<abstract xmlns="http://www.w3.org/1999/xhtml">Both Optically Stimulated Luminescence (OSL) dating and 14C dating are main dating method for archaeological sites, while their disagreements are quite often. In the Qaidam Basin (QB), human activity remains (HMRs) are frequently found within aeolian sediments, offering opportunities to make comparison between OSL and 14C ages, and to discuss their potential disagreements in archaeological sites. In this study, we present comparison between 18(10 of them had been published) OSL and 17 AMS 14C ages for samples from aeolian sediments in the eastern QB, including some samples from archaeological sites. Comparisons show better agreement in natural aeolian section, but more disagreements in sections with many HARs. This should be due to postdepositional anthropogenic disturbance, which can cause different influences to OSL and 14C ages. The age disagreement might display their different significances, with 14C chronology represent human activities, while OSL chronology more likely to reveal ages of original stratigraphy. Field hearth experiment was taken to check to what extent can heat from a hearth affect luminescence signals in the surrounding sediments. Results show that both OSL and Thermoluminescence signals in sediments under the hearths are not easy to be reset by the heat due to the poor downward thermal conductivity into the humid soil. This reminds the risk of OSL age overestimation for hearths. This study emphasizes the importance of cross-check between different dating methods for chronology building in archaeological contexts, and the necessity to analyze the dating materials, depositional process, and post-depositional disturbance when age disagreement is discovered.</abstract>

Both Optically Stimulated Luminescence (OSL) dating and 14C dating are main dating method for archaeological sites, while their disagreements are quite often. In the Qaidam Basin (QB), human activity remains (HMRs) are frequently found within aeolian sediments, offering opportunities to make comparison between OSL and 14C ages, and to discuss their potential disagreements in archaeological sites. In this study, we present comparison between 18(10 of them had been published) OSL and 17 AMS 14C ages for samples from aeolian sediments in the eastern QB, including some samples from archaeological sites. Comparisons show better agreement in natural aeolian section, but more disagreements in sections with many HARs. This should be due to postdepositional anthropogenic disturbance, which can cause different influences to OSL and 14C ages. The age disagreement might display their different significances, with 14C chronology represent human activities, while OSL chronology more likely to reveal ages of original stratigraphy. Field hearth experiment was taken to check to what extent can heat from a hearth affect luminescence signals in the surrounding sediments. Results show that both OSL and Thermoluminescence signals in sediments under the hearths are not easy to be reset by the heat due to the poor downward thermal conductivity into the humid soil. This reminds the risk of OSL age overestimation for hearths. This study emphasizes the importance of cross-check between different dating methods for chronology building in archaeological contexts, and the necessity to analyze the dating materials, depositional process, and post-depositional disturbance when age disagreement is discovered.

Different implications of OSL and radiocarbon ages in archaeological sites in the Qaidam Basin, Qinghai-Tibetan Plateau

College of Resources and Environment, Linyi University, Linyi 276000,

State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074,

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Both Optically Stimulated Luminescence (OSL) dating and 14C dating are main dating method for archaeological sites, while their disagreements are quite often....

Different implications of OSL and radiocarbon ages in archaeological sites in the Qaidam Basin, Qinghai-Tibetan Plateau

Publié en ligne: 30 déc. 2016

Pages: 188 - 200

Reçu: 30 mars 2016

Accepté: 03 nov. 2016

DOI: https://doi.org/10.1515/geochr-2015-0048

Mots clés
Luminescence dating, Thermoluminescence, Radiocarbon dating, Archaeological site, Anthropogenic disturbance, Qaidam Basin

© 2016 L-P. Yu

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Different implications of OSL and radiocarbon ages in archaeological sites in the Qaidam Basin, Qinghai-Tibetan Plateau

Publié en ligne: 30 déc. 2016

Pages: 188 - 200

Reçu: 30 mars 2016

Accepté: 03 nov. 2016

DOI: https://doi.org/10.1515/geochr-2015-0048

Mots clésLuminescence dating, Thermoluminescence, Radiocarbon dating, Archaeological site, Anthropogenic disturbance, Qaidam Basin

© 2016 L-P. Yu

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Luminescence dating, Thermoluminescence, Radiocarbon dating, Archaeological site, Anthropogenic disturbance, Qaidam Basin