Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Principle and Application of 'Image-mapping' in-situ U-Pb Carbonate Age-dating

'Image-mapping' in-situ U-Pb 탄산염광물 연대측정법의 원리 및 적용

  • Ha Kim (Department of Earth System Sciences, Yonsei University) ;
  • Seongsik Hong (Department of Earth System Sciences, Yonsei University) ;
  • Chaewon Park (Department of Earth System Sciences, Yonsei University) ;
  • Jihye Oh (Deep-sea and Seabed Mineral Resources Research Center, Korea Institute of Ocean Science and Technology) ;
  • Jonguk Kim (Deep-sea and Seabed Mineral Resources Research Center, Korea Institute of Ocean Science and Technology) ;
  • Yungoo Song (Department of Earth System Sciences, Yonsei University)
  • 김하 (연세대학교 지구시스템과학과) ;
  • 홍성식 (연세대학교 지구시스템과학과) ;
  • 박채원 (연세대학교 지구시스템과학과) ;
  • 오지혜 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 김종욱 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 송윤구 (연세대학교 지구시스템과학과)
  • Received : 2023.02.14
  • Accepted : 2023.04.27
  • Published : 2023.04.28
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Abstract

We introduce a new 'image-mapping' in-situ U-Pb dating method using LA-ICP-MS, proposed by Drost et al. (2018), and show the characteristics and usability of this method through several examples of absolute age results determined by first applying it to samples from the Joseon Supergroup of the Early Paleozoic Era in Korea. Unlike the previous in-situ spot analysis, this in-situ U-Pb dating method for carbonate minerals can determine the absolute age with high reliability by applying the 'image-mapping' method of micro-sized domains based on micro-textural observation, as well as determine the absolute age of multiple geological 'events' that occurred after deposition. This was confirmed in the case of determining the syn-depositional age and the multiple post-depositional ages from carbonate minerals of the Makgol and the Daegi Formations. Therefore, if the 'image-mapping' in-situ U-Pb dating method is applied to determine the absolute age of various types of carbonate minerals that exist in various geological environments throughout the geologic era, it will be possible to secure new geological age information.

본 연구는 Drost et al. (2018)이 제안한 LA-ICP-MS를 이용한 새로운 'image-mapping' in-situ U-Pb 연대측정법을 소개하고, 국내 전기고생대 조선누층군 시료를 대상으로 처음 적용하여 결정한 절대연대 결과 사례를 통해 이 방법의 특성과 활용성을 알리고자 한다. 탄산염광물을 대상으로 하는 'image-mapping' in-situ U-Pb 연대측정법은 미세조직 관찰을 기초로 미소영역의 'image-mapping' 법을 적용하여, 기존의 점 분석(spot analysis) in-situ 분석법과는 달리, 신뢰성 높은 절대연대를 결정할 수 있을 뿐 아니라, 생성 이후 일어난 복수의 지질학적 '사건' 절대연대도 결정할 수 있다. 막골층과 대기층 탄산염광물로부터 퇴적연대와 함께 복수의 퇴적 이후의 연대를 결정한 적용 사례에서 이를 확인하였다. 따라서 이 같은 'image-mapping' in-situ U-Pb 연대측정법이 전 지질시대에 걸쳐 다양한 지질학적 환경에서 존재하는 다양한 형태의 탄산염광물 절대연대 결정에 적용된다면, 새로운 지질학적 연대정보 확보가 가능할 것이다.

Keywords

Acknowledgement

본 연구는 한국연구재단의 이공학개인기초연구지원사업(Grant No.2018051418)의 일환으로 수행되었음을 밝힙니다.

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