Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Reactivated Timings of Yangsan Fault in the Sangcheon-ri Area, Korea

상천리 일대 양산단층의 재활동 연대

  • Song, Yungoo (Department of Earth System Sciences, Yonsei University) ;
  • Park, Changyun (Department of Earth System Sciences, Yonsei University) ;
  • Sim, Ho (Department of Earth System Sciences, Yonsei University) ;
  • Choi, Woohyun (Department of Earth System Sciences, Yonsei University) ;
  • Son, Moon (Department of Geological Sciences, Pusan National University) ;
  • Khulganakhuu, Chuluunbaatar (Department of Earth System Sciences, Yonsei University)
  • 송윤구 (연세대학교 지구시스템과학과) ;
  • 박창윤 (연세대학교 지구시스템과학과) ;
  • 심호 (연세대학교 지구시스템과학과) ;
  • 최우현 (연세대학교 지구시스템과학과) ;
  • 손문 (부산대학교 지질환경과학과) ;
  • Received : 2016.04.12
  • Accepted : 2016.04.27
  • Published : 2016.04.28
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Abstract

Here we firstly present that a timing of reactivated event of Yangsan fault, the major fault in the southeastern Korean Peninsula, by using combined approaches of the optimized illite-polytype quantification, the K-Ar age-dating, and the recently developed illite-age-analysis (IAA) approach for the fault clays from Sangcheon-ri area of Yangsan main fault line. Two chronological record of brittle fault-activation event at about 41.5~43.5 and 50.7 Ma were determined from 3 fault gouges suggesting a crucial reactivation time-scheme. Furthermore, the regional processes that drive tectonics to form and reactivate the Yangsan fault may be explained from the chronological analysis for additional sites along the Yangsan fault.

본 연구에서는 한반도 남동부지역 주요단층인 양산단층대 주단층이 지나는 울산시 상천리일대 3개 단층점토 지점의 각 3개 입도분리 시료에 대한, 일라이트 폴리타입 정량분석법, K-Ar 연대측정, 일라이트 혼합연대해석법(IAA)법 적용 및 해석을 통해 단층 재활동 절대연대를 결정하였다. 연대측정 및 해석결과, 상천리지점 단층시료에서 41.5~43.5 및 50.7 Ma의 2회 천부단층 재활동연대를 결정하였다. 본 연구결과는 양산단층에 대한 최초의 단층 재활동연대를 직접적인 방법으로 결정한 것으로, 양산단층 생성시기가 이 시기 이전이었으며, 최소 2회 이상의 재활동이 있었음을 의미한다. 양산단층대의 단층점토에 대한 추가적인 연대측정이 이루어질 경우 양산단층의 재활동 시간대를 구체화할 수 있을 것으로 생각된다.

Keywords

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