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International Conference on Climate Change Global Warming

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Radionuclide Activities, Geochemistry, and Accumulation Rates of Sediments in the Gulf of Thailand

Author(s): Srisuksawad K, Porntepkasemsan B, Nouchpramool S, Yamkate P, Carpenter R, et al.

Abstract

Downcore concentration profiles of 210Pb, U, and Th isotopes, Al, Fe, Ti, Mn and Sc were measured in sediment box cores collected at 22 stations (16–70 m water depth) covering most of the Thai zone of the Gulf of Thailand. Distributions of excess 210Pb and the detrital elements were used to study spatial variations in sedimentary processes, mineralogy, and geochemistry between different regions of the gulf. Steady-state depositional concentrations and fluxes of excess 210Pb are 3–10 times lower in Gulf of Thailand sediments than in sediments from mid-latitudes in the northern hemisphere, reflecting lower 210Pb inputs from atmospheric fallout at 6–13°N latitude and from lower production of 210Pb from 226Ra in the shallower waters of the Gulf.

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