Multiple approaches to date Japanese marker tephras using optical and ESR methods |
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| Institution: | 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. Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, UNSW, Sydney, NSW 2052, Australia;2. Waikato Radiocarbon Dating Laboratory, University of Waikato, Private Bag 3105, Hamilton, New Zealand;3. National Institute of Water and Atmospheric Research, 41 Market Place, Auckland 1010, New Zealand;4. Department of Geography, Exeter University, Devon EX4 4RJ, United Kingdom;1. Graduate School “Human Development in Landscapes”, University Kiel, Neufeldstraße 10, D-24118 Kiel, Germany;2. Landesamt für Denkmalpflege, Dendrochronologisches Labor, Fischersteig 9, D-78343 Hemmenhofen, Germany;1. SUERC, Scottish Enterprise and Technology Park, Rankine Avenue, East Kilbride, Scotland, G75 0QF, UK;2. Department of Anthropology, Bates College, Pettengill Hall, Lewiston, ME 04240, USA;1. Universidade Federal do Paraná, Curitiba, Brazil;2. Istituto Italiano di Paleontologia Umana, Roma, Italy;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 |
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| Abstract: | The present study aimed to test reliability of luminescence and electron spin resonance (ESR) methods to date tephra. We investigated on three Japanese marker tephras, Ikeda-ko (6.4 ka), Aira-Tn (30 ka) and Aira-Iwato (45–50 ka). A systematic studies were performed using different minerals (quartz and feldspar), different grain fractions (75–250 and 250–500 μm), different luminescence and ESR signals, like optically stimulated luminescence (OSL) of quartz, infrared stimulated luminescence (IRSL) of feldspar, including recently developed least faded post infrared IRSL (pIR-IRSL), and ESR signals from paramagnetic centers Al and Ti–Li of quartz. Ages obtained using pIR-IRSL signal of plagioclase with preheat of 320 °C, 60 s and stimulation at 300 °C are consistent with the reference ages. High dose detection range (up to ∼600 Gy) and accurate age estimation enable pIR-IRSL of feldspar a promising methodology to date quaternary tephra. ESR ages from quartz are grossly correlated with the reference ages but large deviation and large associated errors are observed, possibly due to either low signal to noise ratio or heterogenous dose response of different aliquot in multiple aliquot additive dose (MAAD) approach. |
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| Keywords: | Tephra Plagioclase pIR-IRSL ESR of quartz ESR sensitivity |
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