The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
권호 표지

Granulites of northern korea

한반도 북부의 백립암

  • Glebovitsky, V.A. (Institute of Precambrian Geology and Geochronology of Russia Academy of Science) ;
  • Sedova, I.S. (Institute of Precambrian Geology and Geochronology of Russia Academy of Science) ;
  • Bushmin, S.A. (Institute of Precambrian Geology and Geochronology of Russia Academy of Science) ;
  • Vapnik, Ye.A. (Institute of Precambrian Geology and Geochronology of Russia Academy of Science) ;
  • Buiko, A.K. (Institute of Precambrian Geology and Geochronology of Russia Academy of Science)
  • Published : 1994.12.01
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Abstract

Granulite complexes in northern (the Nangnim block), eastern (ther Kimchaek zone of the Macheonryong belt) and southern (separate windows among upper Proterozoic structure such as the Wonsan, Nampo and Haeju granulites) parts of the Northern Korea are studied. Multistage deformations, metamorphic and migmatitic events, and granite formations are recognized in these granulite complexes. Mineral thermobarometry and fluid inclusion investigationss are used to establish the P-T evolutionary trends during prograde and retrograde metamorphic events. The peak metamorphism of granulites is characterized by temperature near $800^{\circ}C$ and pressure near 5.5-6 kb. Retrograde evolution includes cooling at constant pressure or with variable pressure ranging up to 7-8 kb. This P-T change corresponds to the transition from high to moderate or low geothermal gradient. The subsequent cooling is ac-companied by significant decompression to 3-4 kb.

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