鉛-210堆積年代測定法とその問題点

概要

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Lead-210 is one of the natural radionuclides belonging to the uranium series and has a halflife of 22.3 y. It has been used to measure sedimentation rates of lake and marine sediments. The calculations of ages are achieved on the basis of CRS model or CIC model depending on the source of Pb-210 fluxes. Surface sediments are disturbed and mixed by biological (bioturbation) and physical turbulence, and this process is incorporated into the model as a diffusion equation. The sedimentation process and mixing process cannot be distinguished by Pb-210 profiles, so much attention should be paid to the observation of cores. The profiles of other nuclides, anthropogenic elements and organics would help better understanding. Computers are often used for calculations and effective models are required for the estimation of the ancient sedimentary environment.
日本地球化学会の論文
2000-03-03