ESR dating of laterite from Ban Tha Ta Suea, Kanchanaburi, Thailand
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Publication Details
Author list: Limsuwan S., Vichaidid T., Limsuwan P.
Publication year: 2011
Volume number: 69
Issue number: 2
Start page: 545
End page: 549
Number of pages: 5
ISSN: 0969-8043
eISSN: 0969-8043
Languages: English-Great Britain (EN-GB)
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Abstract
Electron spin resonance (ESR) dating was carried out on laterite samples collected from Ban Tha Ta Suea, the original deposit of the laterite used in the construction of Muang Sing Historical Park. Ban Tha Ta Suea is about 6km east of Muang Sing Historical Park in Kanchanaburi province (181km far from Bangkok). The dose response of the g=2.0028 ESR signal was found to be suitable for age determination. An exponential saturation function was fitted to the ESR signal growth on additional γ-irradiation. Extrapolation of this function resulted in the accumulated dose 144±5Gy. Gamma spectroscopy and neutron activation analysis (NAA) were used to determine concentrations of 238U, 232Th and 40K in the samples from which the annual dose rate 16±2mGy was calculated. In addition, the dose rate of cosmic rays was taken into account. The ESR age of laterite samples was found to be 9.0±0.9ka. This age falls within the Holocene epoch of the Quaternary on the geological time scale. Samples from Muang Sing Historical Park were assigned to the same epoch. Both results agree with the geological map. © 2010 Elsevier Ltd.
Keywords
Ban Tha Ta Suea, ESR dating, Holocene, Laterite, Muang Sing Historical Park
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