The basement suite of the Humr Waggat area is consists of Pan-African serpentinites, calc-alkaline metavolcanics, metagabbros and post orogenic granites.
geochemically, the serpentinites are of hurzburgite parentage and enrcihed in Ni which bears non-consanguineous relationships with the tectonically incorporated metavolcanics and metagabbros which of calc-alkaline geochemistry, formed in an island arc setting. Their chemical data shows their common genetic origin.
The Humr Waggat granite (HWG) is post orogenic, emplaced into the folded Pan-African belt. Post tectonic magmatic activity resulted in the emplacement of two alkaline granite phases a mmonzogranite and a syenogranite. The geochemical data indicate that the HWG was emplaced within plate (WP) tectonic setting, possessing alkaline characteristics of the A2 subtype granites. The K2O and K2O/Na2O contents of HWG suggest that it was generated by melting of crustal igneous rocks of tonalitic and granodioritic composition. Moreover, the feldspars chemistry indicates that the plagioclase fledspars are of albite composition and the alkali feldspars are of low temperature type.