Maximum age limitation in luminescence dating of Chinese loess using the multiple-aliquot MET-pIRIR signals from K-feldspar |
| |
| Institution: | 1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Department of Earth Sciences, University of Hong Kong, Hong Kong, China;3. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;4. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany;2. Department of Geography, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany;1. Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark;1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;1. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. UCLA Earth, Planetary, and Space Sciences, 595 Charles Young Drive East, Box 951567, 90095 Los Angeles, CA, USA;2. University of Sheffield, Geography, Winter Street, Sheffield, South Yorkshire S10 2TN, UK |
| |
| Abstract: | Numerical dating of loess is important for Quaternary studies. Recent progress in post-infrared infrared-stimulated luminescence (pIRIR) signals from potassium-rich feldspar has allowed successful dating of Chinese loess beyond the conventional dating limit based on quartz optically stimulated luminescence (OSL) signals. In this study we tested the multiple-aliquot regenerative-dose (MAR) pre-dose multiple-elevated-temperature post-IR IRSL (pMET-pIRIR) procedure on samples from the palaeosol S5 (～480 ka) and S8 (～780 ka) layers from the Luochuan and Jingbian sections, respectively. The results show that (1) compared to sensitivity-corrected signal (Lx/Tx), a higher saturation dose is observed for the sensitivity-uncorrected MET-pIRIR signals (Lx), suggesting that MAR is advantageous for dating old samples; (2) negligible fading component can be achieved using the pMET-pIRIR procedure; (3) for the sample from the top of palaeosol S5, De values (1360 + 226/-167 Gy) broadly consistent with expected De (1550 ± 72 Gy) can be obtained using the sensitivity-uncorrected 300 °C MET-pIRIR signal. Our study suggests that a De value of about 1800 Gy may be the maximum dating limit of Chinese loess using the MAR pMET-pIRIR procedure. |
| |
| Keywords: | Anomalous fading Infrared stimulated luminescence MAR pMET-pIRIR Chinese loess |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
