Testing the application of quartz and feldspar luminescence dating to MIS 5 Japanese marine deposits |
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| Institution: | 1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark;3. Leibniz Institute for Applied Geophysics, Section 3: Geochronology and Isotope Hydrology, Stilleweg 2, Hannover 30655, Germany;4. Neotectonics Research Group, Geoscientific Research Department, Tono Geoscience Center, Sector of Decommissioning and Radioactive Waste Management, Japan Atomic Energy Agency, 959-31 Izumicho-Jorinji, Toki, Gifu 509-5102, Japan;5. Graduated School of Science and Engineering, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8512, Japan;6. Department of Geography, Tokyo Metropolitan University, Hachioji, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, DK-4000 Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, University of Aarhus, Risø Campus, Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Roskilde, Denmark;3. Leibniz Institute for Applied Geophysics, Section S3: Geochronology and Isotope Hydrology, Hannover, Germany;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde 4000, Denmark;3. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel;4. Dead Sea-Arava Science Center, Patio 655, Eilat 88133, Israel;1. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, DK 4000 Roskilde, Denmark;2. Nordic Laboratory for Luminescence Dating, Aarhus University, DTU Nutech, Risø Campus, DK-4000 Roskilde, Denmark |
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| Abstract: | The applicability of both quartz and feldspar luminescence dating was tested on twenty-five samples from a marine succession now forming a coastal cliff at Oga Peninsula, Honshu Island, Japan. The quartz optically stimulated luminescence (OSL) signal shows thermal instability and linear modulated (LM)-OSL analysis revealed the dominance of a slow component. When compared with independent age control provided by two marker tephras, the quartz OSL ages grossly underestimate the depositional age. In contrast, potassium (K)-rich feldspar is a suitable dosimeter when measured using post-IR infrared stimulated luminescence (IRSL) at 225 °C (pIRIR225). Scanning electron microscope (SEM) analyses on the feldspar extracts revealed that the grains are amorphous with small crystalline inclusions; using standard internal dose rate parameters, this would result in a too large dose rate. Dose rates were calculated using the observed grain size of 40 ± 20 μm with an assumed K concentration of 12.5 ± 0.5%. The fading corrected pIRIR225 ages agree well with independent age control, and the sediments of the Katanishi Formation were deposited between 82 ± 6 and 170 ± 16 ka. This study demonstrates that pIRIR dating of feldspar is a powerful chronological tool for the dating of sediments of volcanic origin. |
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| Keywords: | Quartz OSL Slow OSL component Post-IR IRSL Internal dose rate Japan |
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