Relations between sedimentary sequence and paleoclimatic changes during last 200 ka in the southern South China Sea

Core NS-93-5 was taken from the mild slope terrace of the southern South Ch ina Sea (SCS), which has preserved the steadiness depositional record of th e normal marine environment since late Quaternary. Sedimentary sequence and oxygen isotopic stratigraphy of high resolution in the near 200 ka of the southern SCS has been established. By the comparative analysis with GISP2's ice core, the depositional record of D/O's events 1-21 and Heinrich's even ts H1-H6 in the southern SCS that reflected the quick climate change in sho rt time scale since the last interglacial stage is revealed, which indicate s that in the last 200 ka in the southern SCS and the Arctic area there was tele-connection of paleoclimate and the unstability of the Western Pacific Warm Pool. This note shows that the sedimentary layers order of this sea a rea classified by color identification and by oxygen isotope stratum has th e very good corresponding relation. The color feature of sediment changes a long with the climate and the former arranges a stagnant time of 1-1.5 ka g enerally. It was suggested that the paleoclimatic changes resulted in the r ise and fall of sea level, the open and close of strait thoroughfare and th e upwelling activity, which causes the changes of the oxidation-reduction c ondition of deep water along with the dynamic environment in this sea area, thus producing the different sediment features of sea bed. In addition, a volcanic ash layer, about 17 cm thick, has been found in the transition of oxygen isotope 4/5 stage, which is related wit the Toba's volcanic eruption .