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Luminescence ages of quaternary marine sediments on the eastern coast of Korea and their geomorphic implications

서울대학교 대학원
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  • 광여기루미네선스 (Osl)
  • Optically Stimulated Luminescence (Osl)
  • Osl연대
  • Osl Age
  • 해안단구
  • Marine Terrace
  • 풍성사구
  • Aeolian Sand Dune
  • 지역적 지반안정성
  • Local Crustal Stability
  • 석영
  • Quartz
  • 단일시료재현법 (Sar)
  • Single-Aliquot Regenerative-Dose (Sar) Protocol
  • 열전처리
  • Preheat
  • 시험방사선
  • Cut-Heat
  • Test-Dose
  • Chemistry
  • Earth Science


Several sets of marine terrace are exposed along the southeastern coast of the Korean peninsula. The formation ages of these terraces have attracted considerable attention because they provide essential information on local crustal stability. Over the last few years, considerable effort has been put into the determination of these ages using optically stimulated luminescence (OSL) dating of the marine sediments from which the terraces were built. However, previous efforts to establish a chronology using OSL methods have produced controversial results, particularly because of stratigraphic inconsistency and poor reproducibility. In this work, the application of OSL dating based on the single-aliquot regenerative-dose (SAR) protocol for quartz is investigated. The dependence of equivalent dose on the preheat and cut-heat temperatures (thermal treatment of the regeneration and test-doses, respectively) are examined. Linearly modulated luminescence signals from chemically cleaned quartz samples are used to identify the presence of a thermally unstable component with a large optical cross-section (component A¢¥ ), which in part affects the ability to correct for sensitivity changes during measurements, and thus the reliability of the equivalent dose estimates. In some samples, a higher heat treatment after the test-dose is shown to improve the ability to measure a dose given in the laboratory before any heat treatment (dose recovery test). This higher temperature treatment effectively removes component A¢¥, and hence improves sensitivity correction. Despite of the removal of component A¢¥, the samples from one site (Oryu Terrace) still exhibit various undesirable OSL characteristics, which result in stratigraphically inconsistent OSL ages. To resolve this stratigraphic inconsistency, these characteristics are investigated, and luminescence component separation used. Results thus obtained from 2nd terraces, which is located at the elevation of 7~18m (a.m.s.l), ar

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