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Abstract
Studies of the chemical and mineralogical properties of pelitic country rocks of South Kyushu into which the Ôsumi, Shibisan, and Takakumayama granitic intrusives were emplaced during the Miocene suggest that exchange of chemical components between the granitic systems and country rocks accompanied the metamorphic and intrusive processes. Pelitic rocks of unusually uniform initial compositions, collected from the same stratigraphic horizons at localities adjacent to and distant from the granitic intrusives, are distinctly different in chemical composition. Some elements, notably Na and K, are distributed in a different manner within the several aureoles; the differences in Na-K distributions appear to reflect different petrochemical properties of the intrusives. Country rocks of granitic intrusives of similar petrochemical properties show similar distributions of elements. Therefore, the processes responsible for the distribution of elements in the country rocks are related to the plutonic processes that caused the entry of the granitic intrusives.
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