Table 4.

Potassic Metasomatic and Diagenetic Alteration: Major Varieties

Name	Association	T (°C)	Alkali Feldspar	Mafic Minerals	References
Fenitization	Alkaline Igneous	~450 to ~700	Microcline, Orthoclase	Pyroxene, mica, amphibole	Le Bas [2008] and Pirajno [2013]
Potassic alteration	Porphyry Copper	~800 to ~450	Microcline, Orthoclase	Biotite, epidote, actinolite	Pirajno [2013] and Sillitoe [2010]
K‐metasomatism	Extensional Faulting	<150	Sanidine	Illite, biotite	Beratan [1999] and Glazner [1988]
Diagenesis	Low Temperature	<100	Sanidine	Smectite, glauconite	Fedo et al. [1995], Hay et al. [1988] and Walker et al. [1978]