Natural and artificial radionuclides and organic geochemistry data of sediment core GeoB17409-1
Abstract
Radionuclide concentrations were studied in a sediment core GeoB17409-1 taken at the continental slope of the Philippine Sea off Mindanao Island in the equatorial Western Pacific. High resolution deposition records of anthropogenic radionuclides were collected at this site. Excess 210Pb together with excess 228Th and anthropogenic radionuclides provided information about accumulation rates. Concentrations of Am and Pu isotopes were detected by gamma spectrometry, alpha spectrometry and ICP-MS. The Pu ratios indicate a high portion (minimum of 60%) of Pu from the Pacific Proving Grounds (PPG). This implies that the transport of PPG derived plutonium with the Mindanao Current southward is similarly effective as the previously known transport towards the north with the Kuroshio Current. The record is compared to other studies from northwest Pacific marginal seas and Lombok basin in the Indonesian Archipelago. The sediment core top was found to contain a 6 cm thick layer dominated by terrestrial organic matter, which was interpreted as a result of the 2012 Typhoon Pablo-related fast deposition- Dataset
- 2 member mixing model; Actinium-228; Age; Age, uncertainty; Alpha spectrometry; Americium-241; Americium-241/Caesium-137 ratio; Americium-241 decision threshold; Caesium-137; Caesium-137, decision threshold; Carbon, organic, total; Carbon, organic, total, standard deviation; Center for Marine Environmental Sciences; CF-CS model (2 sections); Cumulative mass; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EISPAC/WESTWIND; Fraction; Gamma-ray spectrometry; GeoB17409-1; ICP-MS; Lead-210 activity per mass; Lead-210 excess; Lead-212; Lead-214 activity per mass; MARUM; MUC; MultiCorer; Plutonium-238; Plutonium-238/(Plutonium-239+240) activity ratio; Plutonium-239+240; Plutonium-240/Plutonium-239, atomic ratio; Potassium-40; SO228; Sonne; Thallium-208; Thorium-228 excess; Uncertainty; Water content, relative; δ13C, organic carbon; δ13C, organic carbon, standard error