Browse > Article
http://dx.doi.org/10.22807/KJMP.2020.33.4.349

Development History of Neotectonic Fault Zone in the Singye-ri Valley, Oedong-eup, Gyeongju, Korea  

Kang, Ji-Hoon (Department of Earth and Environmental Sciences, Andong National University)
Son, Moon (Department of Geological Sciences, Pusan National University)
Ryoo, Chung-Ryul (Center for Active Tectonics, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.4, 2020 , pp. 349-359 More about this Journal
Abstract
The Ulsan Fault Zone (UFZ) of NNW trend is developed in the Gyeongsang Basin, the southeastern part of the Korean Peninsula, and the Quaternary faults have been found around the UFZ. The faults generally thrust the Bulguksa igneous rocks of Late Cretaceous-Early Tertiary upon the Quaternary deposits or are developed within the Quaternary deposits. They mainly show the reverse-slip sense of top-to-the west movement. The lines connecting the their outcrop sites show a zigzag-form which is similar to the orientation of their fault surfaces which show the various trends, like (W)NW, N-S, (E)NE, ENE trends. The E-W trending dextral strike(-slip) fault is found in the Quaternary deposits of the Singye-ri valley. It cuts the N-S trending reverse fault and are cut by the N-S trending thrust fault again. Two types of at least two times of Quaternary tectonic movements related to the formation of neotectonic fault zone in the Singye-ri valley are considered from such the geometric and kinematic characteristics of Quaternary faults. One is the reverse faulting of N-S trend by the E-W directed 1st compression and associated the strike-slip tear faulting of E-W trend, and then the thrust faulting of N-S trend by the E-W directed 2nd compression. The other is the reverse faulting of N-S trend, and then the dextral strike-slip faulting of E-W trend by the NW-SE directed compression, and then the thrust faulting of N-S trend. In this paper is suggested the development history of Singye-ri neotectonic fault zone on the basis of the various orientations of Quaternary fault surfaces around the UFZ, and the zigzag-form connecting line of their outcrop sites, and the compressive arc-shaped lineaments which convex to the west reported recently in the Yangsan Fault Zone.
Keywords
Ulsan Fault Zone; Singye-ri valley; Quaternary faults; Quaternary tectonic movement; development history of neotectonic fault zone;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Berthe, D., Choukroune, P. and Jegouzo, P., 1979, Orthogeneiss, mylonite and non coaxial deformation of granites: the example of the South Armorican Shear Zone. Journal of Structural Geology, 1, 31-42.   DOI
2 Chang, T.W., 2001, Quaternary tectonic activity at the eastern block of the Ulsan fault. Journal of the Geological Society of Korea, 37, 431-444 (in Korean with English abstract).
3 Choi, P.-Y., Lee, C.-B., Ryoo, C.-R., Choi, Y.S., Kim, J.-Y., Hyun, H.-J., Kim, Y.-S., Kim, J.-Y. and Chwae, U., 2002, Geometric analysis of the Quaternary Malbang Fault: Interpretation of borehole and surface data. Journal of the Geological Society of Korea, 38, 163-174 (in Korean with English abstract).
4 Chwae, U. and 57 others, 1998, Final report of the re-evaluation to the design base earthquake considering the Yangsan Fault. Technical Note of Korea Institute of Geology, Mining and Materials, Korea Electric Power Corporation, KR-B-255-7-1998, 1,694p (in Korean).
5 JGGK, 1922, Geological report of the Choyo sheet (1: 50,000), Korea. Japanese Government General of Korea, 6p (in Japanese).
6 Kim, D.H., Hwang, J.H., Park, K.H. and Song, K.Y., 1998, Geological report of the Pusan sheet (1: 250,000), Korea. Korea Institute of Geology, Mining & Materials, 62p (in Korean with English abstract).
7 Ryoo, C.-R., Lee., B.J., Son, M., Lee, Y.H., Choi, S.-J., and Chwae, U., 2002, Quaternary faults in Gaekok-ri, Oedong-eup, Gyeongju, Korea. Journal of the Geological Society of Korea, 38, 309-323 (in Korean with English abstract).
8 Kim, M.-C., Jung, S., Yoon, S., Jeong, R.-Y., Song, C.W., and Son, M., 2016, Neotectonic crustal deformation and current stress field in the Korean Peninsula and their tectonic implications: A review. Journal of the Petrological Society of Korea, 25, 169-193 (in Korean with English abstract).   DOI
9 Ryoo, C,-R., 2019, Quaternary faulting and compressive arc-shaped lineaments developed around Yangsan Fault Zone on the southern boundary between Samnam-myeon and Samdong-myeon, Ulju-gun, Ulsan, Korea. Proceedings of the Annual Joint Conference, the Mineralogical Society of Korea and the Petrological Society of Korea, May 30-31, 2019, Chuncheon, Korea, 48-52 (in Korean).
10 Ryoo, C.-R., Chwae, U., Choi, S.-J., and Son, M., 2001, Discussion on newly known Quaternary faults in Singye-ri and Hwalseong-ri, Oedong-eup, Gyeongju along eastern part of the Ulsan Fault Zone, Korea. Abstracts of 56th Annual Meeting of the Geological Society of Korea, Daegu, Korea, 2 (in Korean).
11 Ryoo, C.-R., Yang, K., Lee, S.-W., and Kim, I.-S., 1996, Quaternary fault in the vicinity of the Ulsan fault. The Journal, College of Education, Pusan National University, Pusan, Korea, 33, 311-327 (in Korean with English abstract).
12 Simpson, C. and Schmid, S., 1983, An evaluation of criteria to deduce the sense of movement in sheared rocks. Geological Society of America Bulletin, 94, 1281-1288.   DOI