Abstract
Granitic rocks in Japan have an intimate correlation with the country rocks which they intrude. The granitic rocks which intrude basic rocks are mainly quartz diorite and tonalite, whereas those which intrude acidic rocks are mainly biotite granite or hornblende-biotite granodiorite. This relation suggests that the granitic magmas changed their compositions by assimilation of country rocks. $$K_{2}O/Na_{2}O$$ ratios of granitic rocks support the assimilation hypothesis as origin of major granitic rocks in Japan.
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