Chemistry and Petrography of the Sillai Patti Carbonatite Complex, Northern Pakistan
Abstract
Detailed geology, petrography and chemistry of Sillai Patti sheeted carbonatite complex is presented. The complex is an anastamosing set of dykes intruding metamorphics of possible Proterozoic age. The complex is interpreted to be a product of multiple intrusions. The early phase of the intrusion is represented by peralkaline ultrabasic rocks (pyroxenites). This was followed by the intrusion of carbonatites and its attendant fenitization. There is a considerable petrographic and chemical variability in the complex which is considered to be a function of varying degree of fenitization and hybridization of the earlier ultrabasic rocks by the carbonatite dykes.
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