Holocene Geomorphic Evolution of Back Sand Beach, Laem Ngop District in Trat Province
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Abstract
The development of coastal beaches is linked to climatic changes and sea-level fluctuations. Therefore, understanding the beach deposition processes is essential for predicting how coastal landscapes may react to future climatic and sea-level variability. However, at present, a high-resolution chronology is still limited which hinders the detailed interpretation of depositional history of coastal beaches. In this study, thermoluminescence dating was applied to establish the depositional history of the goethite-coated quartz sands in the Black Sand Beach in the Lower Gulf of Thailand. A multiple-aliquot regenerative-dose procedure was used to estimate equivalent doses of quartz grains extracted from the samples, whereas annual doses were obtained by determining concentrations of 238U, 232Th, and 40K in the samples. Detailed thermoluminescence ages reveal that five samples collected from two excavation pits on the Black Sand Beach at Laem Ngop District in Trat Province produced ages ranging from 9,069 ± 590 a to present. This study also found variations in sediment deposition rates with a period of non-deposition, which are 0.01 mm/a during 9,069 ± 590 to 1,405 ± 85 a, and 0.14 mm/a during 1,405 ± 85 a to present. It is concluded that deposition of the beach started in the Early Holocene and coincides with a regional marine transgression.
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