Abstract
The Al-Halgah Pluton is a post-tectonic, Late Precambrian intrusive emplaced into a succession of amphibolites, quartzofeldspathic gneisses, and metasedimentary rocks. The pluton is predominantly granitic (quartz-alkali feldspar-plagioclase-biotite-amphibole-muscovite). Systematic modal and textural variations permit division of the pluton into four units: ovoidal granite in the southern part, quartz monzonite in the core, granite and leucocratic granite at the margin. Quartz and alkali feldspar increase from the core outwards, with a concomitant decrease in plagioclase, biotite, amphibole and the ratios of plagioclase/total feldspar and amphibole/biotite. Muscovite appears in the leucocratic granite and amphibole is absent from the north-eastern part of the pluton. Si, K, and Rb increase systematically from the core to the margin while Al, Fe, Mg, Ti, Ca, Mn, P, Sr, Ba and Zr decrease.
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