Optically Stimulated Luminescence Dating of Earthenware from the Nam Tok Khao Pang Archaeological Site, Kanchanaburi, Thailand
DOI:
https://doi.org/10.55713/jmmm.v35i4.2389Keywords:
Optically stimulated luminescence dating, Accumulated dose, Single aliquot regeneration protocol, Annual dose, Late NeolithicAbstract
The Nam Tok Khao Pang archaeological site, located in Tha Sao subdistrict, Sai Yok district, Kanchanaburi province, Thailand, is a limestone cave where numerous artifacts, including black-burnished earthenware fragments with in-curving rims, out-curving rims, and carinated bodies, have been discovered. Mineralogical and microstructural analyses using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) identified quartz (SiO₂) as the dominant mineral phase within a partially sintered silicate matrix. The absence of vitrification and the presence of mineral impurities indicate that the earthenware was fired at temperatures between 900°C and 1000°C. To determine the age of these ceramics, optically stimulated luminescence (OSL) dating was conducted using the quartz inclusion method and the single aliquot regeneration (SAR) protocol. Annual dose rates were estimated from uranium (U), thorium (Th), and potassium (K) concentrations measured by laser ablation–inductively coupled plasma mass spectrometry (LA-ICP-MS). The OSL results suggest an age of approximately 3.59 ± 0.34 ka, placing the artifacts in the Late Neolithic to Middle–Late Bronze Age. These findings are consistent with the typological characteristics of the ceramics and align with radiocarbon (C-14) dates obtained from charcoal collected from black-burnished earthenware vessels at the Ban Kao site, which also fall within the Late Neolithic period. This correlation supports the chronological framework of prehistoric settlement in the region and highlights the reliability of OSL dating for ceramic artifacts in tropical archaeological contexts.
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