11:15 AM - 11:35 AM
★ [MIS28-02] Precise age determination of the marginal sea sediments recovered by IODP Expedition 346 "Asian Monsoon"
Keywords:Integrated Ocean Drilling Program, Expedition 346, East Asian monsoon, Dansgaard-Oeschger Cycle
Time relationship between the dark layer deposition in the marginal sea and well-dated paleoclimate records is also a key to understand the climate system in terms of the cause-and-effect relationship. In order to investigate this, we propose to construct precise age model by correlating marine sediment off the Wakasa Bay and the varve sediment of Lake Suigetsu using tephra layers as well as invisible "micro tephra" preserved in both sediments. Recently, macrofossil radiocarbon data from the varve sediment of Lake Suigetsu is adopted into the calibration curve IntCal13. Therefore, the correlation between marine and Suigetsu sediments will allow us to investigate time relationship of the dark layer deposition with Dansgaard-Oeschger cycles.