Abstract
The so-called sheared granites of Hitachi district are divided, from their modes of occurrence as well as from their petrographical characters, into C-type and A-type., The rocks of the former type are somewhat sheared, massive rocks consisting of chlorite, epidote, quartz and plagioclase., They are distributed in the eastern part of the sheared granite mass., The rocks of the latter type are gneissic rocks composed of amphibole, biotite, quartz and plagioclase., They occupy the western part of the sheared granite mass., The sheared granites of C-type are considered to be protoclastic rocks injected under somewhat dynamic conditions, those of A-type having been derived from the rocks of C-type by the dynamothernal metamorphism connected with the invasion of granodiorite mass which is distributed in the northern part of the district.,
