Estimation of paleo-firing temperatures using luminescence signals for the volcanic lava baked layer in Datong,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. GeoQuest and Wollongong Isotope Geochronology Lab, School of Earth and Environmental Sciences, University of Wollongong, Australia;2. Department of Physical Geography and Quaternary Geology, Stockholm University, 10691, Stockholm, Sweden;1. Department of Applied Physics, Okayama University of Science, Okayama, 700-0005, Japan;2. Humanities and Social Sciences, Nara Women''s University, Nara, 630-8506, Japan;3. Department of Environmental Systems, Rissho University, Kumagaya, 360-0194, Japan;1. School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, PR China;2. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, PR China;3. Department of Applied Mathematics, The Hong Kong Polytechnic University, Hung Hum, Hong Kong;4. College of Mathematics and Statistics, Shenzhen University, Shenzhen, PR China;1. School of Computer Science and Engineering, Nanjing University of Science and Technology, China;2. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong;3. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, China;4. TCL Corporate Research (Hong Kong) Co., Limited, Hong Kong;1. Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China;2. WHO Collaborating Centre for Infectious Disease Epidemiology and Control, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China;1. Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;2. Department of Environmental Sciences, Norwegian University of Life Sciences, PO Box 5003, NO-1432 Ås, Norway |
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| Abstract: | Eight paleo-fired samples from the baked layer in different depths under the lava and one unfired sample were collected from Datong, China. Fine quartz grains (4–11 μm) from samples were used for probing into relationship between luminescence signals and paleo-firing temperatures. Findings from the re-firing experiments indicated that using thermoluminescence (TL) and optically stimulated luminescence (OSL) sensitivity changes could estimate the paleo-firing temperatures of samples: (1) 110 °C TL sensitivity change rate against the re-firing temperature can tell whether the sample has been fired to temperatures above 500 °C or not; (2) 150 °C TL sensitivity against the re-firing temperature can indicate whether the sample has been fired to temperatures above 900 °C or not; (3) the more specific paleo-firing temperatures can be estimated by comparing the ratio of OSL and 150 °C TL sensitivities against re-firing temperatures. Results showed that the paleo-firing temperatures of the eight lava-baked samples decreased exponentially with the distance from the lava. Based on the estimated temperature profile, the temperature of the lava was estimated to be about 1100 °C. |
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| Keywords: | Datong volcano Baked layer Temperature Luminescence Sensitivity Fine grain quartz |
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