Luminescence dating of volcanic eruptions in Datong,northern China |
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| Institution: | 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. Department of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;2. Key Laboratory of Geospace Environment and Geodesy of the Ministry of Education, Wuhan University, Wuhan 430079, China;3. Seismological Bureau of Yunnan Province, Kunming 650224, China;1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8567, Japan;2. Japan Society for the Promotion of Science, Japan;1. SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''An 710075, China;2. Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, UK;3. McDonald Institute for Archaeological Research, University of Cambridge, Downing Street, Cambridge CB2 3ER, UK;4. Institute of Physics – Centre for Science and Education, Silesian University of Technology, 44-100 Gliwice, Poland;1. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;2. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China;3. Exploration and Development Institute of Shengli Oilfield, Dongying 257015, China |
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| Abstract: | In this study, fine-grain quartz was used for luminescence dating for lava baked samples from different sites in Datong. Optical stimulated luminescence (OSL), thermal transferred OSL (TT-OSL)/recuperated OSL (Re-OSL) and thermoluminescence (TL) dating protocols were applied. For these samples, the OSL signals saturate at about 300–400 Gy, which limits their age to less than 100 ka based on their ambient dose rates. The TT-OSL/Re-OSL method has poor dose recovery. TL dating gives reliable results, and multiple-aliquot regenerative-dose TL method with sensitivity change correction based on the 325 °C TL peak of a test dose can be applied for samples up to 400 ka. The results indicate that the ages of the volcanoes in Datong are from 380 ka to 84 ka. The volcanic activity started earlier in the southeast area than those in the northwest part, which is consist with the literature data. |
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| Keywords: | Datong volcanoes Thermoluminescence dating Fine grain quartz |
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