Luminescence dating of well-sorted marine terrace sediments on the southeastern coast of Korea |
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| Institution: | 1. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, South Korea;2. The Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, University of Aarhus, Risø National Laboratory, DK-4000 Roskilde, Denmark;3. Risø National Laboratory, DK-4000 Roskilde, Denmark;4. Isotope Research Team, Korea Basic Science Institute, Daejeon 305-333, South Korea;1. Department of Science, Systems and Models, Roskilde University, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Denmark;3. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Denmark;4. Institute for Ancient Near Eastern Archaeology, Free University Berlin, Germany;5. DNRF Centre “Glass and Time,” Department of Science, Systems and Models, Roskilde University, Denmark;1. Graduate School of Frontier Science, The University of Tokyo, Chiba, 277-8563, Japan;2. Geological Survey of Japan, AIST, Ibaraki, 305-8567, Japan;3. HCMC Institute of Resources Geography, VAST, Ho Chi Minh City, Viet Nam;4. Faculty of Geosciences, University of Bremen, 28359, Bremen, Germany;5. MARUM, University of Bremen, 28359, Bremen, Germany;6. Estuary Research Center, Shimane University, Matsue, 690-8504, Japan;7. Institute for Space-Earth Environmental Research, Nagoya University, Aichi, 464-8601, Japan;1. McDaniel College, Physics Department, Westminster, MD 21157, USA;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark;1. School of Earth and Environmental Sciences, Institute for Photonics and Advanced Sensing (IPAS), and Environment Institute, University of Adelaide, North Terrace Campus, Adelaide SA 5005, Australia;2. School of Chemistry and Physics, Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, North Terrace Campus, Adelaide SA 5005, Australia;3. Centro Nacional de Investigación sobre la Evolución Humana, CENIEH, Paseo Sierra de Atapuerca s/n, 09002 Burgos, Spain;4. Centro Mixto Universidad Complutense – Instituto de Salud Carlos III de Evolución y Comportamiento Humanos, Monforte de Lemos 3-5, Pabellón 14, 28029 Madrid, Spain;5. Departamento de Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;6. Institut de Paleoecologia Humana i Evolució Social, Àrea de Prehistòria, U. Rovira i Virgili, Plaça Imperial Tarraco 1, E-43005 Tarragona, Spain |
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| Abstract: | Along the southeastern coastline of the Korean peninsula, well-developed marine terraces are found at various elevations. The ages of these terraces, and the time of deposition of the terrace sediments are important to our understanding of the geological history of this area during the Quaternary period, and represent a unique record of the regional tectonic activity. Previous efforts to establish a chronology using optically stimulated luminescence (OSL) methods have produced controversial results, particularly because of stratigraphic inconsistency and poor reproducibility. In this paper, 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 our 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. Furthermore, the samples were broadly divided into poorly sorted and well-sorted, based on field evidence. The poorly sorted samples contain friable, weathered gravel clasts, which is a likely post-depositional source of quartz grains. In general, these grains will not have been zeroed prior to deposition, and so the poorly sorted samples are rejected from further age studies. Results obtained from the well-sorted samples are reproducible at each sampling location, and give ages grouping broadly into 50–70 and 110–120 ka, but laterally discontinuous on a scale of tens of km. Our OSL results for the younger group are supported by radiocarbon ages from overlying terrestrial deposits. It is concluded that these results point to considerable tectonic activity in the southeast of Korea during the Late Pleistocene. |
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