RISS 검색 - 국내학술지논문

The study area mainly consists of metasedimentary rocks and is intruded or covered by Jurassic granite and Cretaceous volcanic and subvolcanic rocks. Three different metamorphic events are recognized in the study area. The metamorphism which made the most prevailing mineral assemblages in the study area is intermediate-P/T type M2 regional metamorphism. The metamorphic grade of the M2 metamorphism increases from the chlorite zone through the biotite and garnet zones to the kyanite zone towards northwest. The M1 metamorphism which occurred before the M2 metamorphic event is recognized by the coarse-grained biotite porphyroblasts in chlorite zone metasedimentary rocks of the M2 metamorphism. The M3 low-P/T type contact metamorphism due to the intrusion of the Jurassic granite after the M2 metamorphic event is identified by the appearance of sillimanite and andalusite in metapelites around Jurassic granite. The result of this study is well matched with the study of Oh et al. (1995) done in the Nonsan-Gosan area which neighboured the study area to the southwest. The P-T conditions of the garnet and kyanite zones are 4.6 - 6.9 kbar, 565 - 620℃ and 5.9 - 6.2 kbar, 660 - 690℃, respectively. The P/T gradient of P-T path calculated from the kyanite zone indicates a fast increase of pressure during prograde metamorphism. The P-T conditions of the sillimanite zone caused by M3 contact metamorphism are 3.6 - 4.8 kbar, 595 - 640℃.

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