Reconstruction of sea level changes in Changwat Pattalung

Abstract

Sea level changes, one of paleoenvironment data, can be reconstructed from lake sediment data. Since Thale Noi, a freshwater lake in Changwat Phatthalung, Eastern of Thai-Malay Peninsula, have been influenced by the sea, core TLN-CP5 from Thale Noi was analyzed to reconstruct a sea level changes model by examined the sedimentology using the physical property of the core, loss on ignition analysis, and particle size analysis, and an age-depth model from AMS 14C dating using BACON program. The geochronology data indicates that the sea level was very high and was covering the area. The sea level was expected to be falling until 8145 – 7979 cal BP. Then, there was a transgression until 7280 – 6958 cal BP. From palynological data, it suggests that the sea level should remained stable between 7980 – 7787 cal BP and 7280 – 6958 cal BP. Finally, since 7280 – 6958 cal BP, there is, again, a regression until present. In addition, palynological data indicates that there also should had a freshwater run-off into the lake since the environment shifted from a mangrove to a freshwater swamp.