Sprungmarken

 

Applicability of different OSL and IRSL dating protocols for partially bleached samples

Agnes Novothny1, Gyula Gábris1, Sumiko Tsukamoto2, Manfred Frechen2
1 Physical Geography, Eötvös Lorand University, Budapest
2 2.) Leibniz Institute for Applied Geophysics, Hannover

P 2.7 in Löss und terrestrische Archive

 

Applicability of different OSL and IRSL dating protocols for partially bleached samples

Ágnes Novothny1, Gyula Gábris1, Sumiko Tsukamoto2, Manfred Frechen2,

 

 

  1. Eötvös Loránd University, Institute of Geography and Geology, Department of Physical Geography, Pázmány P. s. 1/c, 1117 Budapest, Hungary. Corresponding author: agnes.novothny@gmail.com

  2. Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany

 

 

 

The paleo-river network of the Carpathian basin differed significantly from the modern river network. At the end of the Pleistocene the drainage systems of the paleo-Danube and -Tisza Rivers have substantially changed due to the higher rate of subsidence along the margins of the Great Hungarian Plain. (Nádor et al., 2007, Gábris and Nádor 2007).

The study area is located near Tiszasas, close to the modern channel of the Tisza River. The profile is located in a sand pit and contains mostly fluvial sand layers in a thickness of 6 m. 10 sand samples were collected from the profile for luminescence dating and 3 samples for heavy mineral analysis to distinguish between the deposits of the palaeo-Danube and palaeo-Tisza Rivers. The aim of the study is to make age constraints for the re-arrangement of the drainage pattern of the area using luminescence dating.

Single aliquot regeneration dose protocol (SAR) has been applied on coarse grained quartz material for Optically Stimulated Luminescence (OSL) dating to determine the equivalent doses of the samples. Strong feldspar contamination of the quartz samples was observed after careful HF treatment. Therefore, different protocols (postIR-OSL and pulsed OSL) were tested and compared to find the best way to determine the De-s of the samples. Besides, post-IR IRSL (Infrared Stimulated Luminescence) protocol was also carried out on the samples for comparison with the quartz ages. The De distributions of the samples are polymodal due to the fluvial origin of the samples, therefore statistical models (minimum age model, central age model) are applied to overcome on the issue of partial bleaching in case of quartz samples. 

Letzte Änderung 26.07.2012