10:45 AM - 11:08 AM
[SGL21-01] Contribution of radiocarbon dating to high-precision paleoenvironmental reconstruction
★Invited Papers
Keywords:Radiocarbon dating, Paleoenvironmental reconstruction, Radiocarbon calibration, Radiocarbon wiggle-matching, Annual ring
Radiocarbon (14C) dating is used to determine the activity history of volcanic eruptions and active faults, and to determine the sedimentary age of peat and alluvial layers. Radiocarbon calibration is essential process, and efforts are being made to improve chronological precision and accuracy. Dating results are also applied to the distribution of archaeological sites and the diffusion of human beings and technology based on them. However, sediments, which are recording media for various events, do not always record stably. Accurate dating also plays an important role in evaluating the stability of such recording devices. For example, there are cases in which sedimentation interruptions (hiatus) are observed in seemingly continuous sediments. In this talk, I would like to introduce such cases in the Aleutian Islands and the Cook Islands. In radiocarbon calibration, tree rings and varve sediments contribute to the establishment of calibration curves such as IntCal. Although IntCal assumes that the 14C concentration in the northern hemisphere is uniform, this may not always be the case. As an example, 14C wiggle-matching of annual rings such as Haruna volcano Hr-FP will be discussed.