ESR and TL age determination of caliche nodules |
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| Institution: | 1. Physics Department, Oklahoma State University, Stillwater, OK 74078, USA;2. Department of Radiation Oncology, The University of Oklahoma HSC, Oklahoma City, OK 73104, USA;3. Landauer, Inc., Stillwater Crystal Growth Division, Stillwater, OK 74074, USA;4. Department of Radiation Safety and Security, Paul Scherrer Institut (PSI), Villigen PSI, Switzerland;1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA USA;2. Laboratoire Hubert Curien − UMR CNRS 5516, 18 rue du Pr. Benoît Lauras, F-42000 Saint Etienne, France;3. CEA, DAM, DIF, F-91297 Arpajon, France |
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| Abstract: | Feasibility of dating caliche nodules by ESR and TL is investigated. For both methods the properties of the dating signal are described. Chemical composition as well as TL glow curves of caliches originating from different localities exhibit some differences. Due to the complexity of the TL glow curves, some samples required a special post-annealing procedure in order to resolve the main TL peak for age determination. Typical ESR calcite signals do not exist in caliche, therefore usefulness of the g = 2.0040 ESR signal is studied. The results of TL and ESR ages are found to be compatible except for two samples. Possible causes of the discrepancy in these samples are discussed. It is shown that, with proper treatment of the radiation-induced signals, it was possible to date caliche formations older than 350 ka, which is not achieveable with other methods like uranium series disequilibrium and/or radiocarbon dating. |
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