Naslov
Current achievement in absolute dating techniques of mortar

Autori
Sironić, Andreja ; Borković, Damir ; Barešić, Jadranka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
07th International Science Conference Methodology an Archaeometry, MetArh / - , 2019, 39-39

Skup
07th International Science Conference Methodology an Archaeometry, MetArh

Mjesto i datum
Zagreb, Hrvatska, 02.12.2019. - 03.12.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
14C mortar dating, MODIS - mortar dating inter-comparison, pyrogenic carbonate

Sažetak
Mortar can be absolutely dated by physical methods of radioactive carbon decay (radiocarbon), optically stimulated luminescence (OSL) or by electronic paramagnetic resonance spectroscopy (EPR). However, to this day there is no consensus on the method or on the unique way of sample preparation that would always provide the true date. The mostly used method is radiocarbon dating of pyrogenic carbonate created simultaneously with the mortar sample. However, the problem of extracting the pure pyrogenic fraction without carbonates originating from unburned limestone used for mortar production can often give too old dates. In order to find the most reliable method of mortar dating, the Mortar Dating Inter- comparison Study was conducted (MODIS, Hajdas et al. 2017 ; Hayen et al. 2017). Four mortar samples were distributed to seven radiocarbon and one OSL laboratory. The dates provided by mortar dating were compared by 14C dates obtained from charcoal associated with production of mortars. For two samples laboratories provided dates similar to the consensus value, and one sample was found to be too heterogeneous for dating. For one sample all the laboratories provided too young dates, implying that the mortar was re-burned so the analyzed pyrogenic carbonates actually pointed to the last time the construction was on fire, not to the actual building of the construction. The new mortar dating inter-comparison is in progress (MODIS 2). Three mortar samples have been distributed among 12 radiocarbon laboratories. The Zagreb Radiocarbon Laboratory is also included in MODIS 2, after being recognized for the mortar dating of the Skopje Aqueduct (Sironić et al. 2019). The most promising methods for extraction of pyrogenic carbonate form mortars applied in the MODIS will be presented. References: Hajdas et al. 2017. Radiocarbon 59(6), 1845 - 1858 Hayen et al. 2017 Radiocarbon 59(6), 1859 - 1871 Sironić, et al. 2019. Radiocarbon DOI: https://doi.org/10.1017/RDC.2019.66

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Arheologija

POVEZANOST RADA