The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Infrared Stimulated Luminescence (IRSL) Dating of a Tidal Flat, West Coast of Korea

적외선 여기 루미네센스를 이용한 조간대 퇴적층의 연대추정

  • 최만식 (한국기초과학지원연구원 동위원소분석팀) ;
  • 한정희 (한국기초과학지원연구원 동위원소분석팀) ;
  • 최정헌 (서울대학교 지구환경과학부) ;
  • 정창식 (한국기초과학지원연구원 동위원소분석팀) ;
  • 홍덕균 (한국기초과학지원연구원 동위원소분석팀)
  • Published : 2002.02.28
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Abstract

Optical dating, using infrared stimulation of K-feldspar grains, was undertaken to determine the sedimentation rate of a recently deposited tidal flat on the western coast of Korea. Very low luminescence of the natural surface sample confirms that the materials we investigated were well bleached at deposition. The five IRSL ages obtained show a reasonable stratigraphic correlation with the expected sedimentation rate of approximately 50cm/100yr. In addition the recuperation effect due to thermal transfer was discussed. We conclude that the optical dating used here shows a great promise to determine the sedimentation rates of tidal flats.

장석을 적외선으로 조사하여 측정된 루미네센스를 이용하여 서해안 지역에 최근 퇴적된 갯벌 퇴적층의 연대를 산출하였다. 연대를 결정하기 전 조사된 표층시료의 시험에서 시료채취 장소의 환경은 루미네센스 연대 측정법을 적용하기에 매우 적합한 것으로 나타났다. 산출된 연대는 퇴적층에 따라 비교적 순차적으로 나타났으며, 각 층에서 산출된 연대의 중심연대를 기준으로 볼 때 시료 채취장소의 퇴적율은 100년 동안 약 50cm정도를 보였다. 또한, 사용된 시료의 열적전환에 의한 회귀현상에 대한 연구가 기술되었다. 광 여기 루미네센스 연대 측정법은 앞으로 갯벌의 퇴적환경을 연구하는데 크게 기여할 것으로 생각된다.

Keywords

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