Single quartz grain electron spin resonance (ESR) dating of a contemporary desert surface deposit,Eastern Desert,Egypt |
| |
| Institution: | 1. Departement Geografie-Geologie, Laboratorium voor Stratigrafie, Afdeling Historische Geologie, Katholieke Universiteit Leuven, Redingenstraat 16, 3000 Leuven, Belgium;2. Departement Natuurkunde, Afdeling Halfgeleiderfysica, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium;1. University of Washington, Department of Anthropology, Box 353412, Seattle, WA 98195-3412, USA;2. McDaniel College, Department of Physics, Westminster, MD 21157, USA;1. Department of Chemistry, Faculty of Science (Men''s Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt;2. Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khod, Oman;1. Direction de l''Archéologie, Service Public de Wallonie, 5100 Namur, Belgium;2. Directorate Earth and History of Life, Royal Belgian Institute of Natural Sciences, 1000 Brussels, Belgium;3. Department of Geology and Applied Geology, University of Mons, 7000 Mons, Belgium;4. Laboratoire Halma Ipel (UMR 8164), University Lille 1, 59655 Villeneuve d''Ascq Cedex, France;5. Department of Geography, University of Liège, Sart-Tilman, B-12A, 4000 Liège, Belgium;6. ArcheoGeolab, Pal Maleterstraat 42, 3573 PH Utrecht, The Netherlands |
| |
| Abstract: | Signal resetting by sunlight prior to burial is a crucial assumption in electron spin resonance (ESR) dating of sediments. This resetting process is expected to be completed to a greater extent in arid than in fluvial environments. The present paper investigates the natural and artificially irradiated signal intensity of Ti related centres in single quartz grains collected from the desert surface (Eastern Desert, Egypt) in order to test this hypothesis. The results suggest that in most grains both the Ti–Li and Ti–H signal are completely reset to zero. Additive dose curves based on the sum of both Ti centres show an anomaly in the low dose region. Possible causes for this behaviour are briefly discussed. Three fitting procedures are conducted and each of them shows a different palaeodose distribution with a rather large spread in DE values. It is concluded that similar fossil deposits would be datable by single grain ESR using Q-band measurements of the Ti–Li or Ti–H signals in quartz. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
