퇴적 환경에 따른 루미네선스 신호의 특성
Characteristics of Luminescence Signals According to the Depositional Environment
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
This study aims to determine the sunlight exposure according to depositional environment to improve the accuracy of optically simulated luminescence (OSL) dating. Sufficient sunlight exposure during transportation of sediment is a basic assumption of the OSL dating, and if the process does not occur enough, the results may be overestimated compared to the actual depositional age. Therefore, the main purpose of this study is to establish a correction method by determining residual or unbleachable dose after sunlight exposure in the actual deposition process, not in the laboratory measurement. Four samples from two sites were collected according to the depositional environment from rivers and coasts, and various OSL signals, including the size of residual dose, degree of dispersion between grains, and OSL signal sensitivity, were measured. As a result, it was confirmed that sediments formed under temporarily high energy environments, such as floods and surges, had relatively high residual dose or large dispersion of residual dose between particles. In further studies, the OSL signal characteristics of river sediments by flow velocity will be identified and the relationship between energy and OSL signal characteristics will be identified in more detail. Moreover, a method of reconstructing the paleo-environment at the time of deposition for existing sediments will be devised. It is expected to provide important information for the frequency of disaster recurrence and prediction of future climate change.
Abstract
This study aims to determine the sunlight exposure according to depositional environment to improve the accuracy of optically simulated luminescence (OSL) dating. Sufficient sunlight exposure during transportation of sediment is a basic assumption of the OSL dating, and if the process does not occur enough, the results may be overestimated compared to the actual depositional age. Therefore, the main purpose of this study is to establish a correction method by determining residual or unbleachable dose after sunlight exposure in the actual deposition process, not in the laboratory measurement. Four samples from two sites were collected according to the depositional environment from rivers and coasts, and various OSL signals, including the size of residual dose, degree of dispersion between grains, and OSL signal sensitivity, were measured. As a result, it was confirmed that sediments formed under temporarily high energy environments, such as floods and surges, had relatively high residual dose or large dispersion of residual dose between particles. In further studies, the OSL signal characteristics of river sediments by flow velocity will be identified and the relationship between energy and OSL signal characteristics will be identified in more detail. Moreover, a method of reconstructing the paleo-environment at the time of deposition for existing sediments will be devised. It is expected to provide important information for the frequency of disaster recurrence and prediction of future climate change.
참고문헌 (19)
- Bailey, R. M., "Statistical modelling of single grain quartz De distributions and the assessment of procedures for estimating burial dose", Quaternary Science Reviews, 25, pp.2475~2502 (2006)
- 최광희, "원산도 해안사구 퇴적층에 대한 OSL 연대측정과 그 의미", 한국지형학회지, 15(4), pp.39~51 (2008), 한국지형학회
- 최성길, "한반도 남동부 해안 해성단구의 분류와 편년에 있어서본 연구에서 도출된 OSL 연대 적용의 한계성 검토", 한국지형학회지, 25(4), pp.63~75 (2018), 한국지형학회[DOI]
- Choi, S. -J., "Estimation of possible maximum earthquake magnitudes of Quaternary faults in the southern Korean Peninsula", Quaternary International, 344, pp.53~63 (2014)
- 정기영, "화강암류 석영의 광여기루미네선스 특성", 광물과 암석, 24(4), pp.321~325 (2011), 한국광물학회
- Jeong, G. Y., "Variations in quartz OSL components with lithology, weathering and transportation", Quaternary Geochronology,, 10, pp.320~326 (2014)
- Kim, M. H., "Estimation of moisture maximizing rate considering an orographic property: Typhoon Rusa case in Gangneung region", Proceedings of the Korea Water Resources Association Conference, pp.1483~1487 (2006)
- Koul, D. K., "The predose phenomenon in the OSL signal of quartz", Radiation Measurements, 42, pp.1265~1272 (2007)
- Li, S. H., "Luminescence sensitivity changes of quartz by bleaching, annealing and UV exposure", Radiation Effects and Defects in Solids, 157, pp.357~364 (2002)
- McKeever, S. W. S., "Optically stimulated luminescence sensitivity changes in quartz due to repeated use in single aliquot readout: experiments and computer simulations", Radiation Protection Dosimetry, 65(1-4), pp.49~54 (1996)
- Moska, P., "Stability of the quartz fast-component in insensitive samples", Radiation Measurements, 41, pp.878~885 (2006)
- Munyikwa Kennedy, "The Development and Luminescence Chronology of a CoastalDune from the Shindu Dunefield, T’aean Peninsula", 대한지리학회지, 39(2), pp.269~282 (2004), 대한지리학회
- Murray, A. S., "Luminescence dating of quartz using an improved singlealiquot regenerative-dose protocol", Radiation Measurements, 32, pp.57~73 (2000)
- 박하은, "석영의 광여기루미네선스 신호 특성을 이용한 제4기 퇴적환경 해석", 지질학회지, 54(4), pp.425~431 (2018), 대한지질학회[DOI]
- Pietsch, T. J., "Fluvial transport as a natural luminescence sensitiser of quartz", Quaternary Geochronology, 3, pp.365~376 (2008)
- Sawakuchi, A. O., "Quartz OSL sensitivity as a proxy for storm activity on the southern Brazilian coast during the Late Holocene", Quaternary Geochronology, 13, pp.92~102 (2012)
- 서종철, "신두리 지역의 고사구(古砂丘)에 대한 OSL연대 측정", 한국지역지리학회지, 11(1), pp.114~122 (2005), 한국지역지리학회
- "Korea Meteorological Administration"[URL]
- "Water Resources Management Information System"[URL]