초록

오대산편마암복합체는 미그마타이트질편마암과 반상변정질편마암이 주를 이루며, 소규모의 규암, 앰피볼라이트, 대리암 및 우백질편마암 등이 렌즈상으로 협재되어있다. 이 지역은 최소 2회의 공역변성작용을 받았다. 1차 변성작용시 변성정도는 흑운모-백운모-사장석-석영, 석류석-흑운모-백운모-K-장석-사장석-석영의 광물조합 등을 보이는 동부 및 서남부지역의 K-장석-백운모분대로부터 석류석-흑운모-K-장석-사장석-석영, 흑운모-K-장석-사장석-석영, 석류석-흑운모-K-장석-사장석-규선석-스피넬-석영의 광물조합을 보이는 북서부지역의 K-장석-석류석분대로 증가한다. 사장석 내부에 남정석이 잔류물로 나타난다. 2차 변성작용은 근청석의 생성이 특징적이다. 2차 변성작용시의 변성정도는 근청석-석류석-규선석-흑운모-백운모-석영, 근청석-석류석-스피넬-규선석-흑운모-백운모-석영의 광물조합을 보여주는 개인산을 중심으로하는 석류석-근청석 분대로부터 방사상으로 감소한다. 그 결과 근청석-규선석-흑운모-사장석-석영, 근청석-흑운모-백운모-사장석-석영, 규선석-흑운모-백운모-사장석의 광물 조합을 가지는 규선석-근청석분대가 석류석-근청석분대를 둘러싸며 나타난다. 석류석-흑운모-규선석-K-장석-사장석-스피넬의 광물조합으로부터 계산된 1차 변성작용시의 최대 변성압력-온도조건은 5.4~7.4kb, $776~789^{\circ}C$이나 상평형관계를 고려할 때 실제 변성압력-온도조건은 계산된 조건보다 높았을 가능성이 있다. 사장석내에 잔존하는 석류석-흑운모-사장석에 대한 변성압력-온도조건은 12.5kb, $650^{\circ}C$로 1차 변성작용이 매우 높은 압력경로를 거친후 최대변성 온도조건에 도달했음을 지시한다. 2차 변성작용에서 석류석-흑운모-근청석-스피넬-석영의 광물조합에서 계산된 2차 변성작용시의 압력-온도조건은 6 kb 이하, $680~750^{\circ}C$이다. 오대산편마암복합체에서는 고압의 변성작용과 급격한 지각의 상승을 거친후 중압고온의 1차 변성작용이 일어났으며 구룡층군의 퇴적이후 저압고온의 2차 변성작용이 일어났다.

Abstract

The Odesan Gneiss Complex consists of mainly migmatitic gneiss and porphyroblastic gneiss with locally intercated quartzite, amphibolite, marble and leucocratic gneiss. At least two different regional metamorphisms are recognized in the study area. Metamorphic grade of the first metamorphism increases from the K-feldspar-muscovite zone(in which biotite-muscovite-plagioclase-quartz and garnet-biotite-muscovite-K-feldspar-plagioclase-quartz assemblages occur) in the east and southwestern part of the study area to the K-feldspar-garnet zone(in which garnet-biotite-K-feldspar-plagioclase-quartz, biotite-K-feldspar-plagioclase-quartz, garnet-biotite-K-feldspar-plagioclase-sillimanite-spinel-quartz assemblages occur) in the northwestern part. Kyanite is found as inclusions in plagioclase. The second metamorphism is characterised by occurrence of cordierite. The metamorphic grade of 2nd metamorphism decreases radically from the central-western part near Gaeinsan in which cordierite-garnet-sillimanite-biotite-muscovite-quartz, cordierite-garnet-spinel-sillimanite-biotite-muscovite-quartz assemblages representing the garnet-cordierite zone are observed. The garnet-cordierite zone is surrounded by the sillimanite-cordierite zone which shows cordierite-sillimanite-biotite-plagioclase, cordierite-muscovite-biotite-plagioclase and sillimanite-muscovite-biotite-plagioclase assemblages. The peak metamorphic P-T conditions of the first metamorphism calcuted from garnet-biotite-sillimanite-K-feldspar-plagioclase-spinel assemblage are 5.4~7.4 kb and $776-789^{\circ}C$. Real P-T condition of the first metamorphism might be higher than the calcuated P-T condition according to the study based on the phase equilibria. P-T conditions calcuated from the garnet-biotite in plagioclase are 12.5kb and $650^{\circ}C$ which indicate that the P-T path of the first metamorphism had passed a high pressure condition before the peak metamorphic temperature condition. The peak metamorphic P-T conditions of the second metamorphism calcuated from garnet-biotite-cordierite-spinel-quartz assemblage are $680~750^{\circ}C$ at pressures lower than 6 kb. In the Odesan Gneiss Complex, the first metamorphism of medium pressure and high temperature had occurred after the high pressure condition and fast uplift and then the second metamorphism of low pressure condition occurred after sedimentation of the Kuryong Group.

주제어

#오대산편마암복합체   #K-장석-배운모분대   #K-장석-석류석대   #석류석-근청석대   #규선석-근청석대  

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참고문헌 (38)

1. 김옥준;김서운;유병화;박병권;김규호 , 북분리 지리도폭설명서 / v.,pp.17, 1975
   
2. Thermobarometry using multiequilibrium calculations ; a new technique, with petrological applications , Berman, R.G. , Can. Min. / v.29,pp.833-855, 1991
   
3. Optimized standard state and mixing properties of minerals : Ⅰ. Model calibration for olivine, orthopyroxene, cordierite, garnet and limenite in the system $FeO-MgO-CaO-Al_2O_3-TiO_2-SiO_2$ , Berman, R.G.;Aranovich, L.Ya. , Contrib. Mineral. Petrol. / v.,pp., 1996
   
4. Fe-Mg mixing in cordierite : Constraints from natural data and implications for cordieritegarnet geothermometry in granulites , Bhattacharya, A.;Mazumdar, A. C.;Sen, S. K. , Am. Min. / v.73,pp.338-344, 1988
   
5. Geothermometry, geobarometry and $Al_2SiO_5$ triple point at Mt. Moosilauke, New Hampshire , Hodges, K. V.;Spear, F. S. , Am. Min. / v.67,pp.1118-1134, 1982
   
6. Biotite-garnet geothermometry in the granulite facies : the influence of Ti and Al in biotite , Indares, A.;Martignole, J. , Am. Min. / v.70,pp.272-278, 1985
   
7. Metapelitic granulites from Jetty Peninsula, east Antarctica : formation during a single event or by polymetamorphism? , Hand, M.;Scrimgeour, I.;Powell, R.;Stuwe, K.;Wilson, J.L. , J. Metamorphic Geol. / v.12,pp.557-573, 1994
   
8. Phase correspondence in the system biotite-garnet : experimental data , Lavrent'eva, I.V.;Perchuk, L.L. , Doklady Akademii Nauk(USSR) / v.260,pp.731-734, 1981
   
9. Internally consistent gahnitic spinel-cordierite-garnet equilibria in the FMASHZn system : geothermobarometry and applications , Nichols, G.T.;Berry, R.E.;Green, D.H. , Contrib. Mineral. Petrol. / v.111,pp.362-377, 1992
   
10. 춘천-홍천지역 용두리 편마암 복합체내에 산출하는 남정석 ; 변성 지구조적 의의 , 조문섭;김종욱 , 암석학회지 / v.2,pp.1-8, 1993
    원문보기 상세보기
11. A studyh on metamorphism of the metamorphic rocks in the central part of Gyeonggi massif , Kim, J.Y. , Seoul Nat'l Univ. Unpubl. Ph. D. thesis / v.,pp.278, 1989
    
12. Biotite and garnet compositional variation and mineral equilibria in Grenville gneisses of the Otter Lake area, Quebec , Kretz, R. , J. Metamorphic Geol. / v.8,pp.493-506, 1990
    
13. 경기 육괴 변성암의 흑운모 Rb-Sr 연대 : 지구조적 의미 , 권성택;전은영;이진한 , 지질학회지 / v.33,pp.49-53, 1997
    
14. Perchuk, L.L.;Podlesskii, K.K.;Aronvich, L.Ya. , Calculations of thermodynamic properties of end-member minerals from natural paragenesis, in Newton / v.,pp., 1981
    
15. Tectonometamorphic evolution of the Chuncheon amphibolite, central Gyeonggi massif, South Korea , Lee, S.R.;Cho, M. , J. Metamorphic Geol. / v.13,pp.315-328, 1995
    
16. Program manual and computer exercises for the calculation of metamorphic phase equilibria, pressure-temperature-time paths and thermal evolution of orogenic belts , Spear, F. S.;Peacock, S.M. , Am. Geophysical Union / v.188,pp., 1990
    
17. Regional metamorphism in the Gyeonggi massif with comparative studies on the Yeoncheon and Ogcheon metamorphic belts (2) , Na, K.C. , J. Geol. Soc. Korea / v.15,pp.67-88, 1979
    
18. A preliminary CHIME age determination of monazites from metamorphic and granitic rocks in the Gyeonggi Massif, Korea , Cho, D.L.;Suzuki, K.;Adachi, M.;Chwae, U. , J. Earth Sci., Nagoya Univ. / v.43,pp.49-65, 1996
    
19. 선캠브리아 경기육괴 중 대리암의 연대측정에 대한 예비연구 , 박계헌;정창식 , 암석학회지 / v.2,pp.130-138, 1993
    원문보기 상세보기
20. Ternaryfeldspar modeling and thermometry , Fuhrman, M.L.;Lindsley, D.H. , Am. Min. / v.73,pp.201-216, 1988
    
21. Regional metamorphism in the Gyeonggi massif with comparative studies on the Yeoncheon and Ogcheon metamorphic belts (3) , Na, K.C. , J. Geol. Soc. Korea / v.15,pp.127-133, 1979
    
22. Empirical calibration of six geobarometers for the mineral assemblage quartz+muscovite+biotite+plagioclase+garnet , Hoisch, T. D. , Contrib. Mineral. Petrol. / v.104,pp.225-234, 1990
    
23. 연천-전곡지역에 분포하는 임진강대의 고압 각섬암 , 조문섭;권성택;이진한;Eizo Nakamura , 암석학회지 / v.4,pp.1-19, 1995
    원문보기 상세보기
24. The P-T condition and timing of the main metamorphism in the southwestern part of the Okchon metamorphic belt , Oh, C.W.;Kim, S.T.;Lee, J.H. , J. Geol. Soc. Korea / v.31,pp.343-361, 1995
    
25. Metamorphic phase equilibria and pressure-temperature-time paths , Spear, F. S. , MSA monograph / v.1,pp.799, 1993
    
26. A refined garnet-biotite Fe-Mg exchange geothermometer and its application in amphibolites and granulites , Dasgupta, S.;Sengupta, P.;Guha, D.;Fukuoka, M. , . Mineral. Petrol. / v.109,pp.130-137, 1991
    
27. Non-ideal mixing in the phlogopiteannite binary : constraints from experimental data on Mg-Fe partitioning and a reformulation of the biotite-garnet geothermometer , Bhattacharya, A.;Mohanty, L.;Maji, A.;Sen, S.K.;Raith, M. , Contrib. Mineral. Petrol. / v.111,pp.87-93, 1992
    
28. 가평-청평지역 경기육괴의 변성작용 , 이광진;조문섭 , 암석학회지 / v.1,pp.1-24, 1992
    원문보기 상세보기
29. 정창희;원종관;차문성;강기우;이윤종 , 오대산 지질도폭설명서 / v.,pp.18, 0000
    
30. Experimental investigation of exchange equilibria in the system corderite-garnet-biotite , Perchuk, L.L.;Lavrent'eva, I.V.;S.K. Saxena(ed.) , Kinetics and equilibrium in mineral reactions / v.,pp.199-239, 1983
    
31. 이대성;윤석규;김정진 , 창촌 지질도폭설명서 / v.,pp.19, 1975
    
32. 김봉균;지정만;이돈영;소칠섭 , 현리 지질도폭설명서 / v.,pp.19, 1975
    
33. Regional metamorphism in the Gyeonggi massif with comparative studies on the Yeoncheon and Ogcheon metamorphic belts (1) , Na, K.C. , J. Geol. Soc. Korea / v.14,pp.195-211, 1978
    
34. 강필종;진명식 , 풍암 지질도폭설명서 / v.,pp., 1972
    
35. 청평-앙평지역에 분포하는 근청석 편마암의 백립암상 변성작용과 P-T 진화경로 , 조윤호;조문섭;이승렬 , 암석학회지 / v.5,pp.52-65, 1996
    원문보기 상세보기
36. Experimental Calibration of the Partitioning of Fe and Mg Between Biotite and Garnet , Ferry, J. M.;Spear, F. S. , Contrib. Mineral. Petrol. / v.66,pp.113-117, 1978
    
37. A study on the metamorphism in the southwestern part of Gyeonggi Massif , Na, K.C. , J. Petrol. Soc. Korea / v.1,pp.25-33, 1992
    원문보기 상세보기
38. Quantitative P-T paths from zoned minerals : Theory and tectonic applications , Spear, F. S.;Selverstone, J. , Contrib. Mineral. Petrol. / v.83,pp.348-357, 1983
    

이 논문을 인용한 문헌 (8)

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