the amphibolites. The parental magma for the ultramafic‐anorthositic rocks was a depleted aluminous tholeiitic melt selectively re‐enriched in large ion lithophile (LIL)...

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