Granitization - fact or fiction?

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Abstract
Augen gneisses, formed by granitization of meta-andesites near Loftahammar, are described. Grantization was mainly isochemical within the parental rock suite, metarhyolites and meta-andesites. The process seems to have been triggered by influx of a vapour phase (water). The augen gneisses formed are similar to the ‘melanocratic Loftahammar granites’ found in the surroundings. The granitization process is compared with other rock-forming metasomatic processes, such as fenitization. It is concluded that the lack of unusual mineral assemblages formed during granitization makes recognition of the process difficult. However, that we do not recognize a process does not mean that it does not occur. In analogy with fenitization, it is suggested that granitization may well be an important rock-forming process.

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