암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
권호 표지
DOI QR코드

DOI QR Code

영남육괴 지리산지구에서 하동 남부 회장암복합체와 그 주변지역의 변형단계별 구조적 특성

Deformational Phased Structural Characteristics of the Hadong Southern Anorthosite Complex and its Surrounding Area in the Jirisan Province, Yeongnam Massif, Korea

  • 이덕선 (안동대학교 지구환경과학과) ;
  • 강지훈 (안동대학교 지구환경과학과)
  • Lee, Deok-Seon (Department of Earth and Environmental Sciences, Andong National University) ;
  • Kang, Ji-Hoon (Department of Earth and Environmental Sciences, Andong National University)
  • 투고 : 2013.06.07
  • 심사 : 2013.06.26
  • 발행 : 2013.06.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

영남육괴 지리산지구의 남동부에 위치하는 연구지역은 선캠브리아기 지리산 변성암복합체(이하, 변성암체)와 덕천강 이남의 하동 남부 회장암복합체(이하, 회장암체) 그리고 이들을 부정합으로 피복하는 백악기 퇴적암류 등으로 구성되어 있으며, 선캠브리아기 구성암류의 암상분포는 주로 남북 방향성을 보이고, 부분적으로 북동 방향성을 보인다. 본 논문은 하동 남부 회장암체와 주변부의 지리산 변성암체에 발달하는 변형된 암석구조에 대한 운동학적 기하학적 특성과 중첩된 변형구조들의 선후관계로부터 변형단계별 구조적 특성을 연구하였다. 연구지역의 지체구조는 적어도 세 번의 연성 변형단계를 거쳐 형성되었다. 첫 번째($D_1$) 변형은 상부가 남동쪽으로 이동하는 대규모 연성전단작용에 의해 지리산 변성암체와 하동 남부 회장암체에 북동 방향의 광역적인 지체구조와 칼집 내지 "A"형 습곡을 형성시켰다. 두 번째($D_2$) 변형은 동서 방향의 압축 지구조환경 하에서 $D_1$ 변형과 같이 광역적으로 발생하여 능동 및 수동적 습곡작용에 의해 그 이전에 형성된 북동 방향의 광역적인 $D_1$ 지체구조의 방향성을 대부분 남북 방향으로 재배열시켰으며, 압쇄암화작용을 통해 하동 남부 회장암체와 지리산 변성암체의 동쪽 경계부를 따라 적어도 2.3~1.4 km 이상의 폭을 갖는 연장성이 우수한 남북 방향의 연성전단대(하동전단대)를 형성시켰다. 세 번째($D_3$) 변형은 남북 방향의 압축 지구조환경 하에서 발생하여 그 이전 형성된 구조요소들의 방향성을 국부적으로 동북동 내지 서북서 방향으로 재배열시켰다. 이는 선캠브리아기 구성암류의 부분적인 북동 방향의 암상분포와 광역적인 남북 방향의 암상분포는 각각 $D_1$과 $D_2$ 변형과 밀접한 관련이 있으며, 덕천강 이북의 하동 북부 회장암체의 동부를 따라 발달하는 남북 방향의 하동전단대는 하동 남부 회장암체에서도 연장성 있게 발달함을 의미한다.

The study area, which is located in the southeastern part of the Jirisan province, Yeongnam massif, Korea, is mainly composed of the Precambrian Hadong southern anorthosite complex (HSAC), the Jirisan metamorphic rock complex (JMRC) and Cretaceous sedimentary rock which unconformably covers them. Lithofacies distribution of the Precambrian constituent rocks mainly shows NS and partly NE trends. This paper researched deformational phased structural characteristics of HSAC and JMRC based on the geometric and kinematic features and the forming sequence of multi-deformed rock structures, and suggests that the geological structures of this area was formed through at least three phases of ductile deformation. The first phase ($D_1$) of deformation happened due to the large-scale top-to-the SE shearing, and formed the sheath or "A"-type fold and the regional tectonic frame of NE trend in the HSAC and JMRC. The second phase ($D_2$) of deformation, like the $D_1$ deformation, regionally occurred under the EW-directed tectonic compression, and most of the NE-trending $D_1$ tectonic frame was reoriented into NS trend by the active and passive folding, and the persistent and extensive ductile shear zone (Hadong shear zone) with no less than 2.3~1.4 km width was formed along the eastern boundary of HSAC and JMRC through the mylonitization process. The third phase ($D_3$) of deformation occurred under the NS-directed tectonic compression, and partially reoriented the pre-$D_3$ structural elements into ENE or WNW direction. It means that the distribution of Precambrian lithofacies showing NE trend locally and NS trend widely in this area is closely associated with the $D_1$ and $D_2$ deformations, respectively, and the NS-trending Hadong shear zone in the eastern part of Hadong northern anorthosite complex, which is located in the north of Deokcheon River, also extends into the HSAC with continuity.

키워드

참고문헌

  1. Choi, J.B. and Kwak, J.Y., 2012, Occurrence of REE-bearing Allanite with Th-mineral (thorite) in Wolhoengri, Hadong, Korea. Journal of the Mineralogical Society of Korea, 25, 295-304. https://doi.org/10.9727/jmsk.2012.25.4.295
  2. Choi, Y.K., Cheong, C.H., Lee, D.S., Kim, S.W. and Kim, S.J., 1964, Geological report of the Danseong sheet (1:50,000), Korea. Institute of Energy and Resources, 28p.
  3. Jeong, J.-G., 1980, Petrogenesis of anorthosite and related rocks in Hadong-Sancheong district, Korea. Ph. D. dissertation, Seoul National University, 153p.
  4. Jeong, J.-G., 1987, Magmatic Differentiation of the Anorthositic Rocks in Hadong-Sancheong Area. Journal of the Geological Society of Korea, 23, 216-228.
  5. Jeong, J.-G., Kim, W.-S. and Watkinson, D.H., 1989, Geologic Structure of Hadong Anorthositic Rocks and Associated Titanium Orebody. Journal of the Geological Society of Korea, 25, 98-111.
  6. Jeong, J.-G. and Lee, S.-M., 1986, Regional metamorphism of anorthositic rocks in Hadong-Sancheong area. Memory for Professor Sang Man Lee's 60th, 87-106.
  7. Jung, J.S., Kim, J.-S., Cho, H.S., Song, C.-W., Son, M., Ryoo, C.-R., Chi, S.J. and Kim, I.-S., 2010, Occurrence and Deformation of Fe-Ti ores from the Proterozoic Hadong Anorthosites, Korea. Journal of the Petrological Society of Korea, 19, 31-49.
  8. Kang, H.-C., Kim, I.-S. and Son, M., 2001, Palaeomagnetic Results from Late Palaeoproterozoic anorthositic rocks in Hadong-Sanchong area, South Korea. Journal of the Geological Society of Korea, 37, 269-286.
  9. Kim, D.-Y., Park, K.-H. and Song, Y.-S., 2000, Development ages of charnockites and anorthositic rocks of Jirisan area and their genetic relationship(Abstract). Proceedings of the Annual Joint Conference, Petrological Society of Korea and Mineralogical Society of Korea, 37.
  10. Kim, D.-Y., Song, Y.-S. and Park, K.-H., 1998, Petrological, Geochemical and Geochronological Studies of Charnockite of Eastern Jirisan Area(Abstract). Proceedings of the Annual Conference, Geological Society of Korea, 35-36.
  11. Kim, D.-Y., Song, Y.-S. and Park, K.-H., 2002, Petrogenesis and Metamorphism of Charnockite of Eastern Jirisan Area. Journal of the Petrological Society of Korea, 11, 138-156.
  12. Kim, H.S., 1970, Regional Metamorphism of the South-Western Part of Korea. Journal of the Geological Society of Korea, 6, 97-118.
  13. Kim, H.S., 1999, The oldest known rock in the world "Tonalite gneiss". Journal of the Petrological Society of Korea, 8, 125-129.
  14. Kim, J.-S., Ahn, S.-H., Cho, H.S., Song, C.-W., Son, M., Ryoo, C.-R. and Kim, I.-S., 2011, Occurrences of Fe-Ti Ore Bodies and Mafic Granulite in the Sancheong Anorthosites, Korea. Journal of the Petrological Society of Korea, 20, 115-135. https://doi.org/10.7854/JPSK.2011.20.2.115
  15. Kim, J.-S., Cho, H.S., Ahn, S.-H., Song, C.-W., Son, M. and Kim, I.-S., 2010, SHRIMP U-Pb age of the Sancheong Anorthositic Rocks and Dyke Swarms, Yeongnam Massif, Korea(Abstract). Joint conference of the Geological Science and Technology of Korea, 125-126.
  16. Kim, K.H. and Chung, J.-I., 1994, Paleomagnetic Study on the Anorthositic and Basic Intrusive Rocks Distributed in the Hadong-Sancheong Area. Journal of the Geological Society of Korea, 30, 81-92.
  17. Kim, O.J., Park, H.I., Kim, K.T., Hong, M.S., Park, Y.D. and Yoon, S., 1964, Geological report of the Sancheong sheet(1:50,000), Korea. Institute of Energy and Resources, 25p.
  18. Kim, S.-W., Choi, E.-K. and Kim, I.-S., 1999, Anisotropy of Magnetic Susceptibility(AMS) of Anorthositic Rocks in the Hadong-Sanchong Area. Journal of the Korean Geophysical Society, 2, 169-178.
  19. Kim, Y.-J., Lee, C.-S. and Kang, S.-W., 1991, Petrochemistry on Intermediated-Basic Plutons in Jirisan Area of the Ryongnam Massif. Journal of the Korean Earth Science Society, 12, 100-122.
  20. Ko, B.K., 2006, Petrological and geochemical studies of the petrogenesis of the Hadong-Sancheong anorthosite complex. Ph. D. dissertation, Kangwon National University, 154p.
  21. Kwon, S.-T. and Jeong, J.-G., 1990, Preliminary Sr-Nd isotope study of the Hadong-Sancheong anorthositic rocks in Korea: implication for their origin and for the Precambrian tectonics. Journal of the Geological Society of Korea, 26, 341-349.
  22. Lee, C.-H., Lee, S.-W., Ock, S.-S. and Song, Y.-S., 2001, Petrology of the Blastoporphyritic Granite Gneiss in the Southwestern Part of the Sobaegsan Massif. Journal of the Korean Earth Science Society, 22, 528-547.
  23. Lee, D.-S., 1987, Geology of Korea. Geological Society of Korea, Kyohaksa, Seoul, 514p.
  24. Lee, D.-S. and Kang, J.-H., 2012, Geological Structures of the Hadong Northern Anorthosite Complex and its surrounding Area in the Jirisan Province, Yeongnam Massif, Korea. Journal of the Petrological Society of Korea, 21, 287-307. https://doi.org/10.7854/JPSK.2012.21.3.287
  25. Lee, D.-S. and Kang, J.-H., 2013, Deformational Phased Structural Characteristics of Jirisan Metamorphic Complex in the Hwagae Area, to the Western Part of the Hadong Anorthosite Complex, Korea(Abstract). Proceedings of the Annual Joint Conference, Petrological Society of Korea and Mineralogical Society of Korea, 106-107.
  26. Lee, J.M., Jeong, J.G. and Kim, W.S., 1999, The Preliminary Study on the Evolution of Hadong Anorthositic Rocks and Their Genetic Relations with Ilmenite-Bearing Ore Bodies, Korea. Journal of the Geological Society of Korea, 35, 321-336.
  27. Lee, S.M., 1980, Some Metamorphic Aspects of the Metapelites in Jirisan(Hadong-Sancheong) Region. Journal of the Geological Society of Korea, 16, 1-15.
  28. Lee, S.M., 1988, Metamorphic facies studies in the Sobaegsan massif. Korea Institute of Energy and Resources, KR-87-5.
  29. Lee, S.M. and Kim, H.S., 1984, Metamorphic Studies on the so-called Yulri and Weonnam Groups in the Mt. Taebaeg Area. Journal of the Geological Society of Korea, 20, 195-214.
  30. Lee, S.M., Na, K.C., Lee, S.H., Park, B.Y. and Lee, S.W., 1981, Regional Metamorphism of the Metamorphic Rock Complex in the Southeastern Region of the Sobaeksan Massif. Journal of the Geological Society of Korea, 17, 169-188.
  31. Park, K.-H., Kim, D.-Y. and Song, Y.-S., 2001, Sm-Nd mineral ages of charnockites and ilmenite-bearing anorthositic rocks of Jirisan area and their genetic relationship. Journal of the Petrological Society of Korea, 10, 27-35.
  32. Park, K.-H., Song, Y.-S., Park, M.-E., Lee, S.-G. and Ryu, H.-J., 2000, Petrological, Geochemical and Geochronological Studies of Precambrian Basement in Northeast Asia Region: 1. Age of the Metamorphism of Jirisan Area. Journal of the Petrological Society of Korea, 9, 29-38.
  33. Reedman, A.J. and Um, S.-H., 1975, Geology of Korea. Korea Institute of Energy and Resources, Seoul, 139p.
  34. Song, Y.-S., 1981, Study on metamorphism of the metamorphic rocks in hadong-sancheong area. Ph. D. dissertation, Seoul National University, 44p.
  35. Song, Y.-S., 1999, Granulite xenoliths in porphyroblastic gneiss from Mt. Jiri area, SW Sobaegsan massif, Korea. Journal of the Petrological Society of Korea, 8, 34-45.
  36. Song, Y.S. and Lee, S.M., 1989, Petrology of the Precambrian Metamorphic Rocks from the Central Sobaegsan Massif, Korea. Journal of the Geological Society of Korea, 24, 451-468.
  37. Turek, A. and Kim, C.-B., 1995, U-Pb zircon ages of Mesozoic plutons in the Damyang-Geochang area Ryongnam massif, Korea. Geochemical Journal, 29, 243-258. https://doi.org/10.2343/geochemj.29.243
  38. Turek, A. and Kim, C.-B., 1996, U-Pb zircon ages for Precambrian rocks in southwesten Ryeongnam and southwesten Gyeonggi massif, Korea. Geochemical Journal, 30, 231-249. https://doi.org/10.2343/geochemj.30.231

피인용 문헌

  1. Geometric and Kinematic Characteristics of Fracture System in the Sancheong Anorthosite Complex, Korea vol.25, pp.4, 2016, https://doi.org/10.7854/JPSK.2016.25.4.389