Abstract
The granitic rocks in the Inje-Hongcheon district grade from hornblende-biotite granodiorite, porphyritic biotite granite, equigranular biotite granite and two-mica granite from the center to the margin. These granitic rocks have gradual boundaries with each other and show a gradual change in mineral compositions. In major element geochemistry, the granitic rocks show a general trend of crystallization differentiation from a granodioritic magma to a granitic magma in the strict sense. From the petrographical and major element geochemical studies, it can be said that the lithological varieties of the granitic rocks are due to the internal differentiation in a single magma chamber. The hornblende-biotite granodiorite and the porphyritic biotite granite show the characteristics of I-type and magnetite-series granitoids, while the equigranular biotite granite and two-mica granite exhibit those of S-type and ilmenite-series granitoids. The different I-/S-type and magnetite-/ilmenite-series characteristics between the central and marginal parts stem from the different degrees of the reaction of original magma with surroundings and from the consequent differences of redox conditions during solidification of the magma.
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