The Journal of the Petrological Society of Korea (암석학회지)

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

DOI QR Code

Geology and U-Pb Age in the Eastern Part of Yeongdeok-gun, Gyeongsangbuk-do, Korea

경북 영덕군 동부 일원의 지질과 U-Pb 연령

  • Kang, Hee-Cheol (Department of Geological Sciences, Pusan National University) ;
  • Cheon, Youngbeom (Department of Geological Sciences, Pusan National University) ;
  • Ha, Sangmin (Department of Geological Sciences, Pusan National University) ;
  • Seo, Kyunghan (Department of Geological Sciences, Pusan National University) ;
  • Kim, Jong-Sun (Division of Earth and Environmental Sciences & Korea Dinosaur Research Center, Chonnam National University) ;
  • Shin, Hyeon Cho (Department of Earth and Environmental Sciences, Pukyong National University) ;
  • Son, Moon (Department of Geological Sciences, Pusan National University)
  • 강희철 (부산대학교 지질환경과학과) ;
  • 천영범 (부산대학교 지질환경과학과) ;
  • 하상민 (부산대학교 지질환경과학과) ;
  • 서경한 (부산대학교 지질환경과학과) ;
  • 김종선 (전남대학교 지구환경과학부 & 한국공룡연구센터) ;
  • 신현조 (부경대학교 지구환경과학과) ;
  • 손문 (부산대학교 지질환경과학과)
  • Received : 2018.09.19
  • Accepted : 2018.09.29
  • Published : 2018.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study focuses on the investigation of geologic distribution and stratigraphy in the eastern part of Yeongdeok-gun, based on Lidar imaging, detailed field survey, microscopic observations, SHRIMP and LA-MC-ICPMS U-Pb age dating, and a new geological map has been created. The stratigraphy of the study area is composed of the Paleoproterozoic metamorphic rocks consisting of banded gneisses of sedimentary origin and schists ($1841.5{\pm}9.6Ma$) of volcanic origin, Triassic Yeongdeok plutonic rocks ($249.1{\pm}2.3Ma$) and Pinkish granites ($242.4{\pm}2.4Ma$), Jurassic Changpo plutonic rocks ($193.2{\pm}1.9Ma{\sim}188.8{\pm}2.0Ma$) and Fine-grained granites ($192.9{\pm}1.7Ma$), Formations [Gyeongjeongdong Fm, Ullyeonsan Fm. (~108 Ma), Donghwachi Fm.] of the Early Cretaceous Gyeongsang Supergroup and acidic volcanic rocks and dykes erupted and intruded in the Late Cretaceous, Miocene intrusive rhyolitic tuffs ($23.1{\pm}0.2Ma{\sim}22.97{\pm}0.13Ma$) and sedimentary rocks of the Yeonghae basin, and the Quaternary sediments. The Triassic Pinkish granites, Jurassic Changpo plutonic rocks and Fine-grained granites are newly defined plutonic rocks in this study. Miocene intrusive rhyolitic tuffs bounded by the Yangsan Fault, which was first discovered in the north of Pohang city, are believed to play an important role in the understanding of the Miocene volcanic activity and the crustal deformation history on the Korean Peninsula. It is confirmed that The NNE-SSW-striking Yangsan Fault penetrating the central part of the study area and branch faults are predominant in the dextral movement and cutting all strata except the Quaternary sediments.

영덕군 동부 지역의 지질 분포와 층서의 재정립 그리고 양산단층과 가지단층들의 발달양상을 파악하기 위해 라이다 영상분석, 정밀야외 조사를 통한 지층분대 및 지질구조선 파악, 암상별 현미경 관찰, 연대측정(SHRIMP 및 LA-MC-ICPMS 저어콘 U-Pb 연대)을 수행하고 새로운 지질도를 작성하였다. 연구지역은 하부로부터 퇴적기원의 호상편마암 및 화산기원의 편암류($1841.5{\pm}9.6Ma$)로 구성된 고원생대의 변성암류, 중생대 트라이아스기 영덕심성암체($249.1{\pm}2.3Ma$)와 홍색화강암($242.4{\pm}2.4Ma$), 쥐라기 창포심성암체($193.2{\pm}1.9Ma{\sim}188.8{\pm}2.0Ma$)와 세립질화강암($192.9{\pm}1.7Ma$), 상기 지층들을 부정합으로 덮고 있는 전기 백악기의 경상누층군의 지층들[경정동층, 울련산층(~108 Ma), 동화치층], 후기 백악기에 관입 및 분출한 산성 화산암류와 맥암류, 신생대 전기 마이오세에 관입 및 분출한 유문암질 응회암($23.1{\pm}0.2Ma{\sim}22.97{\pm}0.13Ma$)과 중기 마이오세영해분지의 충전물, 그리고 신생대 제4기층으로 구성된다. 트라이아스기의 홍색화강암과 쥐라기의 창포심성암체 및 세립질화강암은 본 연구에서 새롭게 명명된 심성암체들이다. 또한 포항 이북에서 처음으로 발견된 신생대 마이오세의 유문암질 응회암은 관입상의 산상과 함께 단층에 규제되어 분포하는 화산암체로 한반도 신생대 마이오세 화산활동과 지각변형사의 이해에 중요한 역할을 할 것으로 판단된다. 한편 연구지역의 중앙부를 관통하는 북북동 내지 남북 주향의 대규모 주향이동단층인 양산단층과 수조의 가지단층(영덕단층, F1단층, F2 단층)은 우수향 주향이동운동이 절대적으로 우세하며 제4기 지층을 제외한 상술한 모든 지층을 절단하고 있음이 확인된다.

Keywords

References

  1. Chae, B.-G. and Chang, T. W., 1994, Movement history of Yangsan Fault and its related fractures at Chongha-Yongdok area, Korea. Journal of the Geological Society of Korea, 30, 378-394 (in Korean with English abstract).
  2. Chang, K.H., 1970, Geology of upper Mesozoic strata, N, Gyeongsang province, Southern Korea (I). Journal of the Geological Society of Korea, 6, 1-12.
  3. Chang, K.-H., Woo, B.-G., Lee, Jin.-H., Park, S.-O. and Yao, A., 1990, Cretaceous and Early Cenozoic Stratigraphy and History of Eastern Kyongsang Basin, S. Korea. Journal of the Geological Society of Korea, 26, 471-487.
  4. Cheong, C.-S., Kwon, S.-T., and Sagong, H., 2002, Geochemical and Sr-Nd-Pb isotopic investigation of Triassic granitoids and basement rocks in the northern Gyeongsang Basin, Korea: implications for the young basement in the East Asian continental margin. Island Arc, 11, 25-44. https://doi.org/10.1046/j.1440-1738.2002.00356.x
  5. Choi, H.I., Oh, J.H., Shin, S.C. and Yang, M.Y., 1980, Geology and geochemistry of the Gyeongsang strata in Ulsan area. Korea Institute of Energy and Resources Bulletin, 20, 33p (in Korean with English abstract).
  6. Choi, J.-H., Kim, Y.-S. and Klinger, Y., 2017, Recent progress in studies on the characteristics of surface rupture associated with large earthquakes. Journal of the Geological Society of Korea. 53, 129-157 (in Korean with English abstract). https://doi.org/10.14770/jgsk.2017.53.1.129
  7. Choi, J.-H., Klinger, Y., Ferry, M., Ritz, J.-F., Kurtz, R., Rizza, M., Bollinger, L., Davaasambuu, B., Tsend-Ayush, N., Ulziibat, M., Chimed, O. and Demberel, S., 2015, High-resolution surface-rupture map and slip distribution for the 1905 M8 Tsetserleg-Bulnay, Mongolia, earthquake sequence. 2015 AGU Fall Meeting (Abstract), San Francisco, Dec. 14-18, T41B-2874.
  8. Hatae, N., 1936, Geological Atlas of Korea, Yanghae and Yongdok sheet (1:50,000). Geological Survey of Korea.
  9. Hwang, B.H., Lee, J.D. and Yang, K., 2004. Petrological study of the granitic rocks around the Yangsan fault: Lateral displacement of the Yangsan fault. Journal of the Geological Society of Korea 40, 161-178 (in Korean with English abstract).
  10. Hwang, B.H., McWilliams, M., Son, M. and Yang, K., 2007, Tectonic implication of A-type granites across the Yangsan fault, Gigye and Gyeongju areas, southeast Korean Peninsula. International Geology Review, 49, 1094-1102. https://doi.org/10.2747/0020-6814.49.12.1094
  11. Hwang, J.H., Kim, D.H., Cho, D.R. and Song, K.Y., 1996, Explanatory Note of The Andong Sheet, 1:1:250,000. Korea Institute of Geoscience and Mineral Resources, 67p.
  12. Kim, B.K., 1970, A study on the Neogene Tertiary Deposits in Korea. Journal of the Geological Society of Korea, 6, 77-96 (in Korean with English abstract).
  13. Kim, J.-W., 1988, Petrology and fission track dating of the granitic rocks from the vicinity of Yongdok-Onjong area, northeastern Gyeongsang basin, Korea. Ph. D. dissertation, Kyungpook National University, 138p.
  14. Kim, J.-W. and Lee, Y.-J., 1993, Phase Transition of K-feldspar in the Plutonic Rocks from the Vicinity of Yongdok-Uljin Area, Northeastern Gyeongsang Basin, Korea. Journal of the Korean Earth Science Society, 14, 316-325.
  15. Kim, O.J., 1971, Study on the Intrusion Epochs of Younger Granites and their Bearing to Orogenies in South Korea. Journal of the Korean Institute of Mining Geology, 4, 1-9.
  16. Kim, S.-J., Lee, H.-K., Lee, C.-H., and Itaya, T., 1999, K-Ar Ages and Geochemistry of Granitic Rocks in the Northeastern Gyeongsang Basin. Economic and Environmental Geology, 32, 141-150.
  17. Kim, Y.-S. and Sanderson, D.J., 2005, The relationship between displacement and length of faults: a review. Earth-Science Reviews, 68, 317-334. https://doi.org/10.1016/j.earscirev.2004.06.003
  18. Klinger, Y., Choi, J.-H. and Vallage, A., 2016, Fault branching and long-term earthquake rupture scenario for strike-slip earthquakes. In: Thomas, M.Y., Mitchell, T.M., Bhat, H.S. (eds.), Fault Zone Dynamic Processes: Evolution of Fault Properties During Seismic Rupture. American Geophysical Union and John Wiley & Sons, Inc.
  19. Klinger, Y., Michel, R. and King, G.C.P., 2006, Evidence for an earthquake barrier model from Mw -7.8 Kokoxili (Tibet) earthquake slip-distribution. Earth and Planetary Science Letters, 242(3-4), 354-364. https://doi.org/10.1016/j.epsl.2005.12.003
  20. Lee, K. and Jin, Y.G., 1991, Segmentation of the Yangsan fault system: Geophysical studies on major faults in the Kyeongsang Basin. Journal of the Geological Society of Korea, 27, 434-449.
  21. Lee, T.-H., Park, K.-H. and Yi, K., 2012, SHRIMP U-Pb zircon ages of the Nakdong and Ulyeonsan Formations in the Gyeongsang Basin. 2012 Fall Joint Annual Conference of The Geological Societies in Korea (Abstract), Jeongseon, October 24-27, 134 p (in Korean).
  22. Lim, H., Kim, J.-H., Woo, H., Do, J., and Jang, Y.-D., 2016, Petrological Characteristics of the Satkatbong Pluton, Yeongdeok, Korea. Journal of the Petrological Society of Korea, 25, 121-142. https://doi.org/10.7854/JPSK.2016.25.2.121
  23. Park, S.H., Choi, J.-H., and Kim, Y.-S., 2010, Structural Approach to the Generation and Development of the Yonghae Basin. 2010 Fall Joint Annual Conference of The Geological Societies in Korea (Abstract), Gyeongju, October 27-30, 216 p (in Korean).
  24. Peacock, D.C.P. and Sanderson, D.J., 1991, Displacement, segment linkage and relay ramps in normal fault zones. Journal of Structural Geology, 13(6), 721-733. https://doi.org/10.1016/0191-8141(91)90033-F
  25. Sagong, H., Kwon, S.-T. and Ree, J.-H., 2005, Mesozoic episodic magmatism in South Korea and its tectonic implication, Tectonics, 24, TC5002, doi:10.1029/2004TC001720.
  26. Schlupp, A. and Cisternas, A., 2007, Source history of the 1905 great Mongolian earthquakes (Tsetserleg, Bolnay). Geophysical Journal International, 169(3), 1115-1131. https://doi.org/10.1111/j.1365-246X.2007.03323.x
  27. Schwartz, D.P., Haeussler, P.J., Seitz, G.G. and Dawson, T.E., 2012, Why the 2002 Denali fault rupture propagated onto the Totschunda fault: Implications for fault branching and seismic hazards. Journal of Geophysical Research, 117, B11304.
  28. Shin, S.-C., 2013, Revised Fission-track Ages and Chronostratigraphies of the Miocene Basin-fill Volcanics and Basements, SE Korea. Journal of Petrological Society of Korea, 22, 83-115 (in Korean with English abstract). https://doi.org/10.7854/JPSK.2013.22.2.083
  29. Son, M., Song, C.W., Kim, M.-C., Cheon, Y., Cho, H. and Sohn, Y.K., 2015, Miocene tectonic evolution of the basins and fault systems, SE Korea: dextral, simple shear during the East Sea (Sea of Japan) opening. Journal of the Geological Society, 172, 664-680. https://doi.org/10.1144/jgs2014-079
  30. Son, M., Song, C.W., Kim, M.-C., Cheon, Y., Jung, S., Cho, H., Kim, H.-G., Kim, J.S. and Sohn, Y.K., 2013, Miocene Crustal Deformation, Basin Development, and Tectonic Implication in the southeastern Korean Peninsula. Journal of the Geological Society of Korea. 49, 93-118 (in Korean with English abstract).
  31. Um, S.H., Choi, H.I., Son, J.D., Oh, J.H., Shin, S.C. and Yun, H.S., 1983, Geology and geochemical study of Gyeongsang super group in the Gyeongsang Basin. Korea Institute of Geology, Mining, and Minerals (KIGAM), Research Report, no. 36, 118p (in Korean with English abstract).
  32. Walsh, J.J., Bailey, W.R., Childs, C., Nicol, A. and Bonson, C.G., 2003, Formation of segmented normal faults: A 3-D perspective. Journal of Structural Geology, 25(8), 1251-1262. https://doi.org/10.1016/S0191-8141(02)00161-X
  33. Won, C.K., Kang, P.C. and Lee, S.H., 1978, Study on the Tectonic Interpretation and Igneous Pluton in the Gyeong-sang Basin. Journal of the Geological Society of Korea, 14, 79-92.
  34. Yi, K., Cheong, C.-S., Kim, J., Kim, N., Jeong, Y.-J. and Cho, M., 2012a, Late Paleozoic to Early Mesozoic arcrelated magmatism in southeastern Korea: SHRIMP zircon geochronology and geochemistry. Lithos, 153, 129-141. https://doi.org/10.1016/j.lithos.2012.02.007
  35. Yi, K., Cheong, C.-S., Kim, N., Lee, S. and Choi, M.-S., 2012b, Mixing effects in zircon U-Pb ion microprobe dating: An example from a quartzofeldsparthic dyke in the Yeongdeok pluton, southeastern Korea. Geochemical Journal, 46, 261-266. https://doi.org/10.2343/geochemj.2.0202