Study of Geochemical Changes in the Metasediments, Occurring Around the Richughuta Granite, District Palamau, Bihar

The present studies deal with the nature of the chemical changes induced in a suite of Archaean metasediments of varying lithologies during the emplacement of a granitic pluton. On the basis of a large number of analyses of the affected and unaffected rocks it has been shown that the nature and magnitude of the chemical changes have been primarily governed by the original composition of the respective zones, while the other factors have played only a secondary role. It has been suggested that the idea of 'basic front' is out of place in the context of granitization and that it refers to an altogether different process. Similarly it has been shown that the process of granitization, truly speaking, is very restricted in its application and that it is not correct to ascribe such processes as metamorphic differentiation, feldspathization and alkali metasomatism to it.