Granites represent the last step in the evolution of a rock from mafic to felsic.
OriginGranite from the Massif of Tauorirt Tan Afella in the Hoggar Mountains Algeria, Africa
- LILE (Rb, Sr, K, Ba): 10-40000 µg/g.
- HFSE (Zr, Hf, Th, U, Nb, Ta) 7.00-150 µg/g.
- Transition metals (Sc, V, Cr, Co, Ni, Cu, Zn, Mo) 1.00-220 µg/g.
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Felsic rocks are characterised by a high silica content of > 69 m/m% and high concentrations of alkali metals such as sodium and potassium. Their principal mineralogy is comprised of quartz, sodium- and or potassium-rich feldspar varieties, but may also contain micas i.e. muscovite. On average the continental crust can be described as being felsic. Mafic minerals are virtually absent.