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OSL and TL characteristics of fine grain quartz from Mongolian prehistoric pottery used for dating

Solongo S., Richter D., Begzjav T., Hublin J.-J.

Geochronometria

2014

Vol. 41, no. 1

15--23

The OSL, post-IR OSL and pulsed post-IR OSL applied to polymineral grains and calcu-lated by fitting to the data the contributions from fast, medium and slow components revealed that the polymineral samples under study are dominated by the medium component. An increase in De’s with increasing integration intervals was observed, which is considered as an indication of increasing me-dium and decayed fast component; and the equivalent doses obtained using different components or minerals reflect also the shape of the dose distributions. The identified fast component in polymineral sample has photoionization cross section of 1.2±0.02 × 10-17 cm2. The present study shows the use-fulness of the application of different luminescence techniques combined with fitting procedures as a check which should be adopted in dating protocols. Based on luminescence ages obtained on poly-mineral grains from prehistoric pottery samples from the Boroo settlement, Mongolia, which are in agreement with independent age control by 14C on charcoal material, it is argued that the manufactur-ing of Xiongnu – pottery at this site lasted until ca. 130±75 AD.

Different approaches to date bricks from historical buildings

Stella G., Fontana D., Gueli A. M., Troja S. L.

Geochronometria

2014

Vol. 41, no. 3

256--264

The application of Thermally (TL) and Optically (OSL) Stimulated Luminescence on bricks used as building material has allowed solving an chronological issue in the field of historical building dating. The possibility to use one or more methodologies of dating is closely related to the luminescent and granulometric characteristics of the sample. Using some brick samples collected in the church of Sain Seurin in Bordeaux (France), this paper discusses the implications and the possibility to use different approaches and techniques for dating. With this aim luminescence measurements were performed on both polymineral fine grain and quartz inclusion phases extracted from each brick. For Equivalent Dose (ED) and consequently age determination, TL on mixed fine grain fraction (FG), OSL on quartz inclusions (QI) and on mixed fine grain (FG*) fraction, were used. The results obtained suggest the advantage of using OSL technique on fine grain fraction cleaned up by IR stimulation (FG*), but the use of quartz inclusion represents indeed a good alternative.